Connect to docker compose mongo service.

Author: hiroshi

app/models/topic.rb

@@ -0,0 +1,6 @@
+class Topic
+  include Mongoid::Document
+
+  field :title, type: String
+  validates :title, presence: true
+end

config/mongoid.yml

@@ -13,7 +13,7 @@ development:
       # Provides the hosts the default client can connect to. Must be an array
       # of host:port pairs. (required)
       hosts:
-        - localhost:27017
+        - mongo:27017
       options:
         # Note that all options listed below are Ruby driver client options (the mongo gem).
         # Please refer to the driver documentation of the version of the mongo gem you are using

docker-compose.yml

@@ -12,6 +12,9 @@ services:
     command: ['bundle', 'exec', 'rails', 's', '-b', '0.0.0.0']
     environment:
       RAILS_ENV: development
+  mongo:
+    image: mongo
+
 
 volumes:
   bundle: