[Laravel] LinksHandler does not properly handle a `MorphOneOrMany` relationship

[jonerickson]

API Platform version(s) affected: 4.1.15

Description
When trying to get a collection of related models via a polymorphic relationship, the query is not scoped to model parent class.

Structure:

Model 1: Project
Property: attachments(): MorphMany

Model 2: Attachment

How to reproduce
Create an operation for the nested resource:

new GetCollection(
    uriTemplate: '/projects/{id}/attachments',
    uriVariables: [
        'id' => new Link(
            fromProperty: 'attachments',
            fromClass: Project::class,
        ),
    ],
),

Dump the query:

select * from `attachments` where `attachments`.`model_id` = ?

This query will return all Attachments with the provided model ID, even if the model_type is incorrect.

A properly scoped Morph relationship should output the following to account for other model classes with the same model ID:

select * from `attachments` where `attachments`.`model_type` = ? and `attachments`.`model_id` = ? and `attachments`.`model_id` is not null

This is the output of: $project->attachments()->toSql()

Possible Solution

Add the following to LinksHandler on L111:

if ($relationQuery instanceof MorphOneOrMany) {
    return $builder
        ->where($relationQuery->getForeignKeyName(), $identifier)
        ->where($relationQuery->getMorphType(), $relationQuery->getMorphClass());
}