go - json 编码结构数组的一个属性

Question

所以我有一个 struct Recipe 数组，它包含一些属性，其中一个属性是 struct Source，我想将整个数组转换为 json 但只有 Recipe 结构的 Source 属性

代码:https://play.golang.org/p/E71d4xzNM4

结果:

[
{
    "Id": 1,
    "Title": "Fine Peanutbutter",
    "Description": "The best peanutbutter in the world",
    "Source": {
        "Name": "Peter",
        "Address": "32121 Little Midge"
    },
    "Price": 49
},
{
    "Id": 2,
    "Title": "Fine Jelly",
    "Description": "The best Jelly in the world",
    "Source": {
        "Name": "Peter",
        "Address": "32121 Little Midge"
    },
    "Price": 39
}
]

想要的结果:

[
{
    "Name": "Peter",
    "Address": "32121 Little Midge"     
},
{
    "Name": "Peter",
    "Address": "32121 Little Midge"
}
]

我如何在不遍历整个数组并创建一个新的数组结构并在该结构上执行 json 编码的情况下获得它

Answer 1

您可以定义自定义编码器:

func (r Recipe) MarshalJSON() ([]byte, error) {
  return json.Marshal(r.Source)
}

https://play.golang.org/p/xLUAlMllGR