Check if struct is empty if struct contains json.RawMessage

equality, go, struct

Solution

The reason is that `json.RawMessage` is a Alias for a `[]byte` and maps, slices etc can not be compared normally.

You can compare slices with `reflect.DeepEqual` method.

See example below.

package main

import "encoding/json"
import "reflect"

type myStruct struct 
{
        a string `json:"a"`
        b json.RawMessage `json:"b"`
        c json.RawMessage `json:"c"`
}   

func (m myStruct ) IsEmpty() bool {
    return reflect.DeepEqual(myStruct{}, m)
}


func main() {
    var mystuff myStruct = myStruct{}

    mystuff.IsEmpty()
}

GOLANG Playground

Reference for comparing slices: How to compare struct, slice, map are equal?

See the `RawMessage` type. json.RawMessage type: https://golang.org/src/encoding/json/stream.go?s=6218:6240#L237

Problem

I'm trying to create a method extension to check if my struct was initialized but I'm getting this error: invalid operation: myStruct literal == inStruct (struct containing json.RawMessage cannot be compared) Here's my code: ``` package datamodels import "encoding/json" type myStruct struct { a string json:"a" b json.RawMessage json:"b" c json.RawMessage json:"c" } func (m *myStruct ) IsEmpty() bool { return (myStruct {}) == m } ```

Original source

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