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PO2 instance variables of the same name in different controllers
 

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    <p>I finished Michael Hartl's Ruby on Rails Tutorial. Now I'm working on the suggested exercises. The application he builds is basically a Twitter clone where one can post Microposts and they appear in your feed <a href="http://ruby.railstutorial.org/chapters/user-microposts#fig-micropost_created" rel="nofollow">http://ruby.railstutorial.org/chapters/user-microposts#fig-micropost_created</a></p> <p>The main page is in <code>home.html.erb</code> from the StaticPagesController and features a Micropost textbox where one can post Microposts. The code for the textbox looks like so:</p> <pre><code>&lt;%= form_for(@micropost) do |f| %&gt; &lt;%= render 'shared/error_messages', object: f.object %&gt; &lt;div class="field"&gt; &lt;%= f.text_area :content, placeholder: "Compose new micropost..." %&gt; &lt;/div&gt; &lt;%= f.submit "Post", class: "btn btn-large btn-primary" %&gt; &lt;% end %&gt; </code></pre> <p>The <code>@micropost</code> variable is initialized in the StaticPagesController like so:</p> <pre><code>class StaticPagesController &lt; ApplicationController def home if signed_in? @micropost = current_user.microposts.build end end </code></pre> <p>Now inside the MicropostsController there's a create action like so:</p> <pre><code>def create @micropost = current_user.microposts.build(params[:micropost]) if @micropost.save flash[:success] = "Micropost created!" redirect_to root_url else @feed_items = [] render 'static_pages/home' end end </code></pre> <p>My question is what is the purpose of the first @micropost variable as opposed to the second?</p> <p>thanks, mike</p>
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