fix allow zero option problem in get func

retrieve.go

@@ -9,7 +9,7 @@ import (
 func Get(out interface{}, path string, opts ...option) interface{} {
 	options := newOptions(opts...)
 
-	result := get(reflect.ValueOf(out), path)
+	result := get(reflect.ValueOf(out), path, opts...)
 	// valid kind and we can return a result.Interface() without panic
 	if result.Kind() != reflect.Invalid && result.CanInterface() {
 		// if we don't allow zero and the result is a zero value return nil
@@ -38,7 +38,9 @@ func GetOrElse(v interface{}, def interface{}) interface{} {
 	return val.Elem().Interface()
 }
 
-func get(value reflect.Value, path string) reflect.Value {
+func get(value reflect.Value, path string, opts ...option) reflect.Value {
+	options := newOptions(opts...)
+
 	if value.Kind() == reflect.Slice || value.Kind() == reflect.Array {
 		var resultSlice reflect.Value
 
@@ -57,7 +59,7 @@ func get(value reflect.Value, path string) reflect.Value {
 
 			resultValue := get(item, path)
 
-			if resultValue.Kind() == reflect.Invalid || resultValue.IsZero() {
+			if resultValue.Kind() == reflect.Invalid || (resultValue.IsZero() && !options.allowZero) {
 				continue
 			}
 

retrieve_test.go

@@ -67,6 +67,21 @@ func TestGetThroughInterface(t *testing.T) {
 	is.Equal(Get(foo, "BarPointer.Bars.Bar.Name"), []string{"Level2-1", "Level2-2"})
 }
 
+func TestGetWithAllowZero(t *testing.T) {
+	is := assert.New(t)
+
+	var test []struct {
+		Age int
+	}
+
+	for i := 0; i < 10; i++ {
+		test = append(test, struct{ Age int }{Age: i})
+	}
+
+	is.Equal(Get(test, "Age").([]int), []int{1, 2, 3, 4, 5, 6, 7, 8, 9})
+	is.Equal(Get(test, "Age", WithAllowZero()).([]int), []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9})
+}
+
 func TestGetNotFound(t *testing.T) {
 	is := assert.New(t)