54 lines
2.1 KiB
Ruby
54 lines
2.1 KiB
Ruby
# frozen_string_literal: true
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module Preloaders
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module Environments
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# This class is to batch-load deployments of multiple environments.
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# The deployments to batch-load are fetched using UNION of N selects in a single query instead of default scoping with `IN (environment_id1, environment_id2 ...)`.
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# See https://gitlab.com/gitlab-org/gitlab/-/issues/345672#note_761852224 for more details.
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class DeploymentPreloader
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attr_reader :environments
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def initialize(environments)
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@environments = environments
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end
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def execute_with_union(association_name, association_attributes)
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load_deployment_association(association_name, association_attributes)
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end
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private
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def load_deployment_association(association_name, association_attributes)
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return unless environments.present?
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# Not using Gitlab::SQL::Union as `order_by` in the SQL constructed is ignored.
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# See:
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# 1) https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/sql/union.rb#L7
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# 2) https://gitlab.com/gitlab-org/gitlab/-/issues/353966#note_860928647
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union_sql = environments.map do |environment|
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"(#{environment.association(association_name).scope.to_sql})"
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end.join(' UNION ')
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deployments = Deployment
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.from("(#{union_sql}) #{::Deployment.table_name}")
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.preload(association_attributes)
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deployments_by_environment_id = deployments.index_by(&:environment_id)
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environments.each do |environment|
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associated_deployment = deployments_by_environment_id[environment.id]
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environment.association(association_name).target = associated_deployment
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environment.association(association_name).loaded!
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next unless associated_deployment
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# `last?` in DeploymentEntity requires this environment to be loaded
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associated_deployment.association(:environment).target = environment
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associated_deployment.association(:environment).loaded!
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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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