problem in form_validation using is_callable(), cannot passing data from controller

I separate all processing data models in libraries, the model is only used to handle data from the database only and the controller is specialized to control requests.

I get a problem when processing data in library_models because of the limitations of calling methods in model_joins, so I tried experimenting so that it became a method below.
controller:

PHP Code:

$this->form_validation->set_rules(
    'email',
    'Email',
    [
        'required',
        [
            'checkEmail',
            [
                $this->library_models->check_email($this->model_joins->user_campaign('user_email', $this->input->post('email'))) // problem here
            ]
        ],
        [
            'checkRole',
            [
                $this->library_models->check_role($this->model_joins->user_campaign('user_email', $this->input->post('email'))) // problem here
            ]
        ]
    ],
    [
        'checkEmail'    => 'Email not exists',
        'checkRole'    => 'Account is not activef'
    ]
); 


libraries:

PHP Code:

public function check_role($email){
    if ($email->user_role == 0) {
        return false;
    }
    return true;
} 


models:

PHP Code:

   public function user_campaign($key, $value)
    {
        return $this->db->query("
            SELECT *
            FROM (
                SELECT *
                FROM users
                WHERE $key = '$value'
            ) users_campaigns
            INNER JOIN campaigns
            ON users_campaigns.id = campaigns.id
        ")->row();
    } 


but the results failed, because the above method does not return any values so that it displays the message "Trying to get property 'user_role' of non-object".

please help me to solve this problem.