Laravel model method with default value

There are two tables

• products
• pictures ( has product_id , priority)

in my Product model i can get all pictures with:

public function pictures(){
    return $this->hasMany('App\Picture');
}

Now i want to create a function to get the main pictures url (lowest priority value with product_id of picture), and if there is no result return a default value. I tried:

public function mainpicture(){
    $picture = $this->pictures()->orderBy('priority','desc')->first();
    if($picture == null)
        return 'default/default.png';
    return $picture->url;
}

This gives the error:

Relationship method must return an object of type Illuminate\Database\Eloquent\Relations\Relation

When returning a value it's never of the type Illuminate\Database\Eloquent\Relations\Relation but just an url. How can I make a method to get the mainpicture or a default value?

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