[SOLVED] Laravel Validating Route Parameters

If you plan to do this directly in your controller method you can do something like:

public function getUser(Request $request)
    {
        $request->merge(['id' => $request->route('id')]);
        $request->validate([
            'id' => [
                'required',
                'exists:users,id'
            ]
        ]);
    }

To do this in a custom FormRequest class, add the following:

protected function prepareForValidation() 
    {
        $this->merge(['id' => $this->route('id')]);       
    }

or if you use model binding, example is Post, then

protected function prepareForValidation() 
    {
        $this->merge(['id' => $this->route('post')]);       
    }

And in your rules method:

public function rules()
    {
        return [
            'id' => [
                'required',
                'exists:post,id'
            ]
        ];
    }

References:

https://stackoverflow.com/questions/29578153/how-to-validate-route-parameters-in-laravel-5