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

@@ -215,6 +215,7 @@ mod tests {
                 add_customization_service::tests::mock_add_customization_service,
                 add_product_service::tests::mock_add_product_service,
                 add_store_service::AddStoreServiceBuilder,
+                update_category_service::tests::mock_update_category_service,
                 update_customization_service::tests::mock_update_customization_service,
                 update_product_service::tests::mock_update_product_service,
                 InventoryServicesBuilder,
@@ -223,6 +224,7 @@ mod tests {
                 add_category_command::AddCategoryCommand, add_customization_command,
                 add_product_command::tests::get_command, add_store_command::AddStoreCommand,
                 commands::InventoryCommand,
+                update_category_command::tests::get_update_category_command,
                 update_customization_command::tests::get_update_customization_command,
                 update_product_command,
             },
@@ -273,6 +275,10 @@ mod tests {
                 IS_NEVER_CALLED,
                 get_update_customization_command(),
             ))
+            .update_category(mock_update_category_service(
+                IS_NEVER_CALLED,
+                get_update_category_command(),
+            ))
             .build()
             .unwrap();
 

src/inventory/application/services/mod.rs

@@ -13,6 +13,7 @@ pub mod add_category_service;
 pub mod add_customization_service;
 pub mod add_product_service;
 pub mod add_store_service;
+pub mod update_category_service;
 pub mod update_customization_service;
 pub mod update_product_service;
 
@@ -24,6 +25,7 @@ pub trait InventoryServicesInterface: Send + Sync {
     fn add_customization(&self) -> add_customization_service::AddCustomizationServiceObj;
     fn update_product(&self) -> update_product_service::UpdateProductServiceObj;
     fn update_customization(&self) -> update_customization_service::UpdateCustomizationServiceObj;
+    fn update_category(&self) -> update_category_service::UpdateCategoryServiceObj;
 }
 
 #[derive(Clone, Builder)]
@@ -34,6 +36,7 @@ pub struct InventoryServices {
     add_customization: add_customization_service::AddCustomizationServiceObj,
     update_product: update_product_service::UpdateProductServiceObj,
     update_customization: update_customization_service::UpdateCustomizationServiceObj,
+    update_category: update_category_service::UpdateCategoryServiceObj,
 }
 
 impl InventoryServicesInterface for InventoryServices {
@@ -58,4 +61,8 @@ impl InventoryServicesInterface for InventoryServices {
     fn update_customization(&self) -> update_customization_service::UpdateCustomizationServiceObj {
         self.update_customization.clone()
     }
+
+    fn update_category(&self) -> update_category_service::UpdateCategoryServiceObj {
+        self.update_category.clone()
+    }
 }

