get('user_id')); $user = User::query()->with('customer')->find($userId); return [ 'user_id' => [ 'required', 'string', 'maxLength:50', function ($attribute, $value) use ($user) { if (empty($user)) { return __('User not found.', 'fluent-cart'); } if (!empty($user->customer)) { return (__('User already linked to a customer.', 'fluent-cart')); } return null; } ], ]; } /** * @return array */ public function messages(): array { return [ 'user_id.required' => esc_html__('User is required.', 'fluent-cart'), 'user_id.exists' => esc_html__('User not found.', 'fluent-cart'), ]; } /** * @return array */ public function sanitize(): array { return [ 'user_id' => 'absint', ]; } }