Saving Post hasMany Student habtm Subject in Cakephp

Question

I'm trying to save 3 tables of data from PostController and their relationships are as follow:

Post hasMany Student
Student hasAndBelongsToMany Subject

In posts/ I have a multistep form, in the first step of which I have these inputs to save students:

$this->Form->input('Student.0.name');
$this->Form->input('Student.1.name'); //an additional field that maybe added by the user

In the last step, I count the number of students input by the user in step 1 and then output the inputs for subjects accordingly like this:

$this->Form->input('Subject.0.name'); //Subject(s) for student 1
$this->Form->input('Subject.1.name'); //Subject(s) for student 2

But I don't know how to set the field names in Cakephp to save the subjects for each students in Post model.

Answer 1

I figured it out:

foreach ($this->session->data['Student'] as $key => $value) {
    $val = 'Student.' . $key . '.Subject';
    echo $this->Form->input($val);
}

The field names for subject inputs (submitting from Post model) should be: Student.0.Subject . And I output the inputs using foreach loop so it's ready for any number of fields added by the user, and each fields correspond to respective student.