What is the function of table linking in Eloquent ORM Laravel?

Question

Laravel

I understand laravel ORM. I do not understand how to link tables? An analogue of joins. Let's say I have such a request

SELECT * FROM users as u left JOIN clients2adverts as c on u.id = c.id_client 
      left JOIN adverts as a ON c.id_adverts = a.id_realty
          WHERE c.lead = 1 and u.activated = 1 or u.id_role = 2

How can I rewrite it using ORM?

Answer 1

https://laravel.com/docs/5.2/queries#joins
There is no function for linking tables in ORM, since ORM operates with objects, and their links are described in the model class and are generated automatically.

Answer 2

https://laravel.com/docs/5.2/eloquent-relationship...
in a model class, relationships define methods like hasMany(), hasOne(), belongsTo()
Documentation example:
belongsTo takes three parameters, the last two are optional ( needed if you want to override keys), see the EloquentORM documentation, link above.

public function user()
{
    return $this->belongsTo('App\User', 'foreign_key', 'other_key');
}