src/inventory/application/services/update_category_service.rs

@@ -1,3 +1,197 @@
-// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+/// 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::{
+        category_id_exists::*, category_name_exists_for_store::*, store_id_exists::*,
+    },
+    domain::{category_aggregate::*, category_updated_event::*, update_category_command::*},
+};
+use crate::utils::uuid::*;
+
+#[automock]
+#[async_trait::async_trait]
+pub trait UpdateCategoryUseCase: Send + Sync {
+    async fn update_category(
+        &self,
+        cmd: UpdateCategoryCommand,
+    ) -> InventoryResult<CategoryUpdatedEvent>;
+}
+
+pub type UpdateCategoryServiceObj = Arc<dyn UpdateCategoryUseCase>;
+
+#[derive(Clone, Builder)]
+pub struct UpdateCategoryService {
+    // TODO: check if store ID exists
+    db_category_name_exists_for_store: CategoryNameExistsForStoreDBPortObj,
+    db_category_id_exists: CategoryIDExistsDBPortObj,
+    db_store_id_exists: StoreIDExistsDBPortObj,
+}
+
+#[async_trait::async_trait]
+impl UpdateCategoryUseCase for UpdateCategoryService {
+    async fn update_category(
+        &self,
+        cmd: UpdateCategoryCommand,
+    ) -> InventoryResult<CategoryUpdatedEvent> {
+        if !self
+            .db_category_id_exists
+            .category_id_exists(cmd.old_category().category_id())
+            .await?
+        {
+            return Err(InventoryError::CategoryIDNotFound);
+        }
+
+        if !self
+            .db_store_id_exists
+            .store_id_exists(cmd.old_category().store_id())
+            .await?
+        {
+            return Err(InventoryError::StoreIDNotFound);
+        }
+
+        let updated_category = CategoryBuilder::default()
+            .name(cmd.name().into())
+            .description(cmd.description().as_ref().map(|s| s.to_string()))
+            .category_id(*cmd.old_category().category_id())
+            .store_id(*cmd.old_category().store_id())
+            .build()
+            .unwrap();
+
+        if updated_category.name() != cmd.old_category().name() {
+            if self
+                .db_category_name_exists_for_store
+                .category_name_exists_for_store(&updated_category)
+                .await?
+            {
+                return Err(InventoryError::DuplicateCategoryName);
+            }
+        }
+
+        Ok(CategoryUpdatedEventBuilder::default()
+            .added_by_user(*cmd.adding_by())
+            .old_category(cmd.old_category().clone())
+            .new_category(updated_category)
+            .build()
+            .unwrap())
+    }
+}
+
+#[cfg(test)]
+pub mod tests {
+    use super::*;
+
+    use crate::inventory::domain::category_updated_event;
+    use crate::inventory::domain::update_category_command::tests::get_update_category_command;
+    use crate::utils::uuid::tests::UUID;
+    use crate::{tests::bdd::*, utils::uuid::tests::mock_get_uuid};
+
+    pub fn mock_update_category_service(
+        times: Option<usize>,
+        cmd: UpdateCategoryCommand,
+    ) -> UpdateCategoryServiceObj {
+        let mut m = MockUpdateCategoryUseCase::new();
+
+        let res = category_updated_event::tests::get_category_updated_event_from_command(&cmd);
+
+        if let Some(times) = times {
+            m.expect_update_category()
+                .times(times)
+                .returning(move |_| Ok(res.clone()));
+        } else {
+            m.expect_update_category()
+                .returning(move |_| Ok(res.clone()));
+        }
+
+        Arc::new(m)
+    }
+
+    #[actix_rt::test]
+    async fn test_service() {
+        let cmd = get_update_category_command();
+
+        let s = UpdateCategoryServiceBuilder::default()
+            .db_store_id_exists(mock_store_id_exists_db_port_true(IS_CALLED_ONLY_ONCE))
+            .db_category_name_exists_for_store(mock_category_name_exists_for_store_db_port_false(
+                IS_CALLED_ONLY_ONCE,
+            ))
+            .db_category_id_exists(mock_category_id_exists_db_port_true(IS_CALLED_ONLY_ONCE))
+            .build()
+            .unwrap();
+
+        let res = s.update_category(cmd.clone()).await.unwrap();
+        assert_eq!(res.new_category().name(), cmd.name());
+        assert_eq!(res.new_category().description(), cmd.description());
+        assert_eq!(res.new_category().store_id(), cmd.old_category().store_id());
+        assert_eq!(
+            res.new_category().category_id(),
+            cmd.old_category().category_id()
+        );
+        assert_eq!(res.old_category(), cmd.old_category());
+        assert_eq!(res.added_by_user(), cmd.adding_by());
+    }
+
+    #[actix_rt::test]
+    async fn test_service_store_doesnt_exist() {
+        let cmd = get_update_category_command();
+
+        let s = UpdateCategoryServiceBuilder::default()
+            .db_store_id_exists(mock_store_id_exists_db_port_false(IS_CALLED_ONLY_ONCE))
+            .db_category_name_exists_for_store(mock_category_name_exists_for_store_db_port_false(
+                IS_NEVER_CALLED,
+            ))
+            .db_category_id_exists(mock_category_id_exists_db_port_true(IS_CALLED_ONLY_ONCE))
+            .build()
+            .unwrap();
+
+        assert_eq!(
+            s.update_category(cmd.clone()).await,
+            Err(InventoryError::StoreIDNotFound)
+        );
+    }
+
+    #[actix_rt::test]
+    async fn test_category_id_not_found() {
+        let cmd = get_update_category_command();
+
+        let s = UpdateCategoryServiceBuilder::default()
+            .db_store_id_exists(mock_store_id_exists_db_port_true(IS_NEVER_CALLED))
+            .db_category_name_exists_for_store(mock_category_name_exists_for_store_db_port_false(
+                IS_NEVER_CALLED,
+            ))
+            .db_category_id_exists(mock_category_id_exists_db_port_false(IS_CALLED_ONLY_ONCE))
+            .build()
+            .unwrap();
+
+        assert_eq!(
+            s.update_category(cmd.clone()).await,
+            Err(InventoryError::CategoryIDNotFound)
+        );
+    }
+
+    #[actix_rt::test]
+    async fn test_duplicate_new_name() {
+        let cmd = get_update_category_command();
+
+        let s = UpdateCategoryServiceBuilder::default()
+            .db_store_id_exists(mock_store_id_exists_db_port_true(IS_CALLED_ONLY_ONCE))
+            .db_category_name_exists_for_store(mock_category_name_exists_for_store_db_port_true(
+                IS_CALLED_ONLY_ONCE,
+            ))
+            .db_category_id_exists(mock_category_id_exists_db_port_true(IS_CALLED_ONLY_ONCE))
+            .build()
+            .unwrap();
+
+        assert_eq!(
+            s.update_category(cmd.clone()).await,
+            Err(InventoryError::DuplicateCategoryName)
+        );
+    }
+}

