Merge pull request #10 from HotelUrbano/feature/fill-structs

Feature/fill structs

Gopkg.toml

@@ -37,6 +37,10 @@
   name = "gopkg.in/h2non/gock.v1"
   version = "1.0.8"
 
+[[constraint]]
+  branch = "master"
+  name = "github.com/fatih/structs"
+
 [prune]
   go-tests = true
   unused-packages = true

lib/main.go

@@ -15,6 +15,8 @@ import (
 	"strconv"
 	"strings"
 	"time"
+
+	"github.com/fatih/structs"
 )
 
 const (
@@ -451,3 +453,15 @@ func Truncate(s string, i int) (r string) {
 	r = strings.Replace(r, "    ", "", -1)
 	return
 }
+
+// Fill merges data from struct instance to another
+// By @titpetric suggested in https://scene-si.org/2016/06/01/golang-tips-and-tricks
+func Fill(dest interface{}, src interface{}) {
+	mSrc := structs.Map(src)
+	mDest := structs.Map(dest)
+	for key, val := range mSrc {
+		if _, ok := mDest[key]; ok {
+			structs.New(dest).Field(key).Set(val)
+		}
+	}
+}

lib/main_test.go

@@ -642,3 +642,22 @@ func TestTruncate(t *testing.T) {
     }`
 	assert.Equal(t, expected, Truncate(json1, len(json1)))
 }
+
+func TestFill(t *testing.T) {
+	a := struct {
+		ID      int
+		Name    string
+		IsAdmin bool
+	}{}
+
+	b := struct {
+		Name string
+	}{}
+
+	b.Name = "Bobby"
+
+	Fill(&a, b)
+
+	assert.Equal(t, "Bobby", a.Name)
+}
+