feat: Update project structure and configuration files

backend/app/requests/sort.go

@@ -0,0 +1,41 @@
+package requests
+
+import (
+	"strings"
+
+	"github.com/samber/lo"
+)
+
+type SortQueryFilter struct {
+	Asc  *string `json:"asc" form:"asc"`
+	Desc *string `json:"desc" form:"desc"`
+}
+
+func (s *SortQueryFilter) AscFields() []string {
+	if s.Asc == nil {
+		return nil
+	}
+	return strings.Split(*s.Asc, ",")
+}
+
+func (s *SortQueryFilter) DescFields() []string {
+	if s.Desc == nil {
+		return nil
+	}
+	return strings.Split(*s.Desc, ",")
+}
+
+func (s *SortQueryFilter) DescID() *SortQueryFilter {
+	if s.Desc == nil {
+		s.Desc = lo.ToPtr("id")
+	}
+
+	items := s.DescFields()
+	if lo.Contains(items, "id") {
+		return s
+	}
+
+	items = append(items, "id")
+	s.Desc = lo.ToPtr(strings.Join(items, ","))
+	return s
+}