Trying to use a Struct with a variable named "type" for JSON

[pop...@gmail.com]

Below is a snippet of my code. I need to pass a json body that has a field name "type" in it. I can create the body as a string, but I was trying to leverage structs. Obviously, trying to create a variable named 'type' in the struct throws errors. As "type" as a field name is common in json, I was wondering how others have solved for this situation. I have been googling for possible solutions, but finding the right mix of search terms has proven challenging.

package main

import (

"fmt"

"encoding/json"

"gopkg.in/resty.v0"

)

type LoginRequest struct {

username string

password string

}

func createsession() {

_, err := resty.R().

SetHeader("Content-Type", "application/json").

SetBody(`{"type": "APISession","version": {"type": "APIVersion","major": 1,"minor": 6,"micro": 0}}`).

Post("http://192.168.2.249/session")

if err != nil {

panic(err)

}

}

func login() {

_, err := resty.R().

SetHeader("Content-Type", "application/json").

SetBody(LoginRequest{username: "my_admin", password: "testing123"}).

//SetBody(`{"type": "LoginRequest","username": "my_admin","password": "testing123"}` //this works

Post("http://192.168.2.249/login")

}

func main ()

    createsession()

    login()

[Tamás Gulácsi]

TL;DR; use struct tags to specify marshal/unmarsal names.

type LoginRequest struct {

User string `json:"username"`

Passw string `json:"password"`

}

...

SetBody(struct {
  Type string `json:"type"`
  LoginRequest
}{
  Type: "LoginRequest", LoginRequest:{User:"my_admin", Passw:"testing123"}})

[Matt Harden]

Note that you can't use lowercase struct field names with encoding/json anyway, because fields must be exported for encoding/json to see them, and fields are exported by starting them with an uppercase letter. So if you want the JSON field names to be lower case, you have to use struct tags. I think that while Tamás's solution should work, you probably just want the type field to be in LoginRequest itself:

type LoginRequest struct {

Type string `json:"type"`

User     string `json:"username"`

Password string `json:"password"`

}

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[Adam Bowen]

Sweet. Thanks gents. Still fairly new to Golang.

I followed Matt's example and was able to get it working. 

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