黎曼中如何使用AND运算

Question

当两个条件都满足时，我有黎曼代码来触发电子邮件。所以我写了下面的代码。

(let [email (mailer {....email configuration})]
        (streams
    (where (service "log")
        (smap
          (fn [events]
           (let [count-of-failures (count (filter #(= "failed" (:Status %)) events) and (filter #(= "UK" (:Country %)) events))] ;Calculate the count for matched value
              (event
              {
                 :status "Failure"
                 :metric  count-of-failures 
                 :total-fail (>= count-of-failures 2)})))

          (where (and (= (:status event) "Failure")
                      (:total-fail event))


            (email "xxx@xx.com")
             )prn))))

一旦我开始执行clojure.lang.ArityException: Wrong number of args (3) passed to:，我就会遇到错误

任何人都可以在这里建议我使用AND操作的正确方法。

提前致谢

Answer 1

你给count 3 个参数 - 因此你得到错误。

为什么你会在基本信息... args (3) passed to: count 无法理解之前截断错误输出。

(let [email (mailer {....email configuration})]
  (streams
   (where (service "log")
          (smap
           (fn [events]
             (let [count-of-failures (count ; <--- count only takes one argument
                                      (filter #(= "failed" (:Status %)) events)
                                      and
                                      (filter #(= "UK" (:Country %)) events))] ;Calculate the count for matched value
               (event
                {:status "Failure"
                 :metric  count-of-failures
                 :total-fail (>= count-of-failures 2)})))

           (where (and (= (:status event) "Failure")
                       (:total-fail event))
                  (email "xxx@xx.com")) prn))))

---

从你的描述看不清楚，你的意思是：

(count (and (filter ...) (filter ...)) 

last not-nil 集合的计数是多少？

---

我想检查两个条件我的 Status 应该是 Failed 和我的国家应该是 UK 。如果那时应该触发一封电子邮件

这有帮助吗？ ：

(def event {:Status "failed" :Country "UK"}) ; example1
(some #(and (= "failed" (:Status %)) (= (:Country %) "UK")) [event])
; => true
(def event {:Status "failed" :Country "US"}) ; example2
(some #(and (= "failed" (:Status %)) (= (:Country %) "UK")) [event])
; => nil