.sqlx/query-3c82b22884858afc80ab013abddc072c816f5ea94eac454406f5eaa3129dd180.json

@@ -0,0 +1,23 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "INSERT INTO cqrs_inventory_product_query (\n                        version,\n                        name,\n                        description,\n                        image,\n                        product_id,\n                        category_id,\n                        price_major,\n                        price_minor,\n                        price_currency,\n                        sku_able\n                    ) VALUES (\n                        $1, $2, $3, $4, $5, $6, $7, $8, $9, $10\n                    );",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Left": [
+        "Int8",
+        "Text",
+        "Text",
+        "Text",
+        "Uuid",
+        "Uuid",
+        "Int4",
+        "Int4",
+        "Text",
+        "Bool"
+      ]
+    },
+    "nullable": []
+  },
+  "hash": "3c82b22884858afc80ab013abddc072c816f5ea94eac454406f5eaa3129dd180"
+}

.sqlx/query-4389b997a21aa5184102aaf7c90fc527776e7a753b12bf7035904dedde904aae.json

@@ -0,0 +1,70 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "SELECT \n                name,\n                description,\n                image,\n                product_id,\n                category_id,\n                price_major,\n                price_minor,\n                price_currency,\n                sku_able\n             FROM\n                cqrs_inventory_product_query\n            WHERE\n                product_id = $1;",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "name",
+        "type_info": "Text"
+      },
+      {
+        "ordinal": 1,
+        "name": "description",
+        "type_info": "Text"
+      },
+      {
+        "ordinal": 2,
+        "name": "image",
+        "type_info": "Text"
+      },
+      {
+        "ordinal": 3,
+        "name": "product_id",
+        "type_info": "Uuid"
+      },
+      {
+        "ordinal": 4,
+        "name": "category_id",
+        "type_info": "Uuid"
+      },
+      {
+        "ordinal": 5,
+        "name": "price_major",
+        "type_info": "Int4"
+      },
+      {
+        "ordinal": 6,
+        "name": "price_minor",
+        "type_info": "Int4"
+      },
+      {
+        "ordinal": 7,
+        "name": "price_currency",
+        "type_info": "Text"
+      },
+      {
+        "ordinal": 8,
+        "name": "sku_able",
+        "type_info": "Bool"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "Uuid"
+      ]
+    },
+    "nullable": [
+      false,
+      true,
+      true,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false
+    ]
+  },
+  "hash": "4389b997a21aa5184102aaf7c90fc527776e7a753b12bf7035904dedde904aae"
+}

.sqlx/query-4d3524bb1742ba55267ab53322cf6c6942d6fc4057b65327f8c6d79ef21cc064.json

@@ -0,0 +1,23 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "UPDATE\n                        cqrs_inventory_product_query\n                    SET\n                        version = $1,\n                        name = $2,\n                        description = $3,\n                        image = $4,\n                        product_id = $5,\n                        category_id = $6,\n                        price_major = $7,\n                        price_minor = $8,\n                        price_currency = $9,\n                        sku_able = $10;",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Left": [
+        "Int8",
+        "Text",
+        "Text",
+        "Text",
+        "Uuid",
+        "Uuid",
+        "Int4",
+        "Int4",
+        "Text",
+        "Bool"
+      ]
+    },
+    "nullable": []
+  },
+  "hash": "4d3524bb1742ba55267ab53322cf6c6942d6fc4057b65327f8c6d79ef21cc064"
+}

.sqlx/query-53a5e7e87387ffc14013067a24c80b9d14c9864875177af5320c926d68cfb4ae.json

@@ -0,0 +1,23 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "SELECT EXISTS (\n                SELECT 1\n                    FROM cqrs_inventory_product_query\n                WHERE\n                    name = $1\n                AND\n                    category_id = $2\n            );",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "exists",
+        "type_info": "Bool"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "Text",
+        "Uuid"
+      ]
+    },
+    "nullable": [
+      null
+    ]
+  },
+  "hash": "53a5e7e87387ffc14013067a24c80b9d14c9864875177af5320c926d68cfb4ae"
+}

.sqlx/query-e20284d3953f5cba62c63b3a9482cea0739c072a7d83ce29ded99342d203766f.json

@@ -0,0 +1,22 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "SELECT EXISTS (\n                SELECT 1\n                    FROM cqrs_inventory_product_query\n                WHERE\n                    product_id = $1\n            );",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "exists",
+        "type_info": "Bool"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "Uuid"
+      ]
+    },
+    "nullable": [
+      null
+    ]
+  },
+  "hash": "e20284d3953f5cba62c63b3a9482cea0739c072a7d83ce29ded99342d203766f"
+}

.sqlx/query-fbd8fa5a39f6c5351e7e366ad385c02cfe11dbee292fc0cb80a01228a3cceb93.json

@@ -0,0 +1,28 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "SELECT \n                product_id, version\n             FROM\n                cqrs_inventory_product_query\n            WHERE\n                product_id = $1;",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "product_id",
+        "type_info": "Uuid"
+      },
+      {
+        "ordinal": 1,
+        "name": "version",
+        "type_info": "Int8"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "Uuid"
+      ]
+    },
+    "nullable": [
+      false,
+      false
+    ]
+  },
+  "hash": "fbd8fa5a39f6c5351e7e366ad385c02cfe11dbee292fc0cb80a01228a3cceb93"
+}

migrations/20240715113708_cqrs_inventory_product_query.sql

@@ -0,0 +1,27 @@
+-- SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+--
+-- SPDX-License-Identifier: AGPL-3.0-or-later
+
+CREATE TABLE IF NOT EXISTS cqrs_inventory_product_query
+(
+    version           bigint CHECK (version >= 0) NOT NULL,
+
+	name TEXT NOT NULL,
+	description TEXT,
+	image TEXT,
+	sku_able BOOLEAN NOT NULL DEFAULT FALSE,
+	product_id UUID NOT NULL UNIQUE,
+
+
+    price_minor INTEGER NOT NULL,
+    price_major INTEGER NOT NULL,
+    price_currency TEXT NOT NULL,
+
+
+	category_id UUID NOT NULL,
+
+	deleted BOOLEAN NOT NULL DEFAULT FALSE,
+    UNIQUE(category_id, name),
+
+    PRIMARY KEY (product_id)
+);

