add limit purchase

go/gopath/src/fohow.com/apps/controllers/order_controller/order_controller.go

@@ -52,6 +52,24 @@ func (self *OrderController) Create() {
 	//if user.IsBlackUser == 1 {
 	//	self.ReturnError(403, apps.AccountError, "", nil)
 	//}
+
+	if product.PurchaseLimitCount > 0 {
+		if product.PurchaseLimitCount < count {
+			self.ReturnError(403, []string{apps.OverLimitCount[0], fmt.Sprintf("该商品限购%d件", product.PurchaseLimitCount)}, "", nil)
+		} else {
+			purchaseTotalCount := order_model.GetOrderCountByPIdAndWxUId(pId, wxUId)
+			//历史已经买够到限购数量了
+			if product.PurchaseLimitCount <= purchaseTotalCount {
+				self.ReturnError(403, []string{apps.PurchasedReachLimit[0], fmt.Sprintf("该商品限购%d件", product.PurchaseLimitCount)}, "", nil)
+			}
+			//历史没买够数量，但是历史总数+想购买的数量 超过限购数量
+			if product.PurchaseLimitCount < (purchaseTotalCount + count) {
+				canBuyCount := product.PurchaseLimitCount - purchaseTotalCount
+				self.ReturnError(403, []string{apps.PurchasedReachLimit[0], fmt.Sprintf("您还可以购买%d件", canBuyCount)}, "", nil)
+			}
+		}
+	}
+
 	wxUser := user_model.GetWxUserById(wxUId, true)
 	if wxUser == nil {
 		self.ReturnError(403, apps.NoExist, "", nil)