如何从JSON解除0和false两者作为bool [英] How to unmarshall both 0 and false as bool from JSON

问题描述

目前，我正在映射一个服务的输出，可以说，它的布尔类型自由地交换0和假（以及1和真）。有没有办法使用内置的encoding / json unmarshal函数更宽松的解析器？我试过向json标签添加字符串，无济于事。

Currently am mapping the output of a service that, lets say, liberally interchanges 0 and false (and 1 and true) for its boolean types. Is there a way to use a more permissive parser for the built in encoding/json unmarshal function? I've tried adding ,string to the json tags to no avail.

一个我想要的例子：

An example of what I'd want:

type MyType struct {
    AsBoolean bool `json:"field1"`
    AlsoBoolean bool `json:"field2"`
}

然后，给定输入json：

then, given input json:

{
    "field1" : true,
    "field2" : 1
}

be：

the resulting struct would be:

obj := MyType{}
json_err := json.Unmarshal([]byte(input_json), &obj)
fmt.Printf("%v\n", obj.AsBoolean) //"true"
fmt.Printf("%v\n", obj.AlsoBoolean) //"true"

推荐答案

类型，以及我在哪里使用正常的布尔，换成这个：

Ended up using a special "boolean" type, and where I was using a normal bool, swapped for this:

type ConvertibleBoolean bool

func (bit ConvertibleBoolean) UnmarshalJSON(data []byte) error {
    asString := string(data)
    if asString == "1" || asString == "true" {
        bit = true
    } else if asString == "0" || asString == "false" {
        bit = false
    } else {
        return errors.New(fmt.Sprintf("Boolean unmarshal error: invalid input %s", asString))
    }
    return nil
}

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