I am using Doctrine "in reverse" in that I have some legacy code that I am
refactoring,
and I am fitting in Doctrine to be on top of already existing tables.
So for example I have a table like so:
item(id, description, motor_id, product_id, drive_id);
I also have the corresponding tables for each of the foreign keys (not
shown).
I have defined most but not all entities for the tables. For example, I
have one for the Product, but not for Motor or Drive.
I have noted that Using Doctrine, I can (for product_id, as an example):
1. just leave it as an integer, without setting up an Entity
2. set up a ManyToOne connection for the Product foreign key and treat
that property as an Entity
*Caveats*
.. I have tried some of this and I have found that using Entity so far can
be a bit of an inconvenience.
Example without Entity: I have code like so:
$productId = 44; //already known in the code
$db->query("update item set description = '...', product_id = $productId
where id = $id;");
Transforming the above to Doctrine is easy enough. And without an Entity
for $productId property, product_id becomes just another thing to set, like
so:
$item->setProductId($productId);
But when using an Entity instead there's a bit more work to be done. I use
something like so
//since $productId is already known I don't want to read it from DB again,
so I use getReference()
$product = $this->em->getReference(Product::class, $productId);
$item->setProduct($product);
*Question*
In the grand scheme of things, I presume Doctrine will advocate the
approach of using Entities for foreign keys (sometimes at the expense of
setting up extra Proxies like above, or even just using $this->em->find(),
to populate the foreign key Entity)
But, when I already have legacy code that's using known foreign keys, is
using Entities worth it?
aka the legacy code already has the plumbing for integer keys, and
rewriting for Entities will take a bit of work. I am seeking some
justification for that work, other than "It's the Doctrine Way, make it so".
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