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class AddGroupToTodos < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
class Todo < ActiveRecord::Base
self.table_name = 'todos'
include ::EachBatch
end
def up
add_column(:todos, :group_id, :integer) unless group_id_exists?
add_concurrent_foreign_key :todos, :namespaces, column: :group_id, on_delete: :cascade
add_concurrent_index :todos, :group_id
change_column_null :todos, :project_id, true
end
def down
remove_foreign_key_without_error(:todos, column: :group_id)
remove_concurrent_index(:todos, :group_id)
remove_column(:todos, :group_id) if group_id_exists?
Todo.where(project_id: nil).each_batch { |batch| batch.delete_all }
change_column_null :todos, :project_id, false
end
private
def group_id_exists?
column_exists?(:todos, :group_id)
end
end
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