src/inventory/domain/category_aggregate.rs

@@ -50,19 +50,28 @@ impl Aggregate for Category {
                 let res = services.add_category().add_category(cmd).await?;
                 Ok(vec![InventoryEvent::CategoryAdded(res)])
             }
+            InventoryCommand::UpdateCategory(cmd) => {
+                let res = services.update_category().update_category(cmd).await?;
+                Ok(vec![InventoryEvent::CategoryUpdated(res)])
+            }
             _ => Ok(Vec::default()),
         }
     }
 
     fn apply(&mut self, event: Self::Event) {
-        if let InventoryEvent::CategoryAdded(e) = event {
-            *self = CategoryBuilder::default()
-                .name(e.name().into())
-                .category_id(*e.category_id())
-                .description(e.description().clone())
-                .store_id(*e.store_id())
-                .build()
-                .unwrap();
+        match event {
+            InventoryEvent::CategoryAdded(e) => {
+                *self = CategoryBuilder::default()
+                    .name(e.name().into())
+                    .category_id(*e.category_id())
+                    .description(e.description().clone())
+                    .store_id(*e.store_id())
+                    .build()
+                    .unwrap()
+            }
+
+            InventoryEvent::CategoryUpdated(e) => *self = e.new_category().clone(),
+            _ => (),
         }
     }
 }
@@ -72,14 +81,17 @@ mod aggregate_tests {
     use std::sync::Arc;
 
     use cqrs_es::test::TestFramework;
+    use update_category_service::tests::mock_update_category_service;
     use uuid::Uuid;
 
     use super::*;
     use crate::inventory::{
         application::services::{add_category_service::tests::*, *},
         domain::{
-            add_category_command::*, category_added_event::*, commands::InventoryCommand,
-            events::InventoryEvent,
+            add_category_command::*, category_added_event::*,
+            category_updated_event::tests::get_category_updated_event_from_command,
+            commands::InventoryCommand, events::InventoryEvent,
+            update_category_command::tests::get_update_category_command,
         },
     };
     use crate::tests::bdd::*;
@@ -119,4 +131,26 @@ mod aggregate_tests {
             .when(InventoryCommand::AddCategory(cmd))
             .then_expect_events(vec![expected]);
     }
+
+    #[test]
+    fn test_update_category() {
+        let cmd = get_update_category_command();
+
+        let expected = get_category_updated_event_from_command(&cmd);
+        let expected = InventoryEvent::CategoryUpdated(expected);
+
+        let mut services = MockInventoryServicesInterface::new();
+        services
+            .expect_update_category()
+            .times(IS_CALLED_ONLY_ONCE.unwrap())
+            .return_const(mock_update_category_service(
+                IS_CALLED_ONLY_ONCE,
+                cmd.clone(),
+            ));
+
+        CategoryTestFramework::with(Arc::new(services))
+            .given_no_previous_events()
+            .when(InventoryCommand::UpdateCategory(cmd))
+            .then_expect_events(vec![expected]);
+    }
 }

