Appending attributes

When serializing a model to JSON, Laravel can add custom attributes using the append method or appends property on the model. The query builder also supports this using the allowedAppends method and append query parameter.

##Basic usage

Consider the following custom attribute accessor. It won't be included in the model's JSON by default:

class User extends Model
{
    public function getFullnameAttribute()
    {
        return "{$this->firstname} {$this->lastname}";
    }
}

Using allowedAppends we can optionally include the given above append.

// GET /users?append=fullname

$users = QueryBuilder::for(User::class)
    ->allowedAppends(['fullname'])
    ->get();
// Will call `$user->append('fullname')` on the query's results

Of course you can pass a list of attributes in the request to be appended:

// GET /users?append=fullname,ranking