QueryToMany, QueryToOne, HasMany, HasOne, BelongsTo and BelongsToMany may fail to find a relation if declared with resolveRelationUsing #288
Description
If you add a relation to a model via the Model::resolveRelationUsing() method (https://laravel.com/docs/11.x/eloquent-relationships#dynamic-relationships) the getRelation() methods in QueryToMany, QueryToOne, HasMany, HasOne, BelongsTo and BelongsToMany don't recognize it as they use method_exists to check if it's available, whereas the relations created this way are only available to the instance and when checked with relationResolver
So for instance in QueryToMany.php
`
/**
* @return EloquentRelation
*/
private function getRelation(): EloquentRelation
{
$name = $this->relation->relationName();
assert(method_exists($this->model, $name), sprintf(
'Expecting method %s to exist on model %s',
$name,
$this->model::class,
));
`
should be changed to something like the following:
`
/**
* @return EloquentRelation
*/
private function getRelation(): EloquentRelation
{
$name = $this->relation->relationName();
assert(method_exists($this->model, $name) || $this->model->relationResolver($this->model::class, $name), sprintf(
'Expecting method %s to exist on model %s',
$name,
$this->model::class,
));
`
This way it will also work for relations declared with resolveRelationUsing