Fix variable typo

orm/class.go

@@ -90,10 +90,10 @@ func (c *Class) Read(args map[string]string, r *http.Request) (interface{}, erro
 
 func (c *Class) ReadAll(args map[string]string, r *http.Request) (interface{}, error) {
 	var classes []*Class
-	if err := DB().Preload("Coordinator").Preload("Minuter").Order("name").Find(&classs).Error; err != nil {
+	if err := DB().Preload("Coordinator").Preload("Minuter").Order("name").Find(&classes).Error; err != nil {
 		return nil, err
 	}
-	for _, class := range classs {
+	for _, class := range classes {
 		class.GetTeachers()
 	}