feat: add sorting for tables

backend/internal/utils/paging_util.go

@@ -2,6 +2,7 @@ package utils
 
 import (
 	"gorm.io/gorm"
+	"reflect"
 )
 
 type PaginationResponse struct {
@@ -11,7 +12,36 @@ type PaginationResponse struct {
 	ItemsPerPage int   `json:"itemsPerPage"`
 }
 
-func Paginate(page int, pageSize int, db *gorm.DB, result interface{}) (PaginationResponse, error) {
+type SortedPaginationRequest struct {
+	Pagination struct {
+		Page  int `form:"pagination[page]"`
+		Limit int `form:"pagination[limit]"`
+	} `form:"pagination"`
+	Sort struct {
+		Column    string `form:"sort[column]"`
+		Direction string `form:"sort[direction]"`
+	} `form:"sort"`
+}
+
+func PaginateAndSort(sortedPaginationRequest SortedPaginationRequest, query *gorm.DB, result interface{}) (PaginationResponse, error) {
+	pagination := sortedPaginationRequest.Pagination
+	sort := sortedPaginationRequest.Sort
+
+	capitalizedSortColumn := CapitalizeFirstLetter(sort.Column)
+
+	sortField, sortFieldFound := reflect.TypeOf(result).Elem().Elem().FieldByName(capitalizedSortColumn)
+	isSortable := sortField.Tag.Get("sortable") == "true"
+	isValidSortOrder := sort.Direction == "asc" || sort.Direction == "desc"
+
+	if sortFieldFound && isSortable && isValidSortOrder {
+		query = query.Order(CamelCaseToSnakeCase(sort.Column) + " " + sort.Direction)
+	}
+
+	return Paginate(pagination.Page, pagination.Limit, query, result)
+
+}
+
+func Paginate(page int, pageSize int, query *gorm.DB, result interface{}) (PaginationResponse, error) {
 	if page < 1 {
 		page = 1
 	}
@@ -25,11 +55,11 @@ func Paginate(page int, pageSize int, db *gorm.DB, result interface{}) (Paginati
 	offset := (page - 1) * pageSize
 
 	var totalItems int64
-	if err := db.Count(&totalItems).Error; err != nil {
+	if err := query.Count(&totalItems).Error; err != nil {
 		return PaginationResponse{}, err
 	}
 
-	if err := db.Offset(offset).Limit(pageSize).Find(result).Error; err != nil {
+	if err := query.Offset(offset).Limit(pageSize).Find(result).Error; err != nil {
 		return PaginationResponse{}, err
 	}