src/inventory/domain/category_updated_event.rs

@@ -0,0 +1,45 @@
+// 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::category_aggregate::*;
+
+#[derive(
+    Clone, Debug, Builder, Serialize, Deserialize, Getters, Eq, PartialEq, Ord, PartialOrd,
+)]
+pub struct CategoryUpdatedEvent {
+    added_by_user: Uuid,
+    new_category: Category,
+    old_category: Category,
+}
+
+#[cfg(test)]
+pub mod tests {
+    use crate::inventory::domain::update_category_command::UpdateCategoryCommand;
+
+    use super::*;
+
+    pub fn get_category_updated_event_from_command(
+        cmd: &UpdateCategoryCommand,
+    ) -> CategoryUpdatedEvent {
+        let category = CategoryBuilder::default()
+            .name(cmd.name().into())
+            .description(cmd.description().as_ref().map(|s| s.to_string()))
+            .category_id(*cmd.old_category().category_id())
+            .store_id(*cmd.old_category().store_id())
+            .build()
+            .unwrap();
+
+        CategoryUpdatedEventBuilder::default()
+            .new_category(category)
+            .old_category(cmd.old_category().clone())
+            .added_by_user(*cmd.adding_by())
+            .build()
+            .unwrap()
+    }
+}

src/inventory/domain/commands.rs

@@ -8,6 +8,7 @@ use serde::{Deserialize, Serialize};
 use super::{
     add_category_command::AddCategoryCommand, add_customization_command::AddCustomizationCommand,
     add_product_command::AddProductCommand, add_store_command::AddStoreCommand,
+    update_category_command::UpdateCategoryCommand,
     update_customization_command::UpdateCustomizationCommand,
     update_product_command::UpdateProductCommand,
 };
@@ -20,4 +21,5 @@ pub enum InventoryCommand {
     AddCustomization(AddCustomizationCommand),
     UpdateProduct(UpdateProductCommand),
     UpdateCustomization(UpdateCustomizationCommand),
+    UpdateCategory(UpdateCategoryCommand),
 }

src/inventory/domain/customization_updated_event.rs

@@ -28,9 +28,6 @@ pub mod tests {
 
     use super::*;
 
-    #[test]
-    fn test_name() {}
-
     pub fn get_customization_updated_event_from_command(
         cmd: &UpdateCustomizationCommand,
     ) -> CustomizationUpdatedEvent {

src/inventory/domain/events.rs

@@ -6,7 +6,8 @@ use cqrs_es::DomainEvent;
 use serde::{Deserialize, Serialize};
 
 use super::{
-    category_added_event::*, customization_added_event::CustomizationAddedEvent,
+    category_added_event::*, category_updated_event::CategoryUpdatedEvent,
+    customization_added_event::CustomizationAddedEvent,
     customization_updated_event::CustomizationUpdatedEvent, product_added_event::ProductAddedEvent,
     product_updated_event::ProductUpdatedEvent, store_added_event::StoreAddedEvent,
 };
@@ -19,6 +20,7 @@ pub enum InventoryEvent {
     CustomizationAdded(CustomizationAddedEvent),
     ProductUpdated(ProductUpdatedEvent),
     CustomizationUpdated(CustomizationUpdatedEvent),
+    CategoryUpdated(CategoryUpdatedEvent),
 }
 
