Using models relationships in Laravel Validation Rule 'Exists'

Question

Db schema

users
 -id
 -name
 -email
 ...

roles
 -id
 -name

User may have multiple roles and vice-versa (i already defined relationships in models)

pivot table

role_user
 -id
 -user_id
 -role_id

Validation rule trying to make: user_id must exist in users table and has role id = 4

//...
'user_id' => ['nullable', Rule::exists('users')->where(
                function ($query) { 
                    $query->whereHas('roles', 
                        function ($q) { 
                            $q->where('id', 4); 
                        }
                    );
                }
)], 
//...

Error message : "SQLSTATE[42S22]: Column not found: 1054 Unknown column 'has' in 'where clause' (SQL: select count(*) as aggregate from users where user_id = 0 and (has = roles))"

@MohammadaliMirhamed no, i would like to validate a string like "1", "2" received from api body request — Foued MOUSSI, Jan 30 '20 at 08:35
@MohammadaliMirhamed i want to make sure user_id exists in my users table and the user that has this id has a particular role — Foued MOUSSI, Jan 30 '20 at 09:12

score 6 · Accepted Answer · edited Jan 30 '20 at 09:46

6

I would use this. This will solve your problem, but i don't know either is the best way or not.

    use Validator; // on the top

    $validator = Validator::make($request->all(), [
        'user_id' => 'nullable|numeric|exists:users,id',
    ]);
    if ($validator->fails()) {            
        return response()->json($validator->errors(), 422);
    }
    $user = User::find($request->user_id);
    if(!$user || !$user->roles->first() || $user->roles->first()->id != 4) {
        return response()->json(['user_id'=>['You dont have permission.']], 422);
    }

Another way you can try

'user_id'  => [
            'nullable',
            'numeric',
            'exists:users,id',
            function ($attribute, $value, $fail) { 
                $editorsIDs = User::whereHas('roles', function ($q) {
                    $q->where('id', 4);
                })->pluck('id');

                if(! $editorsIDs->contains($value)) {                        
                    $fail('You dont have permission.');
                }}
            ]

edited Jan 30 '20 at 09:46

Foued MOUSSI

4,643
3
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answered Jan 30 '20 at 08:43

hasan05

904
5
22

'user_id' must exists in users table – Foued MOUSSI Jan 30 '20 at 09:01
how can i chain user_id validation with others attrs – Foued MOUSSI Jan 30 '20 at 09:14
there is another way may, you may try. updated on previous answer. – hasan05 Jan 30 '20 at 09:21
we could add by `$validator->errors()->add('field', 'Something is wrong with this field!');` I think. if you have time, have a look on laravel documentation. :) https://laravel.com/docs/5.8/validation and also, dont forget to "mark as accepted answer", If it solves your problem. :) – hasan05 Jan 30 '20 at 09:32

score 1 · Answer 2 · answered Jan 30 '20 at 09:27

I resolve it using

$usersWhereHasEditorRole = User::whereHas('roles', function ($q) {
     $q->where('id', 4);
})->pluck('id')->unique('id')->toArray();

$validator = Validator::make($request->all(), [
                'name' => 'required|alpha', // commun
                'email' => 'required|email|unique:users', // commun
                'password' => 'required|min:8|regex:/[a-z]/|regex:/[A-Z]/|regex:/[0-9]/|regex:/[@$!%*#?&]/', // commun
                'c_password' => 'required|same:password', // commun
                //...
                'user_id' => ['nullable', Rule::in($usersWhereHasEditorRole)],
                //...
]);


if ($validator->fails()) {
      return $this->sendError('Validation Error.', $validator->errors(), 400);
}

dd('passes');

Using models relationships in Laravel Validation Rule 'Exists'

2 Answers2