Repeating Many-To-Many Relations

Question

I have one entity Order and one entity Product .

It should be possible to add one product several times to an order, but with Doctrines default many-to-many-relation there can be only one relation in the join-table . Is there a way to solve this without an extra entity and two one-to-many-relations ?

Answer 1

Why add a Product many times to an Order? Make it a many-to-many relation with a Quantity column added to it. One Product with a Quantity of N should satisfy your wish.

Answer 2

No, you need an OrderLine table. Many-to-Many can exist conceptually, but in a relational database you can't. You have to break it into two Many-to-one relationships