Display elements on second level relationship in Nova Laravel using indexQuery - laravel-nova

Question

I've 3 models
User has a hasmany relation (domains()) with Domain and this hasMany relation (mailboxes) with Mailbox
User.php
public function domains()
{
return $this->hasMany(Domain::class);
}
Domain.php
public function user()
{
return $this->belongsTo(User::class);
}
public function mailboxes()
{
return $this->hasMany(Mailbox::class, 'domain', 'domain');
}
Mailbox.php
public function domains()
{
return $this->belongsTo('App\Domain', 'domain', 'domain');
}
Code below work fine for get only mailboxes owned but if put in policies not work.
public function view(User $user, Mailbox $mailbox)
{
$domains = Domain::where('user_id', $user->id)->pluck('domain')->toArray();
return User::with([
'domains.mailboxes' => function ($builder) use ($domains) {
$builder->where('domain',$domains);
}
])->find($user);
}
I tried overrinding indexQuery on my Nova/Mailbox model, but not work. Retunr all mailboxes on database
public static function indexQuery(NovaRequest $request, $query)
{
$domains = Domain::where('user_id', $request->user()->id)->pluck('domain')->toArray();
return User::with([
'domains.mailboxes' => function ($builder) use ($domains) {
$builder->where('domain',$domains);
}
])->find($user);
if ($request->user()->is_super_admin) {
return $query;
} else {
return User::with([
'domains.mailboxes' => function ($builder) use ($domains) {
$builder->where('domain',$domains);
}
])->find($user);
}
}

Answer 1

I would add a hasManyThrough (documentation) relationship between User and Mailbox so you can pluck the mailboxes directly from the User model:
# Inside User model class
public function mailboxes()
{
return $this->hasManyThrough(Mailbox::class, Domain::class, 'user_id', 'domain', 'id', 'domain');
}
Then in your indexQuery you could return the user with all its mailboxes:
public static function indexQuery(NovaRequest $request, $query)
{
return $query->when(! $request->user()->is_super_admin, function ($builder) use ($request) {
// Or use the request() method helper instead of use
return $request->user()->with('mailboxes');
});
}