 impl DomainEvent for InventoryEvent {
@@ -34,6 +36,7 @@ impl DomainEvent for InventoryEvent {
             InventoryEvent::CustomizationAdded { .. } => "InventoryCustomizationAdded",
             InventoryEvent::ProductUpdated { .. } => "InventoryProductUpdated",
             InventoryEvent::CustomizationUpdated { .. } => "InventoryCustomizationUpdated",
+            InventoryEvent::CategoryUpdated { .. } => "InventoryCategoryUpdated",
         };
 
         e.to_string()

src/inventory/domain/mod.rs

@@ -15,11 +15,13 @@ pub mod add_customization_command;
 pub mod add_product_command;
 pub mod add_store_command;
 pub mod commands;
+pub mod update_category_command;
 pub mod update_customization_command;
 pub mod update_product_command;
 
 // events
 pub mod category_added_event;
+pub mod category_updated_event;
 pub mod customization_added_event;
 pub mod customization_updated_event;
 pub mod events;

src/inventory/domain/update_category_command.rs

@@ -0,0 +1,117 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use derive_getters::Getters;
+use derive_more::{Display, Error};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use super::category_aggregate::*;
+
+#[derive(Debug, Error, Display, Clone, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
+pub enum UpdateCategoryCommandError {
+    NameIsEmpty,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd, Getters)]
+pub struct UpdateCategoryCommand {
+    name: String,
+    description: Option<String>,
+    adding_by: Uuid,
+
+    old_category: Category,
+}
+
+impl UpdateCategoryCommand {
+    pub fn new(
+        name: String,
+        description: Option<String>,
+        old_category: Category,
+        adding_by: Uuid,
+    ) -> Result<Self, UpdateCategoryCommandError> {
+        let description: Option<String> = if let Some(description) = description {
+            let description = description.trim();
+            if description.is_empty() {
+                None
+            } else {
+                Some(description.to_owned())
+            }
+        } else {
+            None
+        };
+
+        let name = name.trim().to_owned();
+        if name.is_empty() {
+            return Err(UpdateCategoryCommandError::NameIsEmpty);
+        }
+
+        Ok(Self {
+            name,
+            description,
+            old_category,
+            adding_by,
+        })
+    }
+}
+
+#[cfg(test)]
+pub mod tests {
+    use super::*;
+
+    use crate::utils::uuid::tests::UUID;
+
+    pub fn get_update_category_command() -> UpdateCategoryCommand {
+        let name = "foo";
+        let description = "bar";
+        let adding_by = UUID;
+        let old_category = Category::default();
+        UpdateCategoryCommand::new(
+            name.into(),
+            Some(description.into()),
+            old_category.clone(),
+            adding_by,
+        )
+        .unwrap()
+    }
+
+    #[test]
+    fn test_cmd() {
+        let name = "foo";
+        let description = "bar";
+        let adding_by = UUID;
+        let old_category = Category::default();
+
+        // description = None
+        let cmd =
+            UpdateCategoryCommand::new(name.into(), None, old_category.clone(), adding_by).unwrap();
+        assert_eq!(cmd.name(), name);
+        assert_eq!(cmd.description(), &None);
+        assert_eq!(cmd.adding_by(), &adding_by);
+        assert_eq!(cmd.old_category(), &old_category);
+
+        // description = Some
+        let cmd = UpdateCategoryCommand::new(
+            name.into(),
+            Some(description.into()),
+            old_category.clone(),
+            adding_by,
+        )
+        .unwrap();
+        assert_eq!(cmd.name(), name);
+        assert_eq!(cmd.description(), &Some(description.to_owned()));
+        assert_eq!(cmd.adding_by(), &adding_by);
+        assert_eq!(cmd.old_category(), &old_category);
+
+        // UpdateCategoryCommandError::NameIsEmpty
+        assert_eq!(
+            UpdateCategoryCommand::new(
+                "".into(),
+                Some(description.into()),
+                old_category,
+                adding_by,
+            ),
+            Err(UpdateCategoryCommandError::NameIsEmpty)
+        )
+    }
+}