如何解析嵌套JSON对象中的内部字段 [英] How to parse an inner field in a nested JSON object

问题描述

我有一个与此对象相似的JSON对象:

{
  "name": "Cain",
  "parents": {
    "mother" : "Eve",
    "father" : "Adam"
  }
}

现在，我想将"name"和"mother"解析为该结构:

struct {
  Name String
  Mother String `json:"???"`
}

我想用json:... struct标签指定JSON字段名称，但是我不知道该用什么作为标签，因为它不是我感兴趣的顶级对象. encoding/json 包文档或流行博客文章JSON和Go .我还测试了mother，parents/mother和parents.mother.

解决方案

不幸的是，与encoding/xml不同，json包没有提供访问嵌套值的方法.您将要创建一个单独的Parents结构，或者将类型分配为map[string]string.例如:

type Person struct {
    Name string
    Parents map[string]string
}

您可以这样为母亲提供吸气剂:

func (p *Person) Mother() string {
    return p.Parents["mother"]
}

这可能会或可能不会影响当前的代码库，并且如果菜单上未包含将Mother字段重构为方法调用的内容，那么您可能希望创建一个单独的方法来解码并符合当前的结构. /p>

I have a JSON object similar to this one:

{
  "name": "Cain",
  "parents": {
    "mother" : "Eve",
    "father" : "Adam"
  }
}

Now I want to parse "name" and "mother" into this struct:

struct {
  Name String
  Mother String `json:"???"`
}

I want to specify the JSON field name with the json:... struct tag, however I don't know what to use as tag, because it is not the top object I am interested in. I found nothing about this in the encoding/json package docs nor in the popular blog post JSON and Go. I also tested mother, parents/mother and parents.mother.

解决方案

Unfortunately, unlike encoding/xml, the json package doesn't provide a way to access nested values. You'll want to either create a separate Parents struct or assign the type to be map[string]string. For example:

type Person struct {
    Name string
    Parents map[string]string
}

You could then provide a getter for mother as so:

func (p *Person) Mother() string {
    return p.Parents["mother"]
}

This may or may not play into your current codebase and if refactoring the Mother field to a method call is not on the menu, then you may want to create a separate method for decoding and conforming to your current struct.

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