src/inventory/adapters/output/db/postgres/errors.rs

@@ -17,6 +17,14 @@ impl From<SqlxError> for InventoryDBError {
                 let msg = err.message();
                 if msg.contains("cqrs_inventory_store_query_store_id_key") {
                     return Self::DuplicateStoreID;
+                } else if msg.contains("cqrs_inventory_store_query_product_id_key") {
+                    return Self::DuplicateProductID;
+                } else if msg.contains("cqrs_inventory_store_query_category_id_key") {
+                    return Self::DuplicateCategoryID;
+                } else if msg.contains("cqrs_inventory_product_query_name_key") {
+                    return Self::DuplicateProductName;
+                } else if msg.contains("cqrs_inventory_category_query_name_key") {
+                    return Self::DuplicateProductName;
                 } else if msg.contains("cqrs_inventory_store_query_name_key") {
                     return Self::DuplicateStoreName;
                 } else {

src/inventory/adapters/output/db/postgres/mod.rs

@@ -12,6 +12,9 @@ mod category_id_exists;
 mod category_name_exists_for_store;
 mod category_view;
 mod errors;
+mod product_id_exists;
+mod product_name_exists_for_category;
+mod product_view;
 mod store_id_exists;
 mod store_name_exists;
 mod store_view;

src/inventory/adapters/output/db/postgres/product_id_exists.rs

@@ -0,0 +1,103 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+use uuid::Uuid;
+
+use super::InventoryDBPostgresAdapter;
+use crate::inventory::application::port::output::db::{errors::*, product_id_exists::*};
+
+#[async_trait::async_trait]
+impl ProductIDExistsDBPort for InventoryDBPostgresAdapter {
+    async fn product_id_exists(&self, product_id: &Uuid) -> InventoryDBResult<bool> {
+        let res = sqlx::query!(
+            "SELECT EXISTS (
+                SELECT 1
+                    FROM cqrs_inventory_product_query
+                WHERE
+                    product_id = $1
+            );",
+            product_id
+        )
+        .fetch_one(&self.pool)
+        .await?;
+        if let Some(x) = res.exists {
+            Ok(x)
+        } else {
+            Ok(false)
+        }
+    }
+}
+
+#[cfg(test)]
+pub mod tests {
+
+    use super::*;
+    use crate::inventory::domain::{add_product_command::tests::get_command, product_aggregate::*};
+    use crate::utils::uuid::tests::UUID;
+
+    #[actix_rt::test]
+    async fn test_postgres_product_exists() {
+        let settings = crate::settings::tests::get_settings().await;
+        settings.create_db().await;
+        let db = super::InventoryDBPostgresAdapter::new(
+            sqlx::postgres::PgPool::connect(&settings.database.url)
+                .await
+                .unwrap(),
+        );
+
+        let cmd = get_command();
+
+        let product = ProductBuilder::default()
+            .name(cmd.name().into())
+            .description(cmd.description().as_ref().map(|s| s.to_string()))
+            .image(cmd.image().as_ref().map(|s| s.to_string()))
+            .sku_able(cmd.sku_able().clone())
+            .category_id(cmd.category_id().clone())
+            .product_id(UUID.clone())
+            .price(cmd.price().clone())
+            .build()
+            .unwrap();
+
+        // state doesn't exist
+        assert!(!db.product_id_exists(product.product_id()).await.unwrap());
+
+        create_dummy_product_record(&product, &db).await;
+
+        // state exists
+        assert!(db.product_id_exists(product.product_id()).await.unwrap());
+
+        settings.drop_db().await;
+    }
+
+    pub async fn create_dummy_product_record(p: &Product, db: &InventoryDBPostgresAdapter) {
+        sqlx::query!(
+            "INSERT INTO cqrs_inventory_product_query (
+                    version,
+                    name,
+                    description,
+                    image,
+                    product_id,
+                    category_id,
+                    price_major,
+                    price_minor,
+                    price_currency,
+                    sku_able
+                ) VALUES (
+                    $1, $2, $3, $4, $5, $6, $7, $8, $9, $10
+                );",
+            1,
+            p.name(),
+            p.description().as_ref().unwrap(),
+            p.image().as_ref().unwrap(),
+            p.product_id(),
+            p.category_id(),
+            p.price().major().clone() as i32,
+            p.price().minor().clone() as i32,
+            p.price().currency().to_string(),
+            p.sku_able().clone()
+        )
+        .execute(&db.pool)
+        .await
+        .unwrap();
+    }
+}

src/inventory/adapters/output/db/postgres/product_name_exists_for_category.rs

@@ -0,0 +1,78 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use super::InventoryDBPostgresAdapter;
+use crate::inventory::application::port::output::db::{
+    errors::*, product_name_exists_for_category::*,
+};
+use crate::inventory::domain::product_aggregate::*;
+
+#[async_trait::async_trait]
+impl ProductNameExistsForCategoryDBPort for InventoryDBPostgresAdapter {
+    async fn product_name_exists_for_category(&self, s: &Product) -> InventoryDBResult<bool> {
+        let res = sqlx::query!(
+            "SELECT EXISTS (
+                SELECT 1
+                    FROM cqrs_inventory_product_query
+                WHERE
+                    name = $1
+                AND
+                    category_id = $2
+            );",
+            s.name(),
+            s.category_id(),
+        )
+        .fetch_one(&self.pool)
+        .await?;
+        if let Some(x) = res.exists {
+            Ok(x)
+        } else {
+            Ok(false)
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::inventory::adapters::output::db::postgres::product_id_exists::tests::create_dummy_product_record;
+    use crate::inventory::domain::add_product_command::tests::get_command;
+    use crate::utils::uuid::tests::UUID;
+
+    #[actix_rt::test]
+    async fn test_postgres_product_exists() {
+        let product_name = "foo_product";
+
+        let settings = crate::settings::tests::get_settings().await;
+        settings.create_db().await;
+        let db = super::InventoryDBPostgresAdapter::new(
+            sqlx::postgres::PgPool::connect(&settings.database.url)
+                .await
+                .unwrap(),
+        );
+
+        let cmd = get_command();
+
+        let product = ProductBuilder::default()
+            .name(product_name.into())
+            .description(cmd.description().as_ref().map(|s| s.to_string()))
+            .image(cmd.image().as_ref().map(|s| s.to_string()))
+            .sku_able(cmd.sku_able().clone())
+            .category_id(cmd.category_id().clone())
+            .product_id(UUID.clone())
+            .price(cmd.price().clone())
+            .build()
+            .unwrap();
+
+        // state doesn't exist
+        assert!(!db.product_name_exists_for_category(&product).await.unwrap());
+
+        create_dummy_product_record(&product, &db).await;
+
+        // state exists
+        assert!(db.product_name_exists_for_category(&product).await.unwrap());
+
+        settings.drop_db().await;
+    }
+}

