Question

我正在研究Laravel项目，我想为Android应用程序创建REST Api。在我的系统中，我有两个表：类别和图像。表格图像的列category_id是外键，它引用类别表上的列id。

类别表 //用户表迁移

 class CreateCategoriessTable extends Migration
    {
        public function up()
        {
         Schema::create('categories', function (Blueprint $table) {
         $table->increments('id');
         $table->string('name');
         $table->timestamps();
        });
       }
...
    }

图像表

class CreateImagesTable extends Migration
{
    public function up()
    {
        Schema::create('images', function(Blueprint $table){
            $table->increments('id');
            $table->string('name')
            $table->integer('category_id')->unsigned();
            $table->foreign('category_id')
                ->references('id')
                ->on('categories')
                ->onDelete('cascade');
            $table->timestamps();
        });
    }
    ...
}

我的图片模型：

class Images extends Model
{
    protected $fillable = ['name'];

    public function category(){
        $this->belongsTo('App\Category');
    }
}

我的类别模型：

class Categories extends Model
{
    protected $fillable = ['name'];

    public function images(){
        $this->hasMany('App\Images');
    }
}

因此，我使用API方法创建了一个CategoryController，并配置了访问相应功能的路由。通过GET的api / category / url重定向到我控制器的index函数，该函数是这样的：

public function index()
{
    $categories = Category::get();
    return CategoryResource::collection($categories);
}

这样，我可以获得类别表数据，但是我想合并用户表和图像表，并得到如下响应：

[
   {
      'id': 1,
      'name': 'category_name',
      'images': {'image_1','image_2','image_3',...}
   }
]

我该怎么做？假设“类别”中有很多图片！

编辑：：：

我创建的CategoryResource（）类为：

class CategoryResource extends JsonResource

    {
          public function toArray($request)
        {
         return parent::toArray($request);
        }
    }

并将类别控制器更改为：

public function index()
{
    $categories= Category::with('images')->get();
    return CategoryResource::collection($categories);
}

假设返回：（实际上，在我的情况下，它返回以下json）

 {
    "data": [{
        "id": 6,
        "name": "Category1",
        "created_at": "2018-07-31 16:18:51",
        "updated_at": "2018-08-03 14:53:26",
        "images": [{
            "id": 23,
            "category_id": 6,
            "name": "category_6_31.jpg",
            "created_at": "2018-07-31 16:18:51",
            "updated_at": "2018-07-31 16:18:51"
        }, {
            "id": 27,
            "category_id": 6,
            "name": "category_6_752.jpg",
            "created_at": "2018-08-02 01:35:52",
            "updated_at": "2018-08-02 01:35:52"
        }]
    }, {
        "id": 7,
        "name": "Category2",
        "created_at": "2018-07-31 16:19:50",
        "updated_at": "2018-07-31 16:19:50",
        "images": [{
            "id": 24,
            "category_id":7
            "name": "product_7_1533053990.jpg",
            "created_at": "2018-07-31 16:19:50",
            "updated_at": "2018-07-31 16:19:50"
        }]
    }]
}

但是我想将JSON输出修改为：（删除不必要的列（键值对））为：

{
    "data": [{
        "id": 6,
        "name": "Category1",
        "images": [{
            "id": 23,
            "category_id": 6,
            "name": "category_6_31.jpg",
        }, {
            "id": 27,
            "category_id": 6,
            "name": "category_6_752.jpg",
        }]
    }, {
        "id": 7,
        "name": "Category2",
        "images": [{
            "id": 24,
            "category_id":7
            "name": "product_7_1533053990.jpg",
        }]
    }]
}

如何编码CategoryResource类？ 因为我做不到：::

return [
     'id'=>$this->id,
     'name'=>$this->name
]

这将引发错误。...

Answer 1

尝试一下

public function index()
    {
        $categories = Category::with('images')->get();
        return response()->json($categories,200);
    }

从表中获取与Laravel中API具有一对多关系的数据

1 个答案: