doukun1450
2013-09-24 17:30
浏览 115

Golang从结构数组中选择字段

I get an array of all the users with an attribute ID in their document:

Users := []backend.User{}

err := Collection.Find(bson.M{"channel_id": bson.ObjectIdHex(chId)}).All(&Users)
if err != nil {
  println(err)
}

Which I want to send as a JSON response back to the browser/client. However, the User struct contains things like IDs and Hahsed Passwords which i don't want to send back!

I was looking at something like using the reflect package to select the fields of the struct and then putting them into a map[string]interface{} but im not sure how to do it with an array of users.

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1条回答 默认 最新

  • dsb12300 2013-09-24 18:26
    最佳回答

    You can ignore struct fields while json.Marshal.

    package main
    
    import (
        "encoding/json"
        "fmt"
    )
    
    type User struct {
        Id   int    `json:"-"`
        Name string `json:"name"`
    }
    
    type Users []*User
    
    func main() {
    
        user := &Users{
            &User{1, "Max"},
            &User{2, "Alice"},
            &User{3, "Dan"},
        }
    
        json, _ := json.Marshal(user)
    
        fmt.Println(string(json))
    }
    

    Runnable example in Play Golang: http://play.golang.org/p/AEC_TyXE3B

    There is a very useful part about using the tags in the doc. Same for XML, but it's more complicated for obvious reasons.

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