How to Create Many-to-Many Link Tables with Extra Fields in Doctrine 2?

Doctrine 2 and Many-to-many Link Table with an Extra Field

This article addresses the issue of creating a many-to-many relationship in Doctrine 2 where the link table includes an additional value, specifically in the context of a stock-keeping system.

Many-to-many relationships in Doctrine 2 can be established using a link table that does not contain any additional fields. However, when an extra value is needed for each link, the link table must be redefined as a new entity.

The provided code example demonstrates a revised database model that includes a dedicated Stock entity with relationships to Store and Product, accompanied by the corresponding Doctrine 2 annotations. This allows for the storage and retrieval of the amount field within the stock-keeping system.

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