Add Replace support for has many associations

association.go

@@ -126,7 +126,8 @@ func (association *Association) Replace(values ...interface{}) *Association {
 	if relationship.Kind == "many_to_many" {
 		association.setErr(relationship.JoinTableHandler.Delete(relationship.JoinTableHandler, query, relationship))
 	} else if relationship.Kind == "has_one" || relationship.Kind == "has_many" {
-		query.Update(foreignKeyMap)
+		fieldValue := reflect.New(association.Field.Field.Type()).Interface()
+		association.setErr(query.Model(fieldValue).UpdateColumn(foreignKeyMap).Error)
 	}
 	return association
 }

association_test.go

@@ -175,11 +175,18 @@ func TestHasMany(t *testing.T) {
 	var comments3 []Comment
 	DB.Model(&post).Related(&comments3)
 	if !compareComments(comments3, []string{"Comment 3"}) {
-		fmt.Println(comments3)
 		t.Errorf("Delete an existing resource for has many relations")
 	}
 
 	// Replace
+	DB.Model(&post).Association("Comments").Replace(&Comment{Content: "Comment 4"}, &Comment{Content: "Comment 5"})
+
+	var comments4 []Comment
+	DB.Model(&post).Related(&comments4)
+	if !compareComments(comments4, []string{"Comment 4", "Comment 5"}) {
+		t.Errorf("Replace has many relations")
+	}
+
 	// Clear
 }