duanmei1694 2019-07-16 12:54
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进行结构比较-reflect.DeepEqual在地图上失败吗?

I'm writing unit test and my goal is to unmarshall data from json to one struct and compare it to the other, mock struct. I'm using reflect.DeepEqual() method but it's returning false on these.

My guess is that it is somehow related to type casting going on in the background, where map[string]interface{} is converted to map[string]int, but that's as far as I got.

type MyStruct struct {
    Cache map[string]interface{} `json:"cache"`
}

var js = `{"cache":{"productsCount":28}}`

func main() {
    var s1, s2 MyStruct
    s1 = MyStruct{
        Cache: map[string]interface{} {
            "productsCount": 28,
        },
    }
    s2 = MyStruct{}
    err := json.Unmarshal([]byte(js), &s2)
    if err != nil {
        fmt.Println(err)
        os.Exit(1)
    }

    fmt.Printf("%#v
", s1)
    fmt.Printf("%#v
", s2)
    fmt.Println(reflect.DeepEqual(s1, s2))
}

The output looks like this:

main.MyStruct{Cache:map[string]interface {}{"productsCount":28}}
main.MyStruct{Cache:map[string]interface {}{"productsCount":28}}
false
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1条回答 默认 最新

  • douqiaolong0528 2019-07-16 13:21
    关注

    The thing here is how the golang encoding an int, you're initializing it as int, but in the json you provide it is float64.

    Here is working example:

    package main
    
    import (
        "encoding/json"
        "fmt"
        "os"
        "reflect"
    )
    
    type MyStruct struct {
        Cache map[string]interface{} `json:"cache"`
    }
    
    var js = `{"cache":{"productsCount":28}}`
    
    func main() {
        var s1, s2 MyStruct
        s1 = MyStruct{
            Cache: map[string]interface{}{
                "productsCount": float64(28),
            },
        }
        s2 = MyStruct{}
        err := json.Unmarshal([]byte(js), &s2)
        if err != nil {
            fmt.Println(err)
            os.Exit(1)
        }
    
        fmt.Printf("%#v
    ", s1)
        fmt.Printf("%#v
    ", s2)
        fmt.Println(reflect.DeepEqual(s1, s2))
    }
    

    Output:

    main.MyStruct{Cache:map[string]interface {}{"productsCount":28}}
    main.MyStruct{Cache:map[string]interface {}{"productsCount":28}}
    true
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

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