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class ChangeProjectToPolymorphicRelationshipOnLabels < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = true
DOWNTIME_REASON = 'This migration renames an existing column'
disable_ddl_transaction!
def up
rename_column :labels, :project_id, :subject_id
add_column :labels, :subject_type, :string
update_column_in_batches :labels, :subject_type, 'Project'
add_concurrent_index :labels, :subject_type
end
def down
rename_column :labels, :subject_id, :project_id
remove_column :labels, :subject_type
end
end
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