精简后的项目：仅保留 api/ui 源码、文档、构建依赖

api/dataloader/userFavoriteLoader.go

@@ -0,0 +1,60 @@
+package dataloader
+
+import (
+	"time"
+
+	"github.com/photoview/photoview/api/graphql/models"
+	"gorm.io/gorm"
+)
+
+func NewUserFavoriteLoader(db *gorm.DB) *UserFavoritesLoader {
+	return &UserFavoritesLoader{
+		maxBatch: 100,
+		wait:     5 * time.Millisecond,
+		fetch: func(keys []*models.UserMediaData) ([]bool, []error) {
+
+			userIDMap := make(map[int]struct{}, len(keys))
+			mediaIDMap := make(map[int]struct{}, len(keys))
+			for _, key := range keys {
+				userIDMap[key.UserID] = struct{}{}
+				mediaIDMap[key.MediaID] = struct{}{}
+			}
+			
+
+			uniqueUserIDs := make([]int, len(userIDMap))
+			uniqueMediaIDs := make([]int, len(mediaIDMap))
+
+			count := 0
+			for id := range userIDMap {
+				uniqueUserIDs[count] = id
+				count++
+			}
+
+			count = 0
+			for id := range mediaIDMap {
+				uniqueMediaIDs[count] = id
+				count++
+			}
+
+			var userMediaFavorites []*models.UserMediaData
+			err := db.Where("user_id IN (?)", uniqueUserIDs).Where("media_id IN (?)", uniqueMediaIDs).Where("favorite = TRUE").Find(&userMediaFavorites).Error
+			if err != nil {
+				return nil, []error{err}
+			}
+
+			result := make([]bool, len(keys))
+			for i, key := range keys {
+				favorite := false
+				for _, fav := range userMediaFavorites {
+					if fav.UserID == key.UserID && fav.MediaID == key.MediaID {
+						favorite = true
+						break
+					}
+				}
+				result[i] = favorite
+			}
+
+			return result, nil
+		},
+	}
+}