120 lines
3.9 KiB
Go
120 lines
3.9 KiB
Go
package feed
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import (
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"context"
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"feedsystem_video_go/internal/social"
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"feedsystem_video_go/internal/video"
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"time"
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"gorm.io/gorm"
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)
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type FeedRepository struct {
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db *gorm.DB
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}
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func NewFeedRepository(db *gorm.DB) *FeedRepository {
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return &FeedRepository{db: db}
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}
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// 查询最新视频. limit: 查询数量 latestBefore: 查询早于此时间的视频(零值则不限制)
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func (repo *FeedRepository) ListLatest(ctx context.Context, limit int, latestBefore time.Time) ([]*video.Video, error) {
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var videos []*video.Video
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query := repo.db.WithContext(ctx).Model(&video.Video{}).
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Order("create_time DESC")
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if !latestBefore.IsZero() {
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query = query.Where("create_time < ?", latestBefore)
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}
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if err := query.Limit(limit).Find(&videos).Error; err != nil {
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return nil, err
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}
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return videos, nil
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}
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// 查询点赞数最多的视频. limit: 查询数量 cursor: 游标
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func (repo *FeedRepository) ListLikesCountWithCursor(ctx context.Context, limit int, cursor *LikesCountCursor) ([]*video.Video, error) {
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var videos []*video.Video
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query := repo.db.WithContext(ctx).Model(&video.Video{}).
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Order("likes_count DESC, id DESC")
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if cursor != nil {
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query = query.Where(
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"(likes_count < ?) OR (likes_count = ? AND id < ?)",
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cursor.LikesCount,
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cursor.LikesCount, cursor.ID,
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)
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}
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if err := query.Limit(limit).Find(&videos).Error; err != nil {
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return nil, err
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}
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return videos, nil
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}
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// 查询关注用户的视频. limit: 查询数量 viewerAccountID: 查看者账户ID latestBefore: 查询早于此时间的视频(零值则不限制)
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func (repo *FeedRepository) ListByFollowing(ctx context.Context, limit int, viewerAccountID uint, latestBefore time.Time) ([]*video.Video, error) {
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var videos []*video.Video
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query := repo.db.WithContext(ctx).Model(&video.Video{}).
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Order("create_time DESC")
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if viewerAccountID > 0 {
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followingSubQuery := repo.db.WithContext(ctx).
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Model(&social.Social{}).
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Select("vlogger_id").
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Where("follower_id = ?", viewerAccountID)
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query = query.Where("author_id IN (?)", followingSubQuery)
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}
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if !latestBefore.IsZero() {
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query = query.Where("create_time < ?", latestBefore)
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}
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if err := query.Limit(limit).Find(&videos).Error; err != nil {
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return nil, err
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}
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return videos, nil
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}
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// 查询热门视频. limit: 查询数量 popularityBefore: 查询热度低于此值的视频 timeBefore: 查询早于此时间的视频 idBefore: 查询ID小于此值的视频
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func (repo *FeedRepository) ListByPopularity(ctx context.Context, limit int, popularityBefore int64, timeBefore time.Time, idBefore uint) ([]*video.Video, error) {
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var videos []*video.Video
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query := repo.db.WithContext(ctx).Model(&video.Video{}).
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Order("popularity DESC, create_time DESC, id DESC")
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// 只有当游标完整提供时才加过滤（popularity 允许为 0）
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if !timeBefore.IsZero() && idBefore > 0 {
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query = query.Where(
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"(popularity < ?) OR (popularity = ? AND create_time < ?) OR (popularity = ? AND create_time = ? AND id < ?)",
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popularityBefore,
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popularityBefore, timeBefore,
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popularityBefore, timeBefore, idBefore,
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)
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}
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if err := query.Limit(limit).Find(&videos).Error; err != nil {
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return nil, err
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}
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return videos, nil
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}
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func (repo *FeedRepository) GetByIDs(ctx context.Context, ids []uint) ([]*video.Video, error) {
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var videos []*video.Video
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if len(ids) == 0 {
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return videos, nil
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}
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if err := repo.db.WithContext(ctx).Model(&video.Video{}).
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Where("id IN ?", ids).Find(&videos).Error; err != nil {
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return nil, err
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}
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return videos, nil
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}
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func (repo *FeedRepository) ListByTag(ctx context.Context, tagName string, limit int) ([]*video.Video, error) {
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var videos []*video.Video
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err := repo.db.WithContext(ctx).Model(&video.Video{}).Table("videos").
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Joins("JOIN video_tags ON video_tags.video_id = videos.id").
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Joins("JOIN tags ON tags.id = video_tags.tag_id").
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Where("tags.name = ?", tagName).
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Order("videos.create_time desc").
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Limit(limit).
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Find(&videos).Error
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return videos, err
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}
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