Ruby on Rails

 am a beginner and I appreciate an answer to help me understand where my knowledge gap is:

The app is to display a post. The posts belong to a category (appetizers, entrees...) My thought was to use scopes to display all the appetizers on the posts in one view and then have the entrees in another view and so on.

The models:

class Post < ActiveRecord::Base  attr_accessible :body, :category_id, :title    belongs_to :category    scope :appetizers, -> { where(post.category.name => "Appetizers")}    end      class Category < ActiveRecord::Base  attr_accