Creating student works. Need to work on validation rules

app/Http/Controllers/StudentController.php

@@ -5,11 +5,13 @@ namespace App\Http\Controllers;
 use App\Models\School;
 use App\Models\Student;
 use App\Models\User;
+use App\Rules\UniqueFullNameAtSchool;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Auth;
 use function abort;
 use function redirect;
 
+// TODO validation rules to make sure a student name is unique at a school
 class StudentController extends Controller
 {
     /**
@@ -37,7 +39,7 @@ class StudentController extends Controller
         if ($request->user()->cannot('create', Student::class)) abort(403);
         $request->validate([
             'first_name' => ['required'],
-            'last_name'  => ['required'],
+            'last_name'  => ['required', new UniqueFullNameAtSchool(request('first_name'),request('last_name'), Auth::user()->school_id)],
             'grade'      => ['required', 'integer'],
         ]);
 

app/Rules/UniqueFullNameAtSchool.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace App\Rules;
+
+use App\Models\Student;
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+
+class UniqueFullNameAtSchool implements ValidationRule
+{
+    protected $first_name;
+    protected $last_name;
+    protected $school_id;
+
+    public function __construct($firstName, $lastName, $schoolID)
+    {
+        $this->first_name = $firstName;
+        $this->last_name = $lastName;
+        $this->school_id = $schoolID;
+    }
+
+    public function passes($attributies, $value)
+    {
+        return Student::where('first_name', $this->first_name)
+            ->where('last_name', $this->last_name)
+            ->where('school_id', $this->school_id)
+            ->exists();
+    }
+
+    public function message()
+    {
+        return "There is already a student with that name at the school you are trying to add them to";
+    }
+    /**
+     * Run the validation rule.
+     *
+     * @param  \Closure(string): \Illuminate\Translation\PotentiallyTranslatedString  $fail
+     */
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        //
+    }
+}