40 lines
988 B
Ruby
40 lines
988 B
Ruby
|
# See http://doc.gitlab.com/ce/development/migration_style_guide.html
|
||
|
# for more information on how to write migrations for GitLab.
|
||
|
|
||
|
class IssuesMilestoneIdForeignKey < ActiveRecord::Migration
|
||
|
include Gitlab::Database::MigrationHelpers
|
||
|
|
||
|
# Set this constant to true if this migration requires downtime.
|
||
|
DOWNTIME = false
|
||
|
|
||
|
disable_ddl_transaction!
|
||
|
|
||
|
class Issue < ActiveRecord::Base
|
||
|
include EachBatch
|
||
|
|
||
|
self.table_name = 'issues'
|
||
|
|
||
|
def self.with_orphaned_milestones
|
||
|
where('NOT EXISTS (SELECT true FROM milestones WHERE milestones.id = issues.milestone_id)')
|
||
|
.where('milestone_id IS NOT NULL')
|
||
|
end
|
||
|
end
|
||
|
|
||
|
def up
|
||
|
Issue.with_orphaned_milestones.each_batch(of: 100) do |batch|
|
||
|
batch.update_all(milestone_id: nil)
|
||
|
end
|
||
|
|
||
|
add_concurrent_foreign_key(
|
||
|
:issues,
|
||
|
:milestones,
|
||
|
column: :milestone_id,
|
||
|
on_delete: :nullify
|
||
|
)
|
||
|
end
|
||
|
|
||
|
def down
|
||
|
remove_foreign_key_without_error(:issues, column: :milestone_id)
|
||
|
end
|
||
|
end
|