Get relationship from another relationship with Eloquent and Laravel 8 - laravel

Question

I try to get Address with Country's name, which belongs to InvoiceData. Invoice Data belongs to Personal or Business Profile. Last condition was made with morphTo() Laravel's feature.
Simplified db structure:
personal_profiles:
id, name
invoice_data:
id, address_id, invoiceable_id, invoiceable_type
addresses:
id, country_id, postal_code, city
countries
id, name
Then models:
class UserProfile extends Model
{
public function invoiceData()
{
return $this->morphOne(InvoiceData::class, 'invoiceable');
}
}
class InvoiceData extends Model
{
public function imageable()
{
return $this->morphTo();
}
public function address()
{
return $this->belongsTo(Address::class)->with(Country::class);
}
}
class Address extends Model
{
public function country()
{
return $this->belongsTo(Country::class);
}
}
class Country extends Model
{
public function address()
{
return $this->hasMany(Address::class);
}
}
And the Controller:
public function getPersonalInvoiceData()
{
/** #var User $user */
$user = \Auth::user();
/** #var UserProfile $profile */
$profile = $user->userProfile;
/** #var InvoiceData $invoiceData */
$invoiceData = $profile->invoiceData;
/** #var Address $address */
$address = $invoiceData->address;
//$address = $invoiceData->address()->with(Country::class)->get();
$responseData = [
'name' => $user->name,
'surname' => $user->surname,
'address' => $address,
];
return response()->json($responseData);
}
There is no problem with get address:
"address": {
"id": 1,
"country_id": 171,
"city": "Foo City",
"postal_code": "00-100",
}
But I don't know how to "replace" country_id with related name using Eloquent. As you can see, I tried to use with() on but I got the exception with message: Call to undefined relationship [App\\Models\\Country] on model [App\\Models\\Address]. I thought that relations I mentioned are enough. For what did I forgot?

Answer 1

You shouldn't use class in "with" there should be the relation name but I think you don't want to use with method because it will get all countries when you call get method.
All you have to do is:
$address = $invoiceData->address->load('country');