Conversion 的 toArray优化/bug

重现代码：

$goods                       = GoodsModel::with($with)->find($goods_id);			
$goods['goods_detail_media'] = $goods['goods_media']->where('from', 4)->values();
$goods['goods_media']        = $goods['goods_media']->where('from', 1)->values();

我在上面的with关联查询中，查询了goods_media关联数据，查询出来以后，我再将goods_media数据进行拆分，将from 1和4分别放到不同的属性中，但是goods['goods_media']，在toArray输出goods对象之前，我发现返回的goods['goods_media']数据是对的。这个属性在toArray输出后，返回的还是关联数据，并不是我过滤后的数据

查询代码发现在trait Conversion文件的toArray函数中，

$data = array_merge($this->data,$this->relation);

这导致relation的数据覆盖了我data中的数据，就导致了我的赋值不生效

改为
$data = array_merge($this->relation,$this->data);
后，解决了我的问题

Start in the Conversion trait's toArray function and inspect how $data and $relation are merged. Reproduce the GoodsModel relation example, then verify that the filtered goods_media values remain in the toArray output and that the existing behavior is covered or confirmed by the relevant ORM tests.