src/inventory/adapters/output/db/postgres/product_view.rs

@@ -0,0 +1,265 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use std::str::FromStr;
+
+use async_trait::async_trait;
+use cqrs_es::persist::{PersistenceError, ViewContext, ViewRepository};
+use cqrs_es::{EventEnvelope, Query, View};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use super::errors::*;
+use super::InventoryDBPostgresAdapter;
+use crate::inventory::domain::events::InventoryEvent;
+use crate::inventory::domain::product_aggregate::{
+    Currency, PriceBuilder, Product, ProductBuilder,
+};
+use crate::utils::parse_aggregate_id::parse_aggregate_id;
+
+pub const NEW_PRODUCT_NON_UUID: &str = "new_product_non_uuid-asdfa";
+
+// The view for a Product query, for a standard http application this should
+// be designed to reflect the response dto that will be returned to a user.
+#[derive(Debug, Default, Serialize, Deserialize)]
+pub struct ProductView {
+    name: String,
+    description: Option<String>,
+    image: Option<String>, // string = filename
+    product_id: Uuid,
+    sku_able: bool,
+
+    price_minor: i32,
+    price_major: i32,
+    price_currency: String,
+
+    category_id: Uuid,
+}
+
+impl From<ProductView> for Product {
+    fn from(v: ProductView) -> Self {
+        let price = PriceBuilder::default()
+            .minor(v.price_minor as usize)
+            .major(v.price_major as usize)
+            .currency(Currency::from_str(&v.price_currency).unwrap())
+            .build()
+            .unwrap();
+
+        ProductBuilder::default()
+            .name(v.name)
+            .description(v.description)
+            .image(v.image)
+            .sku_able(v.sku_able)
+            .price(price)
+            .category_id(v.category_id)
+            .product_id(v.product_id)
+            .build()
+            .unwrap()
+    }
+}
+
+// This updates the view with events as they are committed.
+// The logic should be minimal here, e.g., don't calculate the account balance,
+// design the events to carry the balance information instead.
+impl View<Product> for ProductView {
+    fn update(&mut self, event: &EventEnvelope<Product>) {
+        match &event.payload {
+            InventoryEvent::ProductAdded(val) => {
+                self.name = val.name().into();
+                self.description = val.description().clone();
+                self.image = val.image().clone();
+                self.product_id = val.product_id().clone();
+                self.category_id = val.category_id().clone();
+
+                self.sku_able = val.sku_able().clone();
+
+                self.price_minor = val.price().minor().clone() as i32;
+                self.price_major = val.price().major().clone() as i32;
+                self.price_currency = val.price().currency().to_string();
+            }
+            _ => (),
+        }
+    }
+}
+
+#[async_trait]
+impl ViewRepository<ProductView, Product> for InventoryDBPostgresAdapter {
+    async fn load(&self, product_id: &str) -> Result<Option<ProductView>, PersistenceError> {
+        let product_id = match parse_aggregate_id(product_id, NEW_PRODUCT_NON_UUID)? {
+            Some((val, _)) => return Ok(Some(val)),
+            None => Uuid::parse_str(product_id).unwrap(),
+        };
+
+        let res = sqlx::query_as!(
+            ProductView,
+            "SELECT 
+                name,
+                description,
+                image,
+                product_id,
+                category_id,
+                price_major,
+                price_minor,
+                price_currency,
+                sku_able
+             FROM
+                cqrs_inventory_product_query
+            WHERE
+                product_id = $1;",
+            product_id
+        )
+        .fetch_one(&self.pool)
+        .await
+        .map_err(PostgresAggregateError::from)?;
+        Ok(Some(res))
+    }
+
+    async fn load_with_context(
+        &self,
+        product_id: &str,
+    ) -> Result<Option<(ProductView, ViewContext)>, PersistenceError> {
+        let product_id = match parse_aggregate_id(product_id, NEW_PRODUCT_NON_UUID)? {
+            Some(val) => return Ok(Some(val)),
+            None => Uuid::parse_str(product_id).unwrap(),
+        };
+
+        let res = sqlx::query_as!(
+            ProductView,
+            "SELECT 
+                name,
+                description,
+                image,
+                product_id,
+                category_id,
+                price_major,
+                price_minor,
+                price_currency,
+                sku_able
+             FROM
+                cqrs_inventory_product_query
+            WHERE
+                product_id = $1;",
+            product_id
+        )
+        .fetch_one(&self.pool)
+        .await
+        .map_err(PostgresAggregateError::from)?;
+
+        struct Context {
+            version: i64,
+            product_id: Uuid,
+        }
+
+        let ctx = sqlx::query_as!(
+            Context,
+            "SELECT 
+                product_id, version
+             FROM
+                cqrs_inventory_product_query
+            WHERE
+                product_id = $1;",
+            product_id
+        )
+        .fetch_one(&self.pool)
+        .await
+        .map_err(PostgresAggregateError::from)?;
+
+        let view_context = ViewContext::new(ctx.product_id.to_string(), ctx.version);
+        Ok(Some((res, view_context)))
+    }
+
+    async fn update_view(
+        &self,
+        view: ProductView,
+        context: ViewContext,
+    ) -> Result<(), PersistenceError> {
+        match context.version {
+            0 => {
+                let version = context.version + 1;
+                sqlx::query!(
+                    "INSERT INTO cqrs_inventory_product_query (
+                        version,
+                        name,
+                        description,
+                        image,
+                        product_id,
+                        category_id,
+                        price_major,
+                        price_minor,
+                        price_currency,
+                        sku_able
+                    ) VALUES (
+                        $1, $2, $3, $4, $5, $6, $7, $8, $9, $10
+                    );",
+                    version,
+                    view.name,
+                    view.description,
+                    view.image,
+                    view.product_id,
+                    view.category_id,
+                    view.price_major,
+                    view.price_minor,
+                    view.price_currency,
+                    view.sku_able
+                )
+                .execute(&self.pool)
+                .await
+                .map_err(PostgresAggregateError::from)?;
+            }
+            _ => {
+                let version = context.version + 1;
+                sqlx::query!(
+                    "UPDATE
+                        cqrs_inventory_product_query
+                    SET
+                        version = $1,
+                        name = $2,
+                        description = $3,
+                        image = $4,
+                        product_id = $5,
+                        category_id = $6,
+                        price_major = $7,
+                        price_minor = $8,
+                        price_currency = $9,
+                        sku_able = $10;",
+                    version,
+                    view.name,
+                    view.description,
+                    view.image,
+                    view.product_id,
+                    view.category_id,
+                    view.price_major,
+                    view.price_minor,
+                    view.price_currency,
+                    view.sku_able
+                )
+                .execute(&self.pool)
+                .await
+                .map_err(PostgresAggregateError::from)?;
+            }
+        }
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl Query<Product> for InventoryDBPostgresAdapter {
+    async fn dispatch(&self, product_id: &str, events: &[EventEnvelope<Product>]) {
+        let res = self
+            .load_with_context(&product_id)
+            .await
+            .unwrap_or_else(|_| {
+                Some((
+                    ProductView::default(),
+                    ViewContext::new(product_id.into(), 0),
+                ))
+            });
+        let (mut view, view_context): (ProductView, ViewContext) = res.unwrap();
+        for event in events {
+            view.update(event);
+        }
+        self.update_view(view, view_context).await.unwrap();
+    }
+}

