How to iterate and add a "random" key/value to an existing object using hasMany

Question

Using the with method, I do not see anything near, on the docs, as to what I want to accomplish. Possible?

// bars is a hasMany() association

public function getFoo($id, $fooId)
{
    return $this
        ->where('id', $id)
        ->where('fooId', $fooId)
        ->with([
            'one',
            'two',
            'bars' => function($queries) {
                foreach ($queries as $key => $query) {
                    $queries[$key]['extraKey'] = 'extraValue'; // extrakey can be any name I want it to be.
                    // $query['extraKey'] = "extraValue";
                }
            }
        ])
        ->first();
}

I'm following Vlad's answer how to loop and modify but I'm not seeing extraKey in the returned data.

Do I have perform this action in the controller? Seems messy if that's the only way. I thought I could so these actions within the model itself.

I expect to see:

foo->bars[0]->extrakey;

Answer 1

You could make use of accessors in your Bar model:

class Bar extends Model
{
    // ...

    public function getExtraKeyAttribute()
    {
        return 'extraValue';
    }

    // ...
}

Additionally, if you want to include this value in the toArray output, add it the protected $appends property of your model:

class Bar extends Model
{    
    protected $appends = ['extra_key'];