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