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# frozen_string_literal: true
class DropFkGcpClustersTable < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
def up
remove_foreign_key_if_exists :gcp_clusters, column: :project_id
remove_foreign_key_if_exists :gcp_clusters, column: :user_id
remove_foreign_key_if_exists :gcp_clusters, column: :service_id
end
def down
add_foreign_key_if_not_exists :gcp_clusters, :projects, column: :project_id, on_delete: :cascade
add_foreign_key_if_not_exists :gcp_clusters, :users, column: :user_id, on_delete: :nullify
add_foreign_key_if_not_exists :gcp_clusters, :services, column: :service_id, on_delete: :nullify
end
private
def add_foreign_key_if_not_exists(source, target, column:, on_delete:)
return unless table_exists?(source)
return if foreign_key_exists?(source, target, column: column)
add_concurrent_foreign_key(source, target, column: column, on_delete: on_delete)
end
def remove_foreign_key_if_exists(table, column:)
return unless table_exists?(table)
return unless foreign_key_exists?(table, column: column)
remove_foreign_key(table, column: column)
end
end
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