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class Student extends AppModel {
    public $hasMany = array(
        'Course' => array(
            'className' => 'Course',
            'foreignKey' => 'student_id'
        ),
        'StudentCourse' => array(
            'className' => 'StudentCourse',
            'foreignKey' => 'student_id'
        ),
        'StudentProficiency' => array(
            'className' => 'StudentProficiency',
            'foreignKey' => 'student_id'
        )
    );
}
 
 
class StudentCourse extends AppModel {
 
    public $belongsTo = array(
        'Student' => array(
            'className' => 'Student',
            'foreignKey' => 'student_id'
        ),
        'Course' => array(
            'className' => 'Course',
            'foreignKey' => 'course_id'
        )
    );
}
 
class Course extends AppModel {
 
 
    public $belongsTo = array(
        'Student' => array(
            'className' => 'Student',
            'foreignKey' => 'student_id'
        )
    );
 
    public $hasMany = array(
        'StudentCourse' => array(
            'className' => 'StudentCourse',
            'foreignKey' => 'student_id',
            'dependent' => false
        ),
    );
 
    public $hasAndBelongsToMany = array(
        'Student' => array(
            'className' => 'Student',
            'joinTable' => 'student_courses',
            'foreignKey' => 'course_id',
            'associationForeignKey' => 'student_id',
            'unique' => true
        )
    );
 
}
 
class CoursesController extends AppController {
 
    public function view($id = null) {
        $course = $this->Course->findById($id);
        if (!$course) {
            throw new NotFoundException(__('Invalid course'));
        }
        $this->set('course', $course);
     }
 
}