Add the edit option

Hi guys, I'm working on a codeigniter template ( https://codecanyon.net/item/class-ease-e...m/29109477 )

This template is for a school and I have a problem :



I must have the possibility to modify the fees owed by the students, the fact of being able to edit is available for most objects (courses, teachers, students etc ...). But you cannot edit the payments due. So I started to set this system up, I added the edit button but the data is not saved, do you know where I can change that?





StudentsDues Controller

PHP Code:

public function save()
    {
        $this->checkIfDemo();
        $this->form_validation->set_rules('amount', 'Amount', 'trim|required|numeric');
        $this->form_validation->set_rules('description', 'Description', 'trim|required|min_length[2]|max_length[50]');

        $edit = $this->xssCleanInput('student_due_id') ? $this->xssCleanInput('student_due_id') : false;

        if ($edit && $this->form_validation->run() === FALSE) {
            echo json_encode(array(
                'success' => 'false',
                'messages' => $this->ajaxErrorMessage(array('error' => validation_errors()))
            ));
        } else {
            $data = $this->AdminStudentDueModel->storeStudentDue();
            echo json_encode(array(
                'success' => 'true',
                'messages' => $this->ajaxErrorMessage(array('success' => lang('student_due') . ($edit ? lang('updated') : lang('created')))),
                'data' => $data.' '.lang('student_dues_created'),
            ));

        }
    } 


Courses Controller

PHP Code:

public function save()
    {
        $this->checkIfDemo();
        $this->form_validation->set_rules('title', 'Title', 'trim|required|min_length[2]|max_length[50]');
        $this->form_validation->set_rules('code', 'Code', 'trim|required|min_length[2]|max_length[50]');
        $this->form_validation->set_rules('description', 'Description', 'trim|required|min_length[10]|max_length[5000]');

        $edit = $this->xssCleanInput('course_id') ? $this->xssCleanInput('course_id') : false;

        if ($this->form_validation->run() === FALSE) {
            echo json_encode(array(
                'success' => 'false',
                'messages' => $this->ajaxErrorMessage(array('error' => validation_errors()))
            ));
        } elseif ($this->AdminCourseModel->valueExist('code', $this->xssCleanInput('code'), $edit)) {
            echo json_encode(array(
                'success' => 'false',
                'messages' => $this->ajaxErrorMessage(array('error' => lang('code_already_exist')))
            ));
        } else {
            $data = $this->AdminCourseModel->storeCourse($edit);
            echo json_encode(array(
                'success' => 'true',
                'messages' => $this->ajaxErrorMessage(array('success' => lang('course') . ($edit ? lang('updated') : lang('created')))),
                'data' => $data
            ));
        }
    } 


Thanks !