Framework: [Request] Polymorphic exists validation

[dwightwatson]

I'd love to see another exists validation rule that works for polymorphic objects. For example if a form is getting messageable_id and messageable_type, it would be great to ensure the object that is being referred to actually exists.

[taylorotwell]

You can set extra where conditions on the exists rule. See documentation.

[windwardrail]

In the documentation, it shows that you can add a where clause to the exists rule. I'm not really sure how that helps in this case since it looks like you still need to specify a single table to look in as the first argument to the exists rule.

[seijimanoan]

It's like the $table-> morphs () creates index keys instead of unique keys. Why doesn't it care for?

[meness]

Any solution please?

[omarjebari]

You can dynamically define a 'model_exists' rule in your request class. Something like this:

public function rules()
{
    $messageableIdRule = 'required_with:messageable_type';
    if ($this->has('messageable_type')) {
        $messageableIdRule .= '|model_exists:' . $this->messageable_type . ',id';
    }
    return [
        'messageable_type' => 'required_with:messageable_id',
        'messageable_id' => $messageableIdRule,
    ];
}