Add user email unique to CreateUserRequest only

app/Http/Requests/CreateUserRequest.php

@@ -25,6 +25,8 @@ class CreateUserRequest extends FormRequest
      */
     public function rules()
     {
-        return User::$rules;
+        $rules = User::$rules;
+        $rules['email'] .= '|unique:users,email';
+        return $rules;
     }
 }