How to do the reverse side of joins?

Question

Ruby on Rails

Friends, help! The task is simple along the way, but I can not finish it. and I can't find it in the documentation.
There is, for example, such a thing:
expired_order=Order.joins(:order_expired)
If the application has expired, then a new OrderExperied is added to the database, which has a belongs_to to the Order model.
That is, this code will display all orders that have an attached OrderExperied.
but I need the opposite to display all tasks that do NOT have an attached OrderExperied.
To be something like this:
expired_order=Order.joins.not(:order_expired)
How to implement this correctly?

Answer 1

Order.includes(:order_expired).where(order_expireds: { order_id: nil })

dig this way