Fix parse forms explode object with optional args (#456)

Author: vagruchi

bindparam_test.go

@@ -447,6 +447,14 @@ func TestBindParamsToExplodedObject(t *testing.T) {
 	err = bindParamsToExplodedObject("date", values, &nTDstDate)
 	assert.EqualValues(t, expectedDate, nTDstDate)
 
+	type ObjectWithOptional struct {
+		Time *time.Time `json:"time,omitempty"`
+	}
+
+	var optDstTime ObjectWithOptional
+	err = bindParamsToExplodedObject("explodedObject", values, &optDstTime)
+	assert.NoError(t, err)
+	assert.EqualValues(t, &now, optDstTime.Time)
 }
 
 func TestBindStyledParameterWithLocation(t *testing.T) {

bindstring.go

@@ -41,6 +41,16 @@ func BindStringToObject(src string, dst interface{}) error {
 		t = v.Type()
 	}
 
+	// For some optioinal args
+	if t.Kind() == reflect.Ptr {
+		if v.IsNil() {
+			v.Set(reflect.New(t.Elem()))
+		}
+
+		v = reflect.Indirect(v)
+		t = v.Type()
+	}
+
 	// The resulting type must be settable. reflect will catch issues like
 	// passing the destination by value.
 	if !v.CanSet() {