我想在 Laravel 集合中返回一些键和值

Question

I have two Models (Store, Product) and Relationship hasMany

public function products(){
   return $this->hasMany(Product::class);
}

And I want to return response collection, in class StoresCollection extends ResourceCollection

public function toArray($request)
    {
        return $this->collection->map(function ($item) {
            return [
                'id' => $item->id,
                'seller_id' => $item->seller_id,
                'store_product' =>  $item->products()->get(),
            ];
        });
    }

But I don't want to return every key in the "store_product", I just need "id" and "is_featured" only, and I don't want them all.

{
    "status": "success",
    "message": [],
    "code": 200,
    "data": [
        {
            "id": 5,
            "seller_id": 6,
            "store_product": [
                {
                    "id": 1017,
                    "seller_id": 89,
                    "is_featured": 0,
                    "is_category_featured": 0,
                    "is_approved": 1,
                    "created_at": "2020-4-21T00:00:00.000000Z",
                    "updated_at": "2020-4-21T00:00:00.000000Z"
                }
            ]
        },
        {
            "id": 5,
            "seller_id": 6,
            "store_product": [
                {
                    "id": 1018,
                    "seller_id": 89,
                    "is_featured": 0,
                    "is_category_featured": 0,
                    "is_approved": 1,
                    "created_at": "2020-4-21T00:00:00.000000Z",
                    "updated_at": "2020-4-21T00:00:00.000000Z"
                }
            ]
        },
    "paging": {
        "total": 2,
        "per_page": 15,
        "current_page": 1,
        "last_page": 1,
        "from": 1,
        "to": 2
    }
}

Answer 1

It's possible to request only some columns by get() method, in your case like:

'store_product' =>  $item->products()->get(['id', 'is_featured']),

Answer 2

Create a Resource for store_product eg StoreProductResource and define the keys in the toArray() method.

Then come back and modify StoreCollection::toArray() like this:

 return $this->collection->map(function ($item) {
            return [
                'id' => $item->id,
                'seller_id' => $item->seller_id,

                'store_product' =>  StoreProductResource::collection($item->products()->get()),
            ];
        });

I also believe the callback map is unnecessary in your use case. toArray() just needs to return an array. Laravel handles the mapping. Except there's some logic you're doing in the callback which isn't included in the same code.

Answer 3

You can define your keys that you want to return in relationship as well:

public function products(){
   return $this->hasMany(Product::class)->select(['store_id','id', 'is_featured']);
}

Note: Remember to add the columns assigned to the foreign key matching both tables. For instance, in my example, I assumed a Store has a Product , meaning that the columns assigned to the foreign key would be something like store.id = product.store_id , so I had to add store_id to the list of selected columns;

Answer 4

This is very simple to implement this one

'store_product' =>  $item->products()->value('id', 'is_featured'),