src/inventory/adapters/output/db/postgres/store_view.rs

@@ -210,11 +210,12 @@ mod tests {
         inventory::{
             application::services::{
                 add_category_service::tests::mock_add_category_service,
+                add_product_service::tests::mock_add_product_service,
                 add_store_service::AddStoreServiceBuilder, InventoryServicesBuilder,
             },
             domain::{
-                add_category_command::AddCategoryCommand, add_store_command::AddStoreCommand,
-                commands::InventoryCommand,
+                add_category_command::AddCategoryCommand, add_product_command::tests::get_command,
+                add_store_command::AddStoreCommand, commands::InventoryCommand,
             },
         },
         tests::bdd::IS_NEVER_CALLED,
@@ -250,6 +251,7 @@ mod tests {
                 IS_NEVER_CALLED,
                 AddCategoryCommand::new("foo".into(), None, UUID.clone(), UUID.clone()).unwrap(),
             ))
+            .add_product(mock_add_product_service(IS_NEVER_CALLED, get_command()))
             .build()
             .unwrap();
 

src/inventory/application/port/output/db/errors.rs

@@ -10,7 +10,10 @@ pub type InventoryDBResult<V> = Result<V, InventoryDBError>;
 #[derive(Debug, Display, Clone, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
 pub enum InventoryDBError {
     DuplicateCategoryName,
+    DuplicateCategoryID,
     DuplicateStoreName,
     DuplicateStoreID,
+    DuplicateProductName,
+    DuplicateProductID,
     InternalError,
 }

src/inventory/application/port/output/db/mod.rs

@@ -5,5 +5,7 @@
 pub mod category_id_exists;
 pub mod category_name_exists_for_store;
 pub mod errors;
+pub mod product_id_exists;
+pub mod product_name_exists_for_category;
 pub mod store_id_exists;
 pub mod store_name_exists;

src/inventory/application/port/output/db/product_id_exists.rs

@@ -0,0 +1,53 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use mockall::predicate::*;
+use mockall::*;
+use uuid::Uuid;
+
+use super::errors::*;
+#[cfg(test)]
+#[allow(unused_imports)]
+pub use tests::*;
+
+#[automock]
+#[async_trait::async_trait]
+pub trait ProductIDExistsDBPort: Send + Sync {
+    async fn product_id_exists(&self, c: &Uuid) -> InventoryDBResult<bool>;
+}
+
+pub type ProductIDExistsDBPortObj = std::sync::Arc<dyn ProductIDExistsDBPort>;
+
+#[cfg(test)]
+pub mod tests {
+    use super::*;
+
+    use std::sync::Arc;
+
+    pub fn mock_product_id_exists_db_port_false(times: Option<usize>) -> ProductIDExistsDBPortObj {
+        let mut m = MockProductIDExistsDBPort::new();
+        if let Some(times) = times {
+            m.expect_product_id_exists()
+                .times(times)
+                .returning(|_| Ok(false));
+        } else {
+            m.expect_product_id_exists().returning(|_| Ok(false));
+        }
+
+        Arc::new(m)
+    }
+
+    pub fn mock_product_id_exists_db_port_true(times: Option<usize>) -> ProductIDExistsDBPortObj {
+        let mut m = MockProductIDExistsDBPort::new();
+        if let Some(times) = times {
+            m.expect_product_id_exists()
+                .times(times)
+                .returning(|_| Ok(true));
+        } else {
+            m.expect_product_id_exists().returning(|_| Ok(true));
+        }
+
+        Arc::new(m)
+    }
+}

