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Symfony2 – Franz Jordán 2011
Finally, now that you've added a new property to both the Category and Product classes, tell
Doctrine to generate the missing getter and setter methods for you:
php app/console doctrine:generate:entities Acme
Ignore the Doctrine metadata for a moment. You now have two classes -
Category and Product with a natural one-to-many relationship. The Category class holds an
array of Product objects and theProduct object can hold one Category object. In other words -
you've built your classes in a way that makes sense for your needs. The fact that the data needs
to be persisted to a database is always secondary.
Now, look at the metadata above the $category property on the Product class. The information
here tells doctrine that the related class is Category and that it should store the id of the
category record on a category_id field that lives on the product table. In other words, the
related Category object will be stored on the $category property, but behind the scenes,
Doctrine will persist this relationship by storing the category's id value on a category_id column
of the product table.
The metadata above the $products property of the Category object is less important, and
simply tells Doctrine to look at the Product.category property to figure out how the
relationship is mapped.
Before you continue, be sure to tell Doctrine to add the new category table,
andproduct.category_id column, and new foreign key:
php app/console doctrine:schema:update --force
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