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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class AddPipelineIdToMergeRequestMetrics < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
disable_ddl_transaction!
# Set this constant to true if this migration requires downtime.
DOWNTIME = true
# When a migration requires downtime you **must** uncomment the following
# constant and define a short and easy to understand explanation as to why the
# migration requires downtime.
DOWNTIME_REASON = 'Adding a foreign key'
# When using the methods "add_concurrent_index" or "add_column_with_default"
# you must disable the use of transactions as these methods can not run in an
# existing transaction. When using "add_concurrent_index" make sure that this
# method is the _only_ method called in the migration, any other changes
# should go in a separate migration. This ensures that upon failure _only_ the
# index creation fails and can be retried or reverted easily.
#
# To disable transactions uncomment the following line and remove these
# comments:
# disable_ddl_transaction!
def up
add_column :merge_request_metrics, :pipeline_id, :integer
add_foreign_key :merge_request_metrics, :ci_commits, column: :pipeline_id, on_delete: :cascade # rubocop: disable Migration/AddConcurrentForeignKey
add_concurrent_index :merge_request_metrics, :pipeline_id
end
def down
remove_foreign_key :merge_request_metrics, column: :pipeline_id
remove_index :merge_request_metrics, :pipeline_id if index_exists? :merge_request_metrics, :pipeline_id
remove_column :merge_request_metrics, :pipeline_id
end
end
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