diff --git a/structs/storage/provider-article.go b/structs/storage/provider-article.go
index 6f61270..6afb73b 100644
--- a/structs/storage/provider-article.go
+++ b/structs/storage/provider-article.go
@@ -14,7 +14,7 @@ type ProviderArticleApi interface {
 	BatchUpdate(articles []v2.ProviderArticle) error
 	AutoMigrate() error
 	FindInBatches(query *GetProviderArticleQuery, results *[]v2.ProviderArticle, f func(tx *gorm.DB, batch int) error) error
-	ProviderPrice(query *GetProviderArticleQuery) (history v2.ProviderPrice, err error)
+	ProviderPrice(query *GetProviderArticleQuery) (history []v2.ProviderPrice, err error)
 }
 
 type providerArticleApi struct {
@@ -113,7 +113,7 @@ func (p *providerArticleApi) AutoMigrate() error {
 	return p.db.AutoMigrate(&v2.ProviderArticle{}, &v2.ProviderPrice{})
 }
 
-func (p *providerArticleApi) ProviderPrice(query *GetProviderArticleQuery) (history v2.ProviderPrice, err error) {
+func (p *providerArticleApi) ProviderPrice(query *GetProviderArticleQuery) (history []v2.ProviderPrice, err error) {
 	err = p.db.Scopes(query.Scope).Find(&history).Error
 	return
 }
diff --git a/structs/storage/seller-article.go b/structs/storage/seller-article.go
index cab65c5..de31fb2 100644
--- a/structs/storage/seller-article.go
+++ b/structs/storage/seller-article.go
@@ -13,7 +13,7 @@ type SellerArticleApi interface {
 	Update(sellerArticle v2.SellerArticle, selects ...string) error
 	FindInBatches(query *GetSellerArticleQuery, results *[]v2.SellerArticle, f func(tx *gorm.DB, batch int) error) error
 	AutoMigrate() error
-	SellerPrice(query *GetSellerArticleQuery) (history v2.SellerPrice, err error)
+	SellerPrice(query *GetSellerArticleQuery) (history []v2.SellerPrice, err error)
 }
 
 type sellerArticleApi struct {
@@ -109,7 +109,7 @@ func (p *sellerArticleApi) AutoMigrate() error {
 	return p.db.AutoMigrate(&v2.SellerArticle{}, &v2.SellerPrice{})
 }
 
-func (p *sellerArticleApi) SellerPrice(query *GetSellerArticleQuery) (history v2.SellerPrice, err error) {
+func (p *sellerArticleApi) SellerPrice(query *GetSellerArticleQuery) (history []v2.SellerPrice, err error) {
 	err = p.db.Scopes(query.Scope).Find(&history).Error
 	return
 }