Don't omit order purchase on the transaction

api/db/transaction.go

@@ -28,7 +28,7 @@ type Transaction struct {
 
 	Purchase      []Purchase      `json:"purchase,omitempty"`
 	Topup         *Topup          `json:"topup,omitempty"`
-	OrderPurchase []OrderPurchase `json:"order_purchase,omitempty" gorm:"foreignKey:TransactionID;constraint:OnDelete:CASCADE"`
+	OrderPurchase []OrderPurchase `json:"order_purchase" gorm:"foreignKey:TransactionID;constraint:OnDelete:CASCADE"`
 	Order         *Order          `json:"order,omitempty" gorm:"constraint:OnDelete:CASCADE"`
 	OrderID       *uint           `json:"-"`
 	Refund        *Order          `json:"refund,omitempty" gorm:"foreignKey:TransactionID"`