src/inventory/application/port/output/db/product_name_exists_for_category.rs

@@ -0,0 +1,61 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use mockall::predicate::*;
+use mockall::*;
+
+use crate::inventory::domain::product_aggregate::Product;
+
+use super::errors::*;
+#[cfg(test)]
+#[allow(unused_imports)]
+pub use tests::*;
+
+#[automock]
+#[async_trait::async_trait]
+pub trait ProductNameExistsForCategoryDBPort: Send + Sync {
+    async fn product_name_exists_for_category(&self, c: &Product) -> InventoryDBResult<bool>;
+}
+
+pub type ProductNameExistsForCategoryDBPortObj =
+    std::sync::Arc<dyn ProductNameExistsForCategoryDBPort>;
+
+#[cfg(test)]
+pub mod tests {
+    use super::*;
+
+    use std::sync::Arc;
+
+    pub fn mock_product_name_exists_for_category_db_port_false(
+        times: Option<usize>,
+    ) -> ProductNameExistsForCategoryDBPortObj {
+        let mut m = MockProductNameExistsForCategoryDBPort::new();
+        if let Some(times) = times {
+            m.expect_product_name_exists_for_category()
+                .times(times)
+                .returning(|_| Ok(false));
+        } else {
+            m.expect_product_name_exists_for_category()
+                .returning(|_| Ok(false));
+        }
+
+        Arc::new(m)
+    }
+
+    pub fn mock_product_name_exists_for_category_db_port_true(
+        times: Option<usize>,
+    ) -> ProductNameExistsForCategoryDBPortObj {
+        let mut m = MockProductNameExistsForCategoryDBPort::new();
+        if let Some(times) = times {
+            m.expect_product_name_exists_for_category()
+                .times(times)
+                .returning(|_| Ok(true));
+        } else {
+            m.expect_product_name_exists_for_category()
+                .returning(|_| Ok(true));
+        }
+
+        Arc::new(m)
+    }
+}

src/inventory/application/services/add_product_service.rs

@@ -0,0 +1,169 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use std::sync::Arc;
+
+use derive_builder::Builder;
+use mockall::predicate::*;
+use mockall::*;
+
+use super::errors::*;
+use crate::inventory::{
+    application::port::output::db::{product_id_exists::*, product_name_exists_for_category::*},
+    domain::{
+        add_product_command::AddProductCommand,
+        product_added_event::{ProductAddedEvent, ProductAddedEventBuilder},
+        product_aggregate::*,
+    },
+};
+use crate::utils::uuid::*;
+
+#[automock]
+#[async_trait::async_trait]
+pub trait AddProductUseCase: Send + Sync {
+    async fn add_product(&self, cmd: AddProductCommand) -> InventoryResult<ProductAddedEvent>;
+}
+
+pub type AddProductServiceObj = Arc<dyn AddProductUseCase>;
+
+#[derive(Clone, Builder)]
+pub struct AddProductService {
+    db_product_name_exists_for_category: ProductNameExistsForCategoryDBPortObj,
+    db_product_id_exists: ProductIDExistsDBPortObj,
+    get_uuid: GetUUIDInterfaceObj,
+}
+
+#[async_trait::async_trait]
+impl AddProductUseCase for AddProductService {
+    async fn add_product(&self, cmd: AddProductCommand) -> InventoryResult<ProductAddedEvent> {
+        let mut product_id = self.get_uuid.get_uuid();
+
+        loop {
+            if self
+                .db_product_id_exists
+                .product_id_exists(&product_id)
+                .await?
+            {
+                product_id = self.get_uuid.get_uuid();
+                continue;
+            } else {
+                break;
+            }
+        }
+
+        let product = ProductBuilder::default()
+            .name(cmd.name().into())
+            .description(cmd.description().as_ref().map(|s| s.to_string()))
+            .image(cmd.image().clone())
+            .sku_able(cmd.sku_able().clone())
+            .price(cmd.price().clone())
+            .category_id(cmd.category_id().clone())
+            .product_id(product_id)
+            .build()
+            .unwrap();
+
+        if self
+            .db_product_name_exists_for_category
+            .product_name_exists_for_category(&product)
+            .await?
+        {
+            return Err(InventoryError::DuplicateProductName);
+        }
+
+        Ok(ProductAddedEventBuilder::default()
+            .added_by_user(cmd.adding_by().clone())
+            .name(product.name().into())
+            .description(product.description().as_ref().map(|s| s.to_string()))
+            .image(product.image().clone())
+            .sku_able(product.sku_able().clone())
+            .price(product.price().clone())
+            .category_id(product.category_id().clone())
+            .product_id(product.product_id().clone())
+            .build()
+            .unwrap())
+    }
+}
+
+#[cfg(test)]
+pub mod tests {
+    use super::*;
+
+    use uuid::Uuid;
+
+    use crate::inventory::domain::add_product_command::tests::get_command;
+    use crate::utils::uuid::tests::UUID;
+    use crate::{tests::bdd::*, utils::uuid::tests::mock_get_uuid};
+
+    pub fn mock_add_product_service(
+        times: Option<usize>,
+        cmd: AddProductCommand,
+    ) -> AddProductServiceObj {
+        let mut m = MockAddProductUseCase::new();
+
+        let res = ProductAddedEventBuilder::default()
+            .name(cmd.name().into())
+            .description(cmd.description().as_ref().map(|s| s.to_string()))
+            .image(cmd.image().as_ref().map(|s| s.to_string()))
+            .sku_able(cmd.sku_able().clone())
+            .category_id(cmd.category_id().clone())
+            .product_id(UUID.clone())
+            .price(cmd.price().clone())
+            .added_by_user(cmd.adding_by().clone())
+            .build()
+            .unwrap();
+
+        if let Some(times) = times {
+            m.expect_add_product()
+                .times(times)
+                .returning(move |_| Ok(res.clone()));
+        } else {
+            m.expect_add_product().returning(move |_| Ok(res.clone()));
+        }
+
+        Arc::new(m)
+    }
+
+    #[actix_rt::test]
+    async fn test_service_product_doesnt_exist() {
+        let cmd = get_command();
+
+        let s = AddProductServiceBuilder::default()
+            .db_product_name_exists_for_category(
+                mock_product_name_exists_for_category_db_port_false(IS_CALLED_ONLY_ONCE),
+            )
+            .db_product_id_exists(mock_product_id_exists_db_port_false(IS_CALLED_ONLY_ONCE))
+            .get_uuid(mock_get_uuid(IS_CALLED_ONLY_ONCE))
+            .build()
+            .unwrap();
+
+        let res = s.add_product(cmd.clone()).await.unwrap();
+        assert_eq!(res.name(), cmd.name());
+        assert_eq!(res.description(), cmd.description());
+        assert_eq!(res.image(), cmd.image());
+        assert_eq!(res.sku_able(), cmd.sku_able());
+        assert_eq!(res.price(), cmd.price());
+        assert_eq!(res.added_by_user(), cmd.adding_by());
+        assert_eq!(res.category_id(), cmd.category_id());
+        assert_eq!(res.product_id(), &UUID);
+    }
+
+    #[actix_rt::test]
+    async fn test_service_product_name_exists_for_store() {
+        let cmd = get_command();
+
+        let s = AddProductServiceBuilder::default()
+            .db_product_name_exists_for_category(
+                mock_product_name_exists_for_category_db_port_true(IS_CALLED_ONLY_ONCE),
+            )
+            .get_uuid(mock_get_uuid(IS_CALLED_ONLY_ONCE))
+            .db_product_id_exists(mock_product_id_exists_db_port_false(IS_CALLED_ONLY_ONCE))
+            .build()
+            .unwrap();
+
+        assert_eq!(
+            s.add_product(cmd.clone()).await,
+            Err(InventoryError::DuplicateProductName)
+        )
+    }
+}

