Модель CodeIgniter возвращает «Невозможно добавить или обновить дочернюю строку: ограничение внешнего ключа не выполнено»

Question

Error Number: 1452

Cannot add or update a child row: a foreign key constraint fails (`hrmates_db`.`leave_request`, CONSTRAINT `leave_request_ibfk_2` FOREIGN KEY (`reporting_manager_id`) REFERENCES `employee_details` (`employee_id`))

INSERT INTO `leave_request` (`employee_id`, `number_of_days`, `start_date`, `end_date`, `requested_date`, `reason`, `status`, `request_id`, `reporting_manager_id`) VALUES ('Fahad', '183', '2018-10-15', '2019-04-15', '2018-09-13 01:41:02', 'Casual Leave', 'submitted', 'KPRR651398', '')

Filename: C:/wamp/www/HRMATES/application/models/Database_models.php

Line Number: 389

Моя модель:

    public function insert_leave_request($insert_data)
    {
        $output[TAG_QUERY_RESPONSE] = QUERY_FAILURE;
        $insert_data[TAG_REQUEST_ID] = $this->Utility_models->get_id('leave_request',TAG_REQUEST_ID);
        $this->db->select('*');
        $qr =$this->db->get_where('employee_details',array('employee_id'=>$insert_data[TAG_EMPLOYEE_ID]))->row();
        $insert_data[TAG_REPORTING_MANAGER_ID]= $qr->reporting_manager_id;
        $output[TAG_HR_MANAGER_ID]= $qr->hr_manager_id;
        $output[TAG_REPORTING_MANAGER_ID]= $qr->reporting_manager_id;
        $output[TAG_REQUEST_ID]= $insert_data[TAG_REQUEST_ID];
        $result = $this->db->insert('leave_request',$insert_data);

        if($result)
        {
            $output[TAG_QUERY_RESPONSE] = QUERY_SUCCESS;
        }
        return $output;
}

Контроллер

 function insert_leave_request()
    {

        $data[TAG_STRING] = '';
        $insert_data[TAG_EMPLOYEE_ID] = $this->input->post(TAG_EMPLOYEE_ID);
        $insert_data[TAG_NUMBER_OF_DAYS] = $this->input->post(TAG_NUMBER_OF_DAYS);
        $insert_data[TAG_START_DATE] = $this->input->post(TAG_START_DATE);
        $insert_data[TAG_END_DATE] = $this->input->post(TAG_END_DATE);
        $insert_data[TAG_REQUESTED_DATE] = date('Y-m-d h:i:s');
        $insert_data[TAG_REASON] =  $this->input->post(TAG_REASON);
        $insert_data[TAG_STATUS] =  TAG_SUBMITTED;



        $result_insert_leave=$this->Database_models->insert_leave_request($insert_data);
        if($result_insert_leave){

            $message_data[TAG_EMPLOYEE_ID] = $this->input->post(TAG_EMPLOYEE_ID);
            $message_data[TAG_DATE] = date('Y-m-d h:i:s');
            $message_data[TAG_MESSAGE] = STR_LEAVE_REQUEST;
            $message_data[TAG_TO_ID] = $result_insert_leave[TAG_REPORTING_MANAGER_ID];
            $message_data[TAG_TABLE_REFERENCE] =TAG_LEAVE_REQUEST;
            $message_data[TAG_STATUS] =1;
            $message_data[TAG_REFERENCE_ID] =$result_insert_leave[TAG_REQUEST_ID];

            $result_insert_message1=$this->Database_models->insert_meassage($message_data);

            $message_data[TAG_TO_ID] = $result_insert_leave[TAG_HR_MANAGER_ID];
            if($result_insert_message1) {


                $result_insert_message2 = $this->Database_models->insert_meassage($message_data);


                if ($result_insert_message2) {
                    redirect(base_url() . 'leave_request/1');
                }
            }
        }
        redirect(base_url() . 'leave_request');

    }