我在我的小程序餐厅应用程序中有一个如下所示的数据结构作为状态:
{:orders {:e4d55743-c964-48e8-9cd1-cb1cf9075617 [#:helloworld.restaurant{:name "chilly parotta", :quantity 3} #:helloworld.restaurant{:name "masal dosa", :quantity 2}]}, :menu {:kothu-parotta #:helloworld.restaurant{:name "Kothu Parotta", :price 9.5, :quantity 50}, :butter-naan #:helloworld.restaurant{:name "Butter Naan", :price 3, :quantity 50}, :paneer-butter-masala #:helloworld.restaurant{:name "Paneer Butter Masala", :price 9.5, :quantity 50}}}
我有一个函数来更新订单中每个订单项对应的菜单项,从库存中减去订单数量并返回新的菜单。我想验证:
- 订单项中的项目应在菜单中存在
- 库存中的项目数量应大于订单数量
我有以下规范(注意:目前没有验证第2条)。当我运行此函数调用时,update-menu-item-for-order-item函数不能验证我的谓词1。我在fdef规范中犯了什么错误?
(s/def ::name string?)
(s/def ::price number?)
(s/def ::quantity number?)
(s/def ::order-item (s/keys :req [::name ::quantity]))
(s/def ::order-items (s/coll-of ::order-item))
(s/def ::menu-item (s/keys :req [::name ::price ::quantity]))
(s/def ::menu-item-id keyword?)
(s/def ::menu (s/map-of ::menu-item-id ::menu-item))
(s/fdef restaurant-save-menu :args (s/cat :menu-items (s/coll-of ::menu-item)))
(s/fdef update-menu-item-for-order-item
:args (s/and (s/cat :menu ::menu :order-item ::order-item)
#(contains? (:menu %) (keyword (slugify (::name (:order-item %))))))
:ret ::menu)
(stest/instrument `update-menu-item-for-order-item)
(stest/instrument `restaurant-save-menu)