src/inventory/application/services/errors.rs

@@ -14,6 +14,7 @@ pub type InventoryResult<V> = Result<V, InventoryError>;
 pub enum InventoryError {
     DuplicateCategoryName,
     DuplicateStoreName,
+    DuplicateProductName,
     InternalError,
 }
 
@@ -22,9 +23,18 @@ impl From<InventoryDBError> for InventoryError {
         match value {
             InventoryDBError::DuplicateCategoryName => Self::DuplicateCategoryName,
             InventoryDBError::DuplicateStoreName => Self::DuplicateStoreName,
+            InventoryDBError::DuplicateProductName => Self::DuplicateProductName,
             InventoryDBError::DuplicateStoreID => {
                 error!("DuplicateStoreID");
                 Self::InternalError
+            },
+            InventoryDBError::DuplicateProductID => {
+                error!("DuplicateProductID");
+                Self::InternalError
+            },
+            InventoryDBError::DuplicateCategoryID => {
+                error!("DuplicateCategoryID");
+                Self::InternalError
             }
             InventoryDBError::InternalError => Self::InternalError,
         }

src/inventory/application/services/mod.rs

@@ -10,18 +10,21 @@ pub mod errors;
 
 // services
 pub mod add_category_service;
+pub mod add_product_service;
 pub mod add_store_service;
 
 #[automock]
 pub trait InventoryServicesInterface: Send + Sync {
     fn add_store(&self) -> add_store_service::AddStoreServiceObj;
     fn add_category(&self) -> add_category_service::AddCategoryServiceObj;
+    fn add_product(&self) -> add_product_service::AddProductServiceObj;
 }
 
 #[derive(Clone, Builder)]
 pub struct InventoryServices {
     add_store: add_store_service::AddStoreServiceObj,
     add_category: add_category_service::AddCategoryServiceObj,
+    add_product: add_product_service::AddProductServiceObj,
 }
 
 impl InventoryServicesInterface for InventoryServices {
@@ -31,4 +34,7 @@ impl InventoryServicesInterface for InventoryServices {
     fn add_category(&self) -> add_category_service::AddCategoryServiceObj {
         self.add_category.clone()
     }
+    fn add_product(&self) -> add_product_service::AddProductServiceObj {
+        self.add_product.clone()
+    }
 }

