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class AddGroupToTodos < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
def up
add_column :todos, :group_id, :integer
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
return unless group_id_exists?
remove_foreign_key :todos, column: :group_id
remove_index :todos, :group_id if index_exists?(:todos, :group_id)
remove_column :todos, :group_id
execute "DELETE FROM todos WHERE project_id IS NULL"
change_column_null :todos, :project_id, false
end
private
def group_id_exists?
column_exists?(:todos, :group_id)
end
end
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