How to implement a self referencing (parent_id) model in cakephp

Question

I have a table called categories. The table holds categories and their sub(subsub)categories...

Its an easy table:

• id
• parent_id
• title

Answer 1

RichardAtHome's answer is the right one. In CakePHP 3.+ you write:

     $this->hasMany('Children', [
            'className'=>'Category',
            'foreignKey'=>'parent_id'
     ]);

    $this->belongsTo('Parent', [
        'className'=>'Category',
        'foreignKey'=>'parent_id'
    ]);

and don't forger to use 'contain' in your 'find', e.g.:

        $categories = $this->find("all")
           ->order(...)
           ->contain(['Children']);