Utility to merge maps

utils/map.go

@@ -183,3 +183,18 @@ func MapKeysReplace(m map[string]struct{}, old, new string) map[string]struct{}
 	return m
 }
 */
+
+// Used to merge multiple maps (eg: output of struct having ExtraFields)
+func MergeMapsStringIface(mps ...map[string]interface{}) (outMp map[string]interface{}) {
+	outMp = make(map[string]interface{})
+	for i, mp := range mps {
+		if i == 0 {
+			outMp = mp
+			continue
+		}
+		for k, v := range mp {
+			outMp[k] = v
+		}
+	}
+	return
+}

utils/map_test.go

@@ -1,6 +1,9 @@
 package utils
 
-import "testing"
+import (
+	"reflect"
+	"testing"
+)
 
 func TestStringMapParse(t *testing.T) {
 	sm := ParseStringMap("1;2;3;4")
@@ -31,3 +34,24 @@ func TestStringMapCompare(t *testing.T) {
 		t.Error("Error detecting missing: ", sm)
 	}
 }
+
+func TestMapMergeMapsStringIface(t *testing.T) {
+	mp1 := map[string]interface{}{
+		"Hdr1": "Val1",
+		"Hdr2": "Val2",
+		"Hdr3": "Val3",
+	}
+	mp2 := map[string]interface{}{
+		"Hdr3": "Val4",
+		"Hdr4": "Val4",
+	}
+	eMergedMap := map[string]interface{}{
+		"Hdr1": "Val1",
+		"Hdr2": "Val2",
+		"Hdr3": "Val4",
+		"Hdr4": "Val4",
+	}
+	if mergedMap := MergeMapsStringIface(mp1, mp2); !reflect.DeepEqual(eMergedMap, mergedMap) {
+		t.Errorf("Expecting: %+v, received: %+v", eMergedMap, mergedMap)
+	}
+}