How to return different relation as the same name in an Api Resource

In my project I have set up multiple relationships like :

Model

public function foo() 
{ 
  return $this->hasMany(Bar::class);
}

public function fooSold() 
{ 
  return $this->hasMany(Bar::class)->where('sold', 1);
}

Controller

public function show()
{
  $bar = Bar::with('foo')->first();
  return new BarResource($bar);
}

public function showSold()
{
  $bar = Bar::with('fooSold')->first();
  return new BarResource($bar);
}

Resource

public function toArray($request)
return [
...
'foo' => Foo::collection($this->whenLoaded('foo')),
]

Returning the first function in my controller isn't any problem. But how would I return the second one under the same name as 'foo' in my resource ?

'foo' => Foo::collection($this->whenLoaded'fooSold')),
'foo' => Foo::collection($this->whenLoaded'foo')),

This works but doesn't seem like the right way to do it, since you have the same array keys twice.

What's the best way of doing this ?

via Chebli Mohamed