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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 IssuesMilestoneIdForeignKey < ActiveRecord::Migration[4.2]
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
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