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POHow I get the Railscasts episode "#229: Polling for Changes" to work with a nested route?
 

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  1. POHow I get the Railscasts episode "#229: Polling for Changes" to work with a nested route?
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    <p>I have a rails 3 application very similar to the one in <a href="http://github.com/ryanb/railscasts-episodes/tree/master/episode-229" rel="nofollow noreferrer">Railscasts episode #229</a> the only difference is that in my code Articles is called Posts and I have a nested route:</p> <p>routes.rb:</p> <pre><code>Myapp::Application.routes.draw do resources :posts do resources :comments end root :to =&gt; "tags#index" end </code></pre> <p>I receive this error in the terminal:</p> <pre><code>[2010-09-13 00:22:13] ERROR NoMethodError: undefined method `page_cache_extension' for ActionController::Base:Class /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.0.0/lib/action_dispatch/middleware/static.rb:21:in `call' /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.0.0/lib/rails/application.rb:168:in `call' /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.0.0/lib/rails/application.rb:77:in `method_missing' /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.0.0/lib/rails/rack/log_tailer.rb:14:in `call' /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.2.1/lib/rack/content_length.rb:13:in `call' /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.2.1/lib/rack/handler/webrick.rb:52:in `service' /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service' /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run' /usr/local/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread' Started GET "/posts/comments.js?post_id=1&amp;after=1284333896" for 192.168.1.108 at 2010-09-13 00:22:15 +0000 Processing by PostsController#show as JS Parameters: {"post_id"=&gt;"1", "after"=&gt;"1284333896", "id"=&gt;"comments"} SQL (4.8ms) SELECT name FROM sqlite_master WHERE type = 'table' AND NOT name = 'sqlite_sequence' SQL (1.5ms) SELECT name FROM sqlite_master WHERE type = 'table' AND NOT name = 'sqlite_sequence' Post Load (0.7ms) SELECT "posts".* FROM "posts" WHERE ("posts"."id" = 0) LIMIT 1 Completed in 392ms ActiveRecord::RecordNotFound (Couldn't find Post with ID=comments): app/controllers/posts_controller.rb:8:in `show' Rendered /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/_trace.erb (11.4ms) Rendered /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (49.3ms) Rendered /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (92.4ms) </code></pre> <p>posts_controller.rb:8:</p> <pre><code>@post = Post.find(params[:id]) </code></pre> <p>Comments_Controller index method:</p> <p>def index @comments = Comment.where("post_id = ? and created_at > ?", params[:post_id], Time.at(params[:after].to_i + 1)) end</p> <p>application.js:</p> <pre><code>$(function() { if ($("#comments").length &gt; 0) { setTimeout(updateComments, 10000); } }); function updateComments () { var post_id = $("#post").attr("data-id"); if ($("#comments").length &gt; 0) { var after = $(".comment:last-child").attr("data-time"); } else { var after = "0"; } $.getScript("/comments.js?post_id=" + post_id + "&amp;after=" + after) setTimeout(updateComments, 10000); } </code></pre> <p>I have a hunch that the problem is the nested route. How do I get the Javascript in application.js to recognize the nested route?</p> <p>EDIT:</p> <p>posts/show.html.erb:</p> <pre><code>&lt;div id="post" data-id="&lt;%= @post.id %&gt;"&gt; &lt;%= link_to @post.title, @post %&gt; &lt;%= simple_format @post.content %&gt; &lt;p&gt;&lt;%= link_to "Back to Posts", posts_path %&gt;&lt;/p&gt; &lt;% unless @post.comments.empty? %&gt; &lt;h2&gt;&lt;%= pluralize(@post.comments.size, 'comment') %&gt;&lt;/h2&gt; &lt;div id="comments"&gt; &lt;%= render @post.comments %&gt; &lt;/div&gt; &lt;% end %&gt; &lt;/div&gt; &lt;div id="replyform"&gt; &lt;%= render "comments/form" %&gt; &lt;/div&gt; </code></pre> <p>comments/_form.html.erb:</p> <pre><code>&lt;%= form_for([@post, Comment.new], :html =&gt; { :multipart =&gt; true }) do |f| %&gt; &lt;fieldset&gt; &lt;fieldset id="optional"&gt; &lt;%= f.label :commenter, "name (optional)" %&gt; &lt;%= f.text_field :commenter, :placeholder =&gt; "name (optional)" %&gt; &lt;%= f.label :email, "email (optional)" %&gt; &lt;%= f.email_field :email, :placeholder =&gt; "email (optional)" %&gt; &lt;/fieldset&gt; &lt;/fieldset&gt; &lt;fieldset&gt; &lt;%= f.label :body, "reply " %&gt; &lt;%= f.text_area :body, :placeholder =&gt; "reply" %&gt; &lt;%= f.submit 'reply' %&gt; &lt;/fieldset&gt; &lt;% end %&gt; </code></pre> <p>After changing the line mentioned in application.js to:</p> <pre><code>$.getScript("/posts/" + post_id + "/comments/&amp;after=" + after) </code></pre> <p>I get the error in my terminal:</p> <pre><code>Started GET "/posts/1/comments/&amp;after=1284388076" for 192.168.1.108 at 2010-09-13 14:28:29 +0000 Processing by CommentsController#show as JS Parameters: {"post_id"=&gt;"1", "id"=&gt;"&amp;after=1284388076"} Completed in 28ms ActionView::MissingTemplate (Missing template comments/show with {:handlers=&gt;[:erb, :rjs, :builder, :rhtml, :rxml], :formats=&gt;[:js, :"*/*"], :locale=&gt;[:en, :en]} in view paths "/media/usb0/myapp/app/views"): Rendered /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/missing_template.erb within rescues/layout (5.9ms) </code></pre> <p>SECOND EDIT: comments/index.js.erb: </p> <pre><code>&lt;% unless @comments.empty? %&gt; $("#comments").append("&lt;%=raw escape_javascript(render(@comments)) %&gt;"); &lt;% end %&gt; </code></pre> <p>comments/show.js.erb:</p> <pre><code>$("#comments").append("&lt;%=raw escape_javascript(render(@comments)) %&gt;"); </code></pre> <p>comments_controller.rb:</p> <pre><code>def show @comments = Comment.where("post_id = ? and created_at &gt; ?", params[:post_id], Time.at(params[:after].to_i + 1)) end </code></pre>
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