Laravel 4表关系雄辩

Question

I have four tables:

Users: id, username
Roles: id, name
Domains id, title
DomainsAssignedRolesUsers id, role_id, user_id, domain_id

I want to get all user roles for a domain.

I do:

User::find(1)->domains->first()->roles

But i get all domains roles, not only for my user. Help me to get user roles only for the selected domain/

My relations:

// User model:

public function rolesDomain() {
    return $this->belongsToMany('Role', 'domainsAssignedRolesUsers', 'user_id', 'role_id');
}

public function domains() {
    return $this->belongsToMany('Domain', 'domainsAssignedRolesUsers');
}

---

// Role model:

public function domains() {
    return $this->belongsToMany('Domain', 'domainsAssignedRolesUsers');
}

---

// Domain model:

public function roles() {
    return $this->belongsToMany('Role', 'domainsAssignedRolesUsers', 'domain_id', 'role_id');
}

public function users() {
        return $this->belongsToMany('User', 'domainsAssignedRolesUsers', 'domain_id', 'user_id');
    }

Answer 1

You want to get all the roles, from a specific domain, in relation with an user?

So this should do the trick:

User::find(1)->rolesDomain()->where('domain_id', $specificID)->get()

But if you want to only get the roles from the first domain for an user.

User::find(1)->domains()->first()->roles()->get();

And if you only want to retrieve the roles for a user.

User::find(1)->rolesDomain()->get() 

And if you only want to retrieve all the roles from each domain in relation with an user.

User::find(1)->domains()->with('roles')->get()

Even if Eloquent documentation has a few example, This orm is really intuitive.

Answer 2

Check out Eloquent Triple Pivot (also on Packagist), it sounds like it does exactly what you want.

You'd set up your Models as User , Domain and Role (a User has many Domain s and can have a Role in each). Then look at the docs on the Github page (particularly step 6), and you'd define this on your Domain model:

class Domain extends Eloquent {
    ...
    public function getRolesAttribute() {
        return $this->getThirdAttribute();
    }
}

Then you can simply call

$user = User::find(1);

$domain = $user->domains->first();
// or
$domain = $user->domains->find(73);

$roles = $domain->roles;

// Or the above can be condensed into just...
$roles = User::findOrFail( 1 )
             ->domains()
             ->findOrFail( 73 )
             ->roles;