tercul-backend/internal/repositories/collection_repository.go

package repositories

import (
	"context"
	"gorm.io/gorm"
	"tercul/internal/models"
)

// CollectionRepository defines CRUD methods specific to Collection.
type CollectionRepository interface {
	BaseRepository[models.Collection]
	ListByUserID(ctx context.Context, userID uint) ([]models.Collection, error)
	ListPublic(ctx context.Context) ([]models.Collection, error)
	ListByWorkID(ctx context.Context, workID uint) ([]models.Collection, error)
}

type collectionRepository struct {
	BaseRepository[models.Collection]
	db *gorm.DB
}

// NewCollectionRepository creates a new CollectionRepository.
func NewCollectionRepository(db *gorm.DB) CollectionRepository {
	return &collectionRepository{
		BaseRepository: NewBaseRepositoryImpl[models.Collection](db),
		db:             db,
	}
}

// ListByUserID finds collections by user ID
func (r *collectionRepository) ListByUserID(ctx context.Context, userID uint) ([]models.Collection, error) {
	var collections []models.Collection
	if err := r.db.WithContext(ctx).Where("user_id = ?", userID).Find(&collections).Error; err != nil {
		return nil, err
	}
	return collections, nil
}

// ListPublic finds public collections
func (r *collectionRepository) ListPublic(ctx context.Context) ([]models.Collection, error) {
	var collections []models.Collection
	if err := r.db.WithContext(ctx).Where("is_public = ?", true).Find(&collections).Error; err != nil {
		return nil, err
	}
	return collections, nil
}

// ListByWorkID finds collections by work ID
func (r *collectionRepository) ListByWorkID(ctx context.Context, workID uint) ([]models.Collection, error) {
	var collections []models.Collection
	if err := r.db.WithContext(ctx).Joins("JOIN collection_works ON collection_works.collection_id = collections.id").
		Where("collection_works.work_id = ?", workID).
		Find(&collections).Error; err != nil {
		return nil, err
	}
	return collections, nil
}