How to Work with Doctrine Associations / Relations (Symfony Docs)
There are two main relationship/association types: ManyToOne / OneToMany The most common relationship, mapped in the database with a foreign key column (e.g. a category_id column on the product table). This is actually only one association type, but seen from the two different sides of the relation. ManyToMany Uses a join table and is needed when both sides of the relationship can have many of the
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YAML Mapping - Doctrine Object Relational Mapper (ORM)
