duanjiaolia97750 2012-12-29 03:49
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在Go中将组合对象转换为json

I am new to Go and am unsure about how to approach this problem. In OOP terms, I have a base class of Animal and two subclasses of Cat and Dog. I want to specify a ToJson method for Animal which will work for all animals.

My problem is that when I call dog.ToJson() I only get the Dog properties of dog and none of the Animal properties.

How can I make ToJson work as expected (ie with recursion)?

edit: Changed code to reflect suggestions in answer by lbonn, which I could not get to work how I want it to. edit2: consistency in question following code change

package main

import (
    "encoding/json"
    "fmt"
)

type Animal struct {
    Name string
}

type Cat struct {
    CatProperty int64
    Animal
}

type Dog struct {
    DogProperty int64
    Animal
}

func ToJson(i interface{}) []byte {
        data,err := json.Marshal(i)
    if err != nil {
        panic("???")
    }
    return data
}

func main() {
    dog := Dog{}
    dog.Name = "rex"
    dog.DogProperty = 2
    fmt.Println(string(ToJson(dog)))
    // Prints {"DogProperty":2}
    // I want it to print {"Name":"rex","DogProperty":2}
}
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