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
}
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()
}
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