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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 MergeRequestsSourceProjectIdForeignKey < ActiveRecord::Migration
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
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