Clojure luminus framework how to call mongodb connect with mount -

i started develop using clojure luminus framework mongodb (with monger library). hard understand how implement mount library start db connection.

i figured out code should put handler.clj 's init function.

but cannot figure out how tell mount start database connection.

please give me hand?

here gores development config.clj

    (ns vippro.config   (:require [selmer.parser :as parser]             [clojure.tools.logging :as log]             [vippro.dev-middleware :refer [wrap-dev]] ))  (def defaults   {:init    (fn []      (parser/cache-off!)      (log/info "\n-=[vippro started using development profile]=-"))    :middleware wrap-dev}) 

and in handler.clj 's init function

(defn init   "init called once when    app deployed servlet on    app server such tomcat    put initialization code here"   []   (when-let [config (:log-config env)]     (org.apache.log4j.propertyconfigurator/configure config))   (doseq [component (:started (mount/start))]     (log/info component "started"))   ((:init defaults))) 

my main problem how should call function init proper way

(defn connect! []   ;; tries mongo uri environment variable   (reset! db (-> (:database-url env) mg/connect-via-uri :db))) 

the mongodb database started automatically when set environment variable

export database_url="mongodb://127.0.0.1/dbname" 

and started ring server