--- a/app/models/tweet.rb	Thu Jun 23 01:47:33 2016 +0900
+++ b/app/models/tweet.rb	Sun Jun 26 16:46:02 2016 +0900
@@ -1,9 +1,17 @@
 class Tweet
   def timeline(options = {})
-    @timeline ||=
-      Rails.cache.fetch({ :timeline => @twitter_id, :options => options.dup }, :expires_in => 5.minutes) do
-        @client.user_timeline(@twitter_id, options)
-      end
+    start_client_config_id = @client_config_id
+
+    begin
+      @timeline ||=
+        Rails.cache.fetch({ :timeline => @twitter_id, :options => options.dup }, :expires_in => 5.minutes) do
+          @client.user_timeline(@twitter_id, options)
+        end
+    rescue Twitter::Error::TooManyRequests
+      next_client_config_id = @client_config_id + 1
+      init_client next_client_config_id
+      retry unless @client_config_id == start_client_config_id
+    end
   end
 
   def user
@@ -18,11 +26,20 @@
   end
 
   def initialize(twitter_id)
+    @client = init_client
+    @twitter_id = twitter_id
+  end
+
+  def init_client(config_id = 0)
+    @client_config_id = config_id
+    config_hash_key = "twitter#{config_id}".to_sym
+
+    return init_client(0) if $cfg[config_hash_key].nil?
+
     @client = Twitter::REST::Client.new do |config|
-      $cfg[:twitter].each do |cfg_key, cfg_value|
+      $cfg[config_hash_key].each do |cfg_key, cfg_value|
         config.public_send("#{cfg_key}=", cfg_value)
       end
     end
-    @twitter_id = twitter_id
   end
 end