src/inventory/domain/add_product_command.rs

@@ -0,0 +1,224 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use derive_builder::Builder;
+use derive_getters::Getters;
+use derive_more::{Display, Error};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use super::product_aggregate::Price;
+
+#[derive(Debug, Error, Display, Clone, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
+pub enum AddProductCommandError {
+    NameIsEmpty,
+}
+
+#[derive(
+    Clone, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd, Getters, Builder,
+)]
+pub struct UnvalidatedAddProductCommand {
+    name: String,
+    description: Option<String>,
+    image: Option<String>,
+    category_id: Uuid,
+    sku_able: bool,
+    price: Price,
+    adding_by: Uuid,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd, Getters)]
+pub struct AddProductCommand {
+    name: String,
+    description: Option<String>,
+    image: Option<String>,
+    category_id: Uuid,
+    sku_able: bool,
+    price: Price,
+    adding_by: Uuid,
+}
+
+impl UnvalidatedAddProductCommand {
+    pub fn validate(self) -> Result<AddProductCommand, AddProductCommandError> {
+        let description: Option<String> = if let Some(description) = self.description {
+            let description = description.trim();
+            if description.is_empty() {
+                None
+            } else {
+                Some(description.to_owned())
+            }
+        } else {
+            None
+        };
+
+        let image: Option<String> = if let Some(image) = self.image {
+            let image = image.trim();
+            if image.is_empty() {
+                None
+            } else {
+                Some(image.to_owned())
+            }
+        } else {
+            None
+        };
+
+        let name = self.name.trim().to_owned();
+        if name.is_empty() {
+            return Err(AddProductCommandError::NameIsEmpty);
+        }
+
+        Ok(AddProductCommand {
+            name,
+            description,
+            image,
+            category_id: self.category_id,
+            sku_able: self.sku_able,
+            price: self.price,
+            adding_by: self.adding_by,
+        })
+    }
+}
+
+#[cfg(test)]
+pub mod tests {
+    use super::*;
+
+    use crate::{
+        inventory::domain::product_aggregate::{Currency, PriceBuilder},
+        utils::uuid::tests::UUID,
+    };
+
+    pub fn get_command() -> AddProductCommand {
+        let name = "foo";
+        let adding_by = UUID;
+        let category_id = Uuid::new_v4();
+        let sku_able = false;
+        let image = Some("image".to_string());
+        let description = Some("description".to_string());
+
+        let price = PriceBuilder::default()
+            .minor(0)
+            .major(100)
+            .currency(Currency::INR)
+            .build()
+            .unwrap();
+
+        let cmd = UnvalidatedAddProductCommandBuilder::default()
+            .name(name.into())
+            .description(description.clone())
+            .image(image.clone())
+            .category_id(category_id.clone())
+            .adding_by(adding_by.clone())
+            .sku_able(sku_able)
+            .price(price.clone())
+            .build()
+            .unwrap();
+
+        cmd.validate().unwrap()
+    }
+
+    #[test]
+    fn test_description_and_image_none() {
+        let name = "foo";
+        let adding_by = UUID;
+        let category_id = Uuid::new_v4();
+        let sku_able = false;
+
+        let price = PriceBuilder::default()
+            .minor(0)
+            .major(100)
+            .currency(Currency::INR)
+            .build()
+            .unwrap();
+
+        // description = None
+        let cmd = UnvalidatedAddProductCommandBuilder::default()
+            .name(name.into())
+            .description(None)
+            .image(None)
+            .category_id(category_id.clone())
+            .adding_by(adding_by.clone())
+            .sku_able(sku_able)
+            .price(price.clone())
+            .build()
+            .unwrap();
+
+        let cmd = cmd.validate().unwrap();
+
+        assert_eq!(cmd.name(), name);
+        assert_eq!(cmd.description(), &None);
+        assert_eq!(cmd.adding_by(), &adding_by);
+        assert_eq!(cmd.category_id(), &category_id);
+        assert_eq!(cmd.image(), &None);
+        assert_eq!(cmd.sku_able(), &sku_able);
+        assert_eq!(cmd.price(), &price);
+    }
+    #[test]
+    fn test_description_some() {
+        let name = "foo";
+        let adding_by = UUID;
+        let category_id = Uuid::new_v4();
+        let sku_able = false;
+        let image = Some("image".to_string());
+        let description = Some("description".to_string());
+
+        let price = PriceBuilder::default()
+            .minor(0)
+            .major(100)
+            .currency(Currency::INR)
+            .build()
+            .unwrap();
+
+        let cmd = UnvalidatedAddProductCommandBuilder::default()
+            .name(name.into())
+            .description(description.clone())
+            .image(image.clone())
+            .category_id(category_id.clone())
+            .adding_by(adding_by.clone())
+            .sku_able(sku_able)
+            .price(price.clone())
+            .build()
+            .unwrap();
+
+        let cmd = cmd.validate().unwrap();
+
+        assert_eq!(cmd.name(), name);
+        assert_eq!(cmd.description(), &description);
+        assert_eq!(cmd.adding_by(), &adding_by);
+        assert_eq!(cmd.category_id(), &category_id);
+        assert_eq!(cmd.image(), &image);
+        assert_eq!(cmd.sku_able(), &sku_able);
+        assert_eq!(cmd.price(), &price);
+    }
+
+    #[test]
+    fn test_name_is_empty() {
+        let adding_by = UUID;
+        let category_id = Uuid::new_v4();
+        let sku_able = false;
+        let image = Some("image".to_string());
+        let description = Some("description".to_string());
+
+        let price = PriceBuilder::default()
+            .minor(0)
+            .major(100)
+            .currency(Currency::INR)
+            .build()
+            .unwrap();
+
+        let cmd = UnvalidatedAddProductCommandBuilder::default()
+            .name("".into())
+            .description(description.clone())
+            .image(image.clone())
+            .category_id(category_id.clone())
+            .adding_by(adding_by.clone())
+            .sku_able(sku_able)
+            .price(price.clone())
+            .build()
+            .unwrap();
+
+        // AddProductCommandError::NameIsEmpty
+        assert_eq!(cmd.validate(), Err(AddProductCommandError::NameIsEmpty))
+    }
+}

src/inventory/domain/commands.rs

@@ -5,10 +5,14 @@
 use mockall::predicate::*;
 use serde::{Deserialize, Serialize};
 
-use super::{add_category_command::AddCategoryCommand, add_store_command::AddStoreCommand};
+use super::{
+    add_category_command::AddCategoryCommand, add_product_command::AddProductCommand,
+    add_store_command::AddStoreCommand,
+};
 
 #[derive(Clone, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd)]
 pub enum InventoryCommand {
     AddCategory(AddCategoryCommand),
     AddStore(AddStoreCommand),
+    AddProduct(AddProductCommand),
 }

src/inventory/domain/events.rs

@@ -5,16 +5,18 @@
 use cqrs_es::DomainEvent;
 use serde::{Deserialize, Serialize};
 
-use super::{category_added_event::*, store_added_event::StoreAddedEvent};
+use super::{
+    category_added_event::*, product_added_event::ProductAddedEvent,
+    store_added_event::StoreAddedEvent,
+};
 
 #[derive(Clone, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd)]
 pub enum InventoryEvent {
     CategoryAdded(CategoryAddedEvent),
     StoreAdded(StoreAddedEvent),
+    ProductAdded(ProductAddedEvent),
 }
 
-//TODO: define password type that takes string and converts to hash
-
 impl DomainEvent for InventoryEvent {
     fn event_version(&self) -> String {
         "1.0".to_string()
@@ -23,7 +25,8 @@ impl DomainEvent for InventoryEvent {
     fn event_type(&self) -> String {
         let e: &str = match self {
             InventoryEvent::CategoryAdded { .. } => "InventoryCategoryAdded",
-            InventoryEvent::StoreAdded { .. } => "InventoryStoredded",
+            InventoryEvent::StoreAdded { .. } => "InventoryStoreAdded",
+            InventoryEvent::ProductAdded { .. } => "InventoryProductAdded",
         };
 
         e.to_string()

src/inventory/domain/mod.rs

@@ -3,18 +3,19 @@
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
 // aggregates
-//pub mod money_aggregate;
-//pub mod product_aggregate;
 pub mod category_aggregate;
+pub mod product_aggregate;
 //pub mod stock_aggregate;
 pub mod store_aggregate;
 
 // commands
 pub mod add_category_command;
+pub mod add_product_command;
 pub mod add_store_command;
 pub mod commands;
 
