Laravel -在同一模型上既有hasMany()又有hasOne()关系？

use Illuminate\Database\Eloquent\Model;

class User extends Model
{
    public function comments()
    {
        return $this->hasMany(Comment::class);
    }

    public function address()
    {
        return $this->hasOne(Address::class);
    }

    public function profile()
    {
        return $this->morphTo();
    }
}

use Illuminate\Database\Eloquent\Model;

class Comment extends Model
{
    public function user()
    {
        return $this->belongsTo(User::class);
    }
}

use Illuminate\Database\Eloquent\Model;

class Address extends Model
{
    public function user()
    {
        return $this->belongsTo(User::class);
    }
}

$user = User::find(1);
$comments = $user->comments;
$address = $user->address;