46 lines
1.4 KiB
Ruby
46 lines
1.4 KiB
Ruby
# See http://doc.gitlab.com/ce/development/migration_style_guide.html
|
|
# for more information on how to write migrations for GitLab.
|
|
|
|
class MergeRequestsSourceProjectIdForeignKey < ActiveRecord::Migration[4.2]
|
|
include Gitlab::Database::MigrationHelpers
|
|
|
|
# Set this constant to true if this migration requires downtime.
|
|
DOWNTIME = false
|
|
|
|
disable_ddl_transaction!
|
|
|
|
class MergeRequest < ActiveRecord::Base
|
|
include EachBatch
|
|
|
|
self.table_name = 'merge_requests'
|
|
|
|
def self.with_orphaned_source_projects
|
|
where('NOT EXISTS (SELECT true FROM projects WHERE merge_requests.source_project_id = projects.id)')
|
|
.where('source_project_id IS NOT NULL')
|
|
end
|
|
end
|
|
|
|
def up
|
|
# We need to allow NULL values so we can nullify the column when the source
|
|
# project is removed. We _don't_ want to remove the merge request, instead
|
|
# the application will keep them but close them.
|
|
change_column_null(:merge_requests, :source_project_id, true)
|
|
|
|
MergeRequest.with_orphaned_source_projects.each_batch(of: 100) do |batch|
|
|
batch.update_all(source_project_id: nil)
|
|
end
|
|
|
|
add_concurrent_foreign_key(
|
|
:merge_requests,
|
|
:projects,
|
|
column: :source_project_id,
|
|
on_delete: :nullify
|
|
)
|
|
end
|
|
|
|
def down
|
|
remove_foreign_key_without_error(:merge_requests, column: :source_project_id)
|
|
change_column_null(:merge_requests, :source_project_id, false)
|
|
end
|
|
end
|