109 lines
3.4 KiB
Ruby
109 lines
3.4 KiB
Ruby
# frozen_string_literal: true
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module Namespaces
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module Traversal
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module LinearScopes
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extend ActiveSupport::Concern
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class_methods do
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# When filtering namespaces by the traversal_ids column to compile a
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# list of namespace IDs, it can be faster to reference the ID in
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# traversal_ids than the primary key ID column.
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def as_ids
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return super unless use_traversal_ids?
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select('namespaces.traversal_ids[array_length(namespaces.traversal_ids, 1)] AS id')
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end
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def self_and_ancestors(include_self: true, hierarchy_order: nil)
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return super unless use_traversal_ids_for_ancestor_scopes?
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records = unscoped
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.without_sti_condition
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.where(id: without_sti_condition.select('unnest(traversal_ids)'))
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.order_by_depth(hierarchy_order)
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.normal_select
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if include_self
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records
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else
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records.where.not(id: all.as_ids)
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end
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end
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def self_and_ancestor_ids(include_self: true)
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return super unless use_traversal_ids_for_ancestor_scopes?
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self_and_ancestors(include_self: include_self).as_ids
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end
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def self_and_descendants(include_self: true)
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return super unless use_traversal_ids?
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records = self_and_descendants_with_duplicates(include_self: include_self)
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distinct = records.select('DISTINCT on(namespaces.id) namespaces.*')
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distinct.normal_select
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end
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def self_and_descendant_ids(include_self: true)
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return super unless use_traversal_ids?
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self_and_descendants_with_duplicates(include_self: include_self)
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.select('DISTINCT namespaces.id')
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end
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# Make sure we drop the STI `type = 'Group'` condition for better performance.
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# Logically equivalent so long as hierarchies remain homogeneous.
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def without_sti_condition
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unscope(where: :type)
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end
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def order_by_depth(hierarchy_order)
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return all unless hierarchy_order
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depth_order = hierarchy_order == :asc ? :desc : :asc
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all
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.select(Arel.star, 'array_length(traversal_ids, 1) as depth')
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.order(depth: depth_order, id: :asc)
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end
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# Produce a query of the form: SELECT * FROM namespaces;
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#
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# When we have queries that break this SELECT * format we can run in to errors.
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# For example `SELECT DISTINCT on(...)` will fail when we chain a `.count` c
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def normal_select
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unscoped.without_sti_condition.from(all, :namespaces)
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end
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private
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def use_traversal_ids?
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Feature.enabled?(:use_traversal_ids, default_enabled: :yaml)
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end
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def use_traversal_ids_for_ancestor_scopes?
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Feature.enabled?(:use_traversal_ids_for_ancestor_scopes, default_enabled: :yaml) &&
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use_traversal_ids?
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end
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def self_and_descendants_with_duplicates(include_self: true)
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base_ids = select(:id)
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records = unscoped
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.without_sti_condition
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.from("namespaces, (#{base_ids.to_sql}) base")
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.where('namespaces.traversal_ids @> ARRAY[base.id]')
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if include_self
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records
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else
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records.where('namespaces.id <> base.id')
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end
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end
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end
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end
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end
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end
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