Question

i have two models. Batch and Subject. The relation between them are Batch HAS_MANY Subjects. The problem is that three subject are MUST and for all batches. How can i implement this fixed values (the three subjects) in the model?

Answer 1

If you really don’t want to store the 3 default subjects in the database, you could write a function that returns the default subjects combined with any subjects that are actually related to the Batch object.

Assuming your relation is called ‘subjects’:

class Batch extends CActiveRecord
{
  ...
  public function getAllSubjects()
  {
    $subject1 = new Subject;
    ...
    $subject2 = new Subject;
    ...
    $subject3 = new Subject;
    ...
    return array($subject1, $subject2, $subject3) + $this->subjects;
  }

The limitation is that you can’t reference the default subjects in database criteria, and you have to make sure to use $model->allSubjects instead of $model->subjects