如何在Rails JSON响应中返回数组而不是对象数组

Question

我有一个关联为 download has_many download_links

的模型

我正在downloadlink控制器中调用download_links。

  def download_links
    @downloads = Download.all
    render json: { data:@downloads.as_json(:only=>[:id],
    include: {
        :downloadlink => {:only =>:url}
      }
    ), message:"success"}, status: :ok
  end

邮递员的结果如下：

{
"data": [
    {
        "id": 1,
        "downloadlink": [
            {
                "url": "1920x1080.png"
            },
            {
                "url": "1366x766.png"
            },
            {
                "url": "1280x720.png"
            },
            {
                "url": "1024x768.png"
            }
        ]
    }
],
"message": "success"}

现在我希望结果是这样的：

{
"data": [
    {
        "id": 1,
        "downloadlink": [
            "1920x1080.png",
            "1366x766.png",
            "1280x720.png",
            "1024x768.png"
        ]
    }
],
"message": "success"}

Answer 1

考虑| ID | CREATED | ... | 1 | 2019-11-01 14:19:28.611000 | ... | 2 | 2019-11-01 14:19:28.680000 | ... | 3 | 2019-11-01 14:19:28.612000 | ... | 4 | 2019-11-01 14:19:28.613000 | ... | 5 | 2019-11-01 14:19:28.681000 | ... | 6 | 2019-11-01 14:19:28.681000 | ... 关系的一种方法是：

download has_many download_links

在 downlad.rb 模型中

def download_links
    @downloads = Download.includes(:download_links)
    render json: { 
       data:@downloads.map{ |d| d.download_json }, message:"success"
    }, status: :ok
  end

根据您的命名约定更正名称/关联。