1 package main
2
3 import(
4 "fmt"
5 "reflect"
6 )
7
8 func main(){
9 // iterate through the attributes of a Data Model instance
10 for name, mtype := range attributes(&Dish{}) {
11 fmt.Printf("Name: %s, Type %s\n", name, mtype.Name())
12 }
13 }
14
15 // Data Model
16 type Dish struct {
17 Id int
18 Name string
19 Origin string
20 Query func()
21 }
22
23 // Example of how to use Go's reflection
24 // Print the attributes of a Data Model
25 func attributes(m interface{}) (map[string]reflect.Type) {
26 typ := reflect.TypeOf(m)
27 // if a pointer to a struct is passed, get the type of the dereferenced object
28 if typ.Kind() == reflect.Ptr{
29 typ = typ.Elem()
30 }
31
32 // create an attribute data structure as a map of types keyed by a string.
33 attrs := make(map[string]reflect.Type)
34 // Only structs are supported so return an empty result if the passed object
35 // isn't a struct
36 if typ.Kind() != reflect.Struct {
37 fmt.Printf("%v type can't have attributes inspected\n", typ.Kind())
38 return attrs
39 }
40
41 // loop through the struct's fields and set the map
42 for i := 0; i < typ.NumField(); i++ {
43 p := typ.Field(i)
44 if !p.Anonymous {
45 attrs[p.Name] = p.Type
46 }
47 }
48
49 return attrs
50 }
