feat: add coupon support to orders and create user_coupons model

- Added CouponID field to Order model to track used coupons.
- Updated order query generation to include CouponID.
- Introduced UserCoupon model to manage user coupon associations.
- Implemented query methods for UserCoupon to facilitate CRUD operations.
- Updated query context and default query setup to include UserCoupon.

backend/database/models/query.gen.go

@@ -22,6 +22,7 @@ var (
 	ContentAccessQuery     *contentAccessQuery
 	ContentAssetQuery      *contentAssetQuery
 	ContentPriceQuery      *contentPriceQuery
+	CouponQuery            *couponQuery
 	MediaAssetQuery        *mediaAssetQuery
 	NotificationQuery      *notificationQuery
 	OrderQuery             *orderQuery
@@ -35,6 +36,7 @@ var (
 	UserQuery              *userQuery
 	UserCommentActionQuery *userCommentActionQuery
 	UserContentActionQuery *userContentActionQuery
+	UserCouponQuery        *userCouponQuery
 )
 
 func SetDefault(db *gorm.DB, opts ...gen.DOOption) {
@@ -44,6 +46,7 @@ func SetDefault(db *gorm.DB, opts ...gen.DOOption) {
 	ContentAccessQuery = &Q.ContentAccess
 	ContentAssetQuery = &Q.ContentAsset
 	ContentPriceQuery = &Q.ContentPrice
+	CouponQuery = &Q.Coupon
 	MediaAssetQuery = &Q.MediaAsset
 	NotificationQuery = &Q.Notification
 	OrderQuery = &Q.Order
@@ -57,6 +60,7 @@ func SetDefault(db *gorm.DB, opts ...gen.DOOption) {
 	UserQuery = &Q.User
 	UserCommentActionQuery = &Q.UserCommentAction
 	UserContentActionQuery = &Q.UserContentAction
+	UserCouponQuery = &Q.UserCoupon
 }
 
 func Use(db *gorm.DB, opts ...gen.DOOption) *Query {
@@ -67,6 +71,7 @@ func Use(db *gorm.DB, opts ...gen.DOOption) *Query {
 		ContentAccess:     newContentAccess(db, opts...),
 		ContentAsset:      newContentAsset(db, opts...),
 		ContentPrice:      newContentPrice(db, opts...),
+		Coupon:            newCoupon(db, opts...),
 		MediaAsset:        newMediaAsset(db, opts...),
 		Notification:      newNotification(db, opts...),
 		Order:             newOrder(db, opts...),
@@ -80,6 +85,7 @@ func Use(db *gorm.DB, opts ...gen.DOOption) *Query {
 		User:              newUser(db, opts...),
 		UserCommentAction: newUserCommentAction(db, opts...),
 		UserContentAction: newUserContentAction(db, opts...),
+		UserCoupon:        newUserCoupon(db, opts...),
 	}
 }
 
@@ -91,6 +97,7 @@ type Query struct {
 	ContentAccess     contentAccessQuery
 	ContentAsset      contentAssetQuery
 	ContentPrice      contentPriceQuery
+	Coupon            couponQuery
 	MediaAsset        mediaAssetQuery
 	Notification      notificationQuery
 	Order             orderQuery
@@ -104,6 +111,7 @@ type Query struct {
 	User              userQuery
 	UserCommentAction userCommentActionQuery
 	UserContentAction userContentActionQuery
+	UserCoupon        userCouponQuery
 }
 
 func (q *Query) Available() bool { return q.db != nil }
@@ -116,6 +124,7 @@ func (q *Query) clone(db *gorm.DB) *Query {
 		ContentAccess:     q.ContentAccess.clone(db),
 		ContentAsset:      q.ContentAsset.clone(db),
 		ContentPrice:      q.ContentPrice.clone(db),
+		Coupon:            q.Coupon.clone(db),
 		MediaAsset:        q.MediaAsset.clone(db),
 		Notification:      q.Notification.clone(db),
 		Order:             q.Order.clone(db),
@@ -129,6 +138,7 @@ func (q *Query) clone(db *gorm.DB) *Query {
 		User:              q.User.clone(db),
 		UserCommentAction: q.UserCommentAction.clone(db),
 		UserContentAction: q.UserContentAction.clone(db),
+		UserCoupon:        q.UserCoupon.clone(db),
 	}
 }
 
@@ -148,6 +158,7 @@ func (q *Query) ReplaceDB(db *gorm.DB) *Query {
 		ContentAccess:     q.ContentAccess.replaceDB(db),
 		ContentAsset:      q.ContentAsset.replaceDB(db),
 		ContentPrice:      q.ContentPrice.replaceDB(db),
+		Coupon:            q.Coupon.replaceDB(db),
 		MediaAsset:        q.MediaAsset.replaceDB(db),
 		Notification:      q.Notification.replaceDB(db),
 		Order:             q.Order.replaceDB(db),
@@ -161,6 +172,7 @@ func (q *Query) ReplaceDB(db *gorm.DB) *Query {
 		User:              q.User.replaceDB(db),
 		UserCommentAction: q.UserCommentAction.replaceDB(db),
 		UserContentAction: q.UserContentAction.replaceDB(db),
+		UserCoupon:        q.UserCoupon.replaceDB(db),
 	}
 }
 
@@ -170,6 +182,7 @@ type queryCtx struct {
 	ContentAccess     *contentAccessQueryDo
 	ContentAsset      *contentAssetQueryDo
 	ContentPrice      *contentPriceQueryDo
+	Coupon            *couponQueryDo
 	MediaAsset        *mediaAssetQueryDo
 	Notification      *notificationQueryDo
 	Order             *orderQueryDo
@@ -183,6 +196,7 @@ type queryCtx struct {
 	User              *userQueryDo
 	UserCommentAction *userCommentActionQueryDo
 	UserContentAction *userContentActionQueryDo
+	UserCoupon        *userCouponQueryDo
 }
 
 func (q *Query) WithContext(ctx context.Context) *queryCtx {
@@ -192,6 +206,7 @@ func (q *Query) WithContext(ctx context.Context) *queryCtx {
 		ContentAccess:     q.ContentAccess.WithContext(ctx),
 		ContentAsset:      q.ContentAsset.WithContext(ctx),
 		ContentPrice:      q.ContentPrice.WithContext(ctx),
+		Coupon:            q.Coupon.WithContext(ctx),
 		MediaAsset:        q.MediaAsset.WithContext(ctx),
 		Notification:      q.Notification.WithContext(ctx),
 		Order:             q.Order.WithContext(ctx),
@@ -205,6 +220,7 @@ func (q *Query) WithContext(ctx context.Context) *queryCtx {
 		User:              q.User.WithContext(ctx),
 		UserCommentAction: q.UserCommentAction.WithContext(ctx),
 		UserContentAction: q.UserContentAction.WithContext(ctx),
+		UserCoupon:        q.UserCoupon.WithContext(ctx),
 	}
 }