Fix enum IDs in association mappings

[michnovka]

Attempt to fix #10132

[michnovka]

@greg0ire please review, this fixes a very specific case where we are using complex associations to entities with one or more ID columns, one of which is an enum.

My original thought was to use identifierFlattener like this:

$associatedIdFlattened = $this->identifierFlattener->flattenIdentifier($targetClass, $associatedId);
$relatedIdHash         = implode(' ', $associatedIdFlattened);

here -

orm/lib/Doctrine/ORM/UnitOfWork.php

Line 2850 in 20d6c53

$relatedIdHash = implode(' ', $associatedId);

But when running tests, this created some issues and BC breaks. I this this fix is sufficient. Other cases (like a single enum ID not part of association) already use checks like this

[greg0ire]

Please squash your commits together and use a commit message as good as this one: 9d5ab4c
You can read the contributing guide to get guidelines rather than an example.

[greg0ire]

a very specific case where we are using complex associations to entities with one or more ID columns, one of which is an enum

In your test, all 3 entities have the enum appear in the primary key, is that required to reproduce the issue?

[michnovka]

@greg0ire

In your test, all 3 entities have the enum appear in the primary key, is that required to reproduce the issue?

It is not required, but I did like the complex structure of the example as it works through 2 levels of association instead of just one.

[michnovka]

I have reduced the example entity to a minimum and provided a nice commit message.

@greg0ire please review

[greg0ire]

Thanks @michnovka !