85 lines
2.7 KiB
Go
85 lines
2.7 KiB
Go
package repository
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import (
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"context"
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"fashionapi/internal/model"
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"gorm.io/gorm"
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"gorm.io/gorm/clause"
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)
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// FavoriteRepository 收藏数据访问接口。
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type FavoriteRepository interface {
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// ListPaged 分页取某用户收藏，按收藏时间倒序。
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ListPaged(ctx context.Context, userID uint32, page, perPage int) ([]model.Favorite, error)
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// CountByUser 取某用户收藏总数（分页用）。
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CountByUser(ctx context.Context, userID uint32) (int64, error)
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// Add 新增收藏；同用户同 target 已存在时幂等忽略（ON DUPLICATE KEY DO NOTHING）。
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Add(ctx context.Context, f *model.Favorite) error
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// Remove 删除某用户对某个 target 的收藏。
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Remove(ctx context.Context, userID uint32, targetUID string) error
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// FilterExisting 返回在给定 ids 中、且属于该用户已收藏的 target_uid 子集（列表页打勾用）。
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FilterExisting(ctx context.Context, userID uint32, ids []string) ([]string, error)
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}
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type favoriteRepository struct {
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db *gorm.DB
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}
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// NewFavoriteRepository 创建收藏仓储。
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func NewFavoriteRepository(db *gorm.DB) FavoriteRepository {
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return &favoriteRepository{db: db}
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}
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func (r *favoriteRepository) ListPaged(ctx context.Context, userID uint32, page, perPage int) ([]model.Favorite, error) {
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var rows []model.Favorite
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offset := (page - 1) * perPage
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if offset < 0 {
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offset = 0
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}
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err := r.db.WithContext(ctx).
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Where("user_id = ?", userID).
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Order("created_at DESC").
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Offset(offset).
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Limit(perPage).
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Find(&rows).Error
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return rows, err
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}
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func (r *favoriteRepository) CountByUser(ctx context.Context, userID uint32) (int64, error) {
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var n int64
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err := r.db.WithContext(ctx).
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Model(&model.Favorite{}).
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Where("user_id = ?", userID).
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Count(&n).Error
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return n, err
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}
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func (r *favoriteRepository) Add(ctx context.Context, f *model.Favorite) error {
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// 复合唯一索引 (user_id, target_uid) 保证不重复；冲突时忽略而非报错，使接口天然幂等。
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return r.db.WithContext(ctx).
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Clauses(clause.OnConflict{
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Columns: []clause.Column{{Name: "user_id"}, {Name: "target_uid"}},
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DoNothing: true,
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}).Create(f).Error
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}
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func (r *favoriteRepository) Remove(ctx context.Context, userID uint32, targetUID string) error {
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return r.db.WithContext(ctx).
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Where("user_id = ? AND target_uid = ?", userID, targetUID).
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Delete(&model.Favorite{}).Error
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}
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func (r *favoriteRepository) FilterExisting(ctx context.Context, userID uint32, ids []string) ([]string, error) {
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if len(ids) == 0 {
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return []string{}, nil
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}
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var uids []string
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err := r.db.WithContext(ctx).
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Model(&model.Favorite{}).
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Where("user_id = ? AND target_uid IN ?", userID, ids).
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Pluck("target_uid", &uids).Error
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return uids, err
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}
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