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Description: El Dorado is a full-stack community web application written in Ruby/Rails.
Homepage: http://almosteffortless.com/eldorado/
Clone URL: git://github.com/trevorturk/el-dorado.git 
trying to avoid double-messages in chat when lots of people or people have 
slow connections. cheesy, but seems to work.
trevorturk (author)
Wed Oct 01 17:20:23 -0700 2008
commit  34fb972a824ea4ccb8f230b81ec89d85589a351d
tree    e96cf743ed300b645c09435451042ab81f901a05
parent  1d57455a322d5f52e95dfb4a9509e8e4b8ddf2b5
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app/controllers/messages_controller.rb 
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@@ -52,11 +52,18 @@ class MessagesController < ApplicationController
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   def refresh
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     @messages = Message.refresh(session[:message_id], current_user)
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-    session[:message_id] = @messages.map(&:id).max unless @messages.empty?
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-    if @messages
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+    if !@messages.empty?
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+      session[:message_id] = @messages.map(&:id).max
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       render :update do |page|
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-        page.insert_html :top, 'messages-index', :partial => 'messages', :object => @messages
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+        @messages.each do |message|
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+          page << "if ($('message-#{message.id}')){"
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+          page << '}else{'
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+          page.insert_html :top, 'messages-index', :partial => 'messages', :object => message
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+          page << '}'
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+        end
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       end
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+    else
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+      render :nothing => true
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     end
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   end
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