Golang如何在json.RawMessage中修改值

huangapple
go评论113阅读模式
英文:

Golang changing value in json.RawMessage

问题

我有一个json.RawMessage，为了获取它，我需要向API发送一个请求。我的问题是，我需要对这个消息进行更改，只需要更改一个字段，所以我的问题是最有效的方法是什么？

  1. json.RawMessage
  2. {
  3.         "make": "VW",
  4.         "model": "ARTEON",
  5.         "version": "2.0 TDI",
  6.         "year_min": 2017,
  7.         "power_ps": 200,
  8.         "fuel": "diesel",
  9.         "body_type": "sedan",
  10.         "currency": "EUR",
  11.         "co2_emission": 130
  12.     }

例如，我想将燃料类型从柴油更改为汽油。

  1. 期望的输出
  2. {
  3.         "make": "VW",
  4.         "model": "ARTEON",
  5.         "version": "2.0 TDI",
  6.         "year_min": 2017,
  7.         "power_ps": 200,
  8.         "fuel": "gasoline",
  9.         "body_type": "sedan",
  10.         "currency": "EUR",
  11.         "co2_emission": 130
  12.     }
英文:

I have json.RawMessage and for getting I need to send a request to API. My problem is that I need to make a change in that message I just need to change one field, so my question is what is the most effective way to do it

  1. json.RawMessage
  2. {
  3.         "make": "VW",
  4.         "model": "ARTEON",
  5.         "version": "2.0 TDI",
  6.         "year_min": 2017,
  7.         "power_ps": 200,
  8.         "fuel": "diesel",
  9.         "body_type": "sedan",
  10.         "currency": "EUR",
  11.         "co2_emission": 130
  12.     }

so for example I want to change fuel type from diesel to gasoline

  1. expected output
  2. {
  3.         "make": "VW",
  4.         "model": "ARTEON",
  5.         "version": "2.0 TDI",
  6.         "year_min": 2017,
  7.         "power_ps": 200,
  8.         "fuel": "gasoline",
  9.         "body_type": "sedan",
  10.         "currency": "EUR",
  11.         "co2_emission": 130
  12.     }

答案1

得分: 0

除了@mkopriva的评论（我认为这是更可取的方式），你可以尝试使用map而不是struct（如果struct对你不适用）。

  1. package main
  3. import (
  4. 	"encoding/json"
  5. 	"fmt"
  6. )
  8. var rm = json.RawMessage(`{
  9.         "make": "VW",
  10.         "model": "ARTEON",
  11.         "version": "2.0 TDI",
  12.         "year_min": 2017,
  13.         "power_ps": 200,
  14.         "fuel": "diesel",
  15.         "body_type": "sedan",
  16.         "currency": "EUR",
  17.         "co2_emission": 130
  18.     }`)
  20. func main() {
  21. 	var objmap map[string]interface{}
  22. 	
  23. 	err := json.Unmarshal(rm, &objmap)
  24. 	if err != nil {
  25. 		panic(err)
  26. 	}
  27. 	
  28. 	objmap["fuel"] = "gasoline"
  29. 	
  30. 	result, err := json.Marshal(objmap)
  31. 	if err != nil {
  32. 		panic(err)
  33. 	}
  34. 	
  35. 	fmt.Println(string(result))
  36. }

https://go.dev/play/p/nue-SA-LGVf

英文:

In addition to the comment from @mkopriva(That I think is the more preferable way), you can try using a map instead of a struct(If a struct is not applicable to you).

  1. package main
  3. import (
  4. 	"encoding/json"
  5. 	"fmt"
  6. )
  8. var rm = json.RawMessage(`{
  9.         "make": "VW",
  10.         "model": "ARTEON",
  11.         "version": "2.0 TDI",
  12.         "year_min": 2017,
  13.         "power_ps": 200,
  14.         "fuel": "diesel",
  15.         "body_type": "sedan",
  16.         "currency": "EUR",
  17.         "co2_emission": 130
  18.     }`)
  20. func main() {
  21. 	var objmap map[string]interface{}
  22. 	
  23. 	err := json.Unmarshal(rm, &objmap)
  24. 	if err != nil {
  25. 		panic(err)
  26. 	}
  27. 	
  28. 	objmap["fuel"] = "gasoline"
  29. 	
  30. 	result, err := json.Marshal(objmap)
  31. 	if err != nil {
  32. 		panic(err)
  33. 	}
  34. 	
  35. 	fmt.Println(string(result))
  36. }

https://go.dev/play/p/nue-SA-LGVf

huangapple
  • 本文由 发表于 2022年1月27日 21:51:36
  • 转载请务必保留本文链接：https://go.coder-hub.com/70879713.html
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