 // events
 pub mod category_added_event;
 pub mod events;
+pub mod product_added_event;
 pub mod store_added_event;

src/inventory/domain/product_added_event.rs

@@ -0,0 +1,48 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use derive_builder::Builder;
+use derive_getters::Getters;
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use super::product_aggregate::Price;
+
+#[derive(
+    Clone, Debug, Builder, Serialize, Deserialize, Getters, Eq, PartialEq, Ord, PartialOrd,
+)]
+pub struct ProductAddedEvent {
+    added_by_user: Uuid,
+
+    name: String,
+    description: Option<String>,
+    image: Option<String>, // string = file_name
+    price: Price,
+    category_id: Uuid,
+    sku_able: bool,
+    product_id: Uuid,
+}
+
+#[cfg(test)]
+pub mod tests {
+    use crate::inventory::domain::add_product_command::AddProductCommand;
+
+    use super::*;
+
+    use crate::utils::uuid::tests::UUID;
+
+    pub fn get_event_from_command(cmd: &AddProductCommand) -> ProductAddedEvent {
+        ProductAddedEventBuilder::default()
+            .name(cmd.name().into())
+            .description(cmd.description().as_ref().map(|s| s.to_string()))
+            .image(cmd.image().as_ref().map(|s| s.to_string()))
+            .sku_able(cmd.sku_able().clone())
+            .category_id(cmd.category_id().clone())
+            .product_id(UUID.clone())
+            .price(cmd.price().clone())
+            .added_by_user(cmd.adding_by().clone())
+            .build()
+            .unwrap()
+    }
+}

src/inventory/domain/product_aggregate.rs

@@ -0,0 +1,165 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use std::str::FromStr;
+
+use async_trait::async_trait;
+use cqrs_es::Aggregate;
+use derive_builder::Builder;
+use derive_getters::Getters;
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use super::{commands::InventoryCommand, events::InventoryEvent};
+use crate::inventory::application::services::errors::*;
+use crate::inventory::application::services::InventoryServicesInterface;
+
+#[derive(
+    Clone, Debug, Default, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd, Getters, Builder,
+)]
+pub struct Product {
+    name: String,
+    description: Option<String>,
+    image: Option<String>, // string = file_name
+    price: Price,
+    category_id: Uuid,
+    sku_able: bool,
+    product_id: Uuid,
+}
+
+#[derive(
+    Clone, Default, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd, Getters, Builder,
+)]
+pub struct Price {
+    major: usize,
+    minor: usize,
+    currency: Currency,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd)]
+pub enum Currency {
+    INR,
+}
+
+impl ToString for Currency {
+    fn to_string(&self) -> String {
+        match self {
+            Self::INR => "INR".into(),
+        }
+    }
+}
+
+impl FromStr for Currency {
+    type Err = String;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let s = s.trim();
+        let inr = Self::INR.to_string();
+        match s {
+            inr => Ok(Self::INR),
+            _ => Err("Currency unsupported".into()),
+        }
+    }
+}
+
+impl Default for Currency {
+    fn default() -> Self {
+        Self::INR
+    }
+}
+
+#[async_trait]
+impl Aggregate for Product {
+    type Command = InventoryCommand;
+    type Event = InventoryEvent;
+    type Error = InventoryError;
+    type Services = std::sync::Arc<dyn InventoryServicesInterface>;
+
+    // This identifier should be unique to the system.
+    fn aggregate_type() -> String {
+        "inventory.product".to_string()
+    }
+
+    // The aggregate logic goes here. Note that this will be the _bulk_ of a CQRS system
+    // so expect to use helper functions elsewhere to keep the code clean.
+    async fn handle(
+        &self,
+        command: Self::Command,
+        services: &Self::Services,
+    ) -> Result<Vec<Self::Event>, Self::Error> {
+        match command {
+            InventoryCommand::AddProduct(cmd) => {
+                let res = services.add_product().add_product(cmd).await?;
+                Ok(vec![InventoryEvent::ProductAdded(res)])
+            }
+            _ => Ok(Vec::default()),
+        }
+    }
+
+    fn apply(&mut self, event: Self::Event) {
+        match event {
+            InventoryEvent::ProductAdded(e) => {
+                *self = ProductBuilder::default()
+                    .name(e.name().into())
+                    .description(e.description().clone())
+                    .image(e.image().clone())
+                    .price(e.price().clone())
+                    .category_id(e.category_id().clone())
+                    .sku_able(e.sku_able().clone())
+                    .product_id(e.product_id().clone())
+                    .build()
+                    .unwrap();
+            }
+            _ => (),
+        }
+    }
+}
+
+#[cfg(test)]
+mod aggregate_tests {
+    use std::sync::Arc;
+
+    use cqrs_es::test::TestFramework;
+
+    use super::*;
+    use crate::inventory::{
+        application::services::{add_product_service::tests::*, *},
+        domain::{
+            add_product_command::tests::get_command, commands::InventoryCommand,
+            events::InventoryEvent, product_added_event::tests::get_event_from_command,
+        },
+    };
+    use crate::tests::bdd::*;
+
+    type ProductTestFramework = TestFramework<Product>;
+
+    #[test]
+    fn test_create_product() {
+        let cmd = get_command();
+        let expected = get_event_from_command(&cmd);
+        let expected = InventoryEvent::ProductAdded(expected);
+
+        let mut services = MockInventoryServicesInterface::new();
+        services
+            .expect_add_product()
+            .times(IS_CALLED_ONLY_ONCE.unwrap())
+            .return_const(mock_add_product_service(IS_CALLED_ONLY_ONCE, cmd.clone()));
+
+        ProductTestFramework::with(Arc::new(services))
+            .given_no_previous_events()
+            .when(InventoryCommand::AddProduct(cmd))
+            .then_expect_events(vec![expected]);
+    }
+
+    #[test]
+    fn currency_to_string_from_str() {
+        assert_eq!(Currency::INR.to_string(), "INR".to_string());
+
+        assert_eq!(Currency::from_str("INR").unwrap(), Currency::INR);
+
+        assert_eq!(
+            Currency::from_str(Currency::INR.to_string().as_str()).unwrap(),
+            Currency::INR
+        );
+    }
+}