How to specify pivot table for hasOne() relationship in Laravel

Question

I have a couple of models that I have included pivot tables for to avoid a polymorphic relation.

role table
id
name
description

restriction table
id
rule
status

restriction_role table
id
restriction_id
role_id

Reason for this setup is that both Roles and Restrictions can actually belong to multiple other models. In this case, a Role can only have 1 Restriction. I would normally define this as

class Role extends Eloquent {
    public function restrictions()
    {
        return $this->hasOne('Restriction');
    }
}

This obviously does not work because Laravel is unaware of the pivot table connecting this relation. I could easily accomplish this by using a many-to-many relationship instead, but this is not exactly how my model works. Not seeing anything in the documentation for defining this. Any thoughts?

Answer 1

I've solved this by using the belongsToMany relation and defining a custom accessor for it, like so:

public function foo()
{
    return $this->belongsToMany(App\Bar::class);
}

public function getFooAttribute()
{
    return $this->foo()->first();
}

Answer 2

As @deczo stated in the comments, belongsToMany() is about all that will work here. I recommend returning the first result using the first() method if you require only one result but cannot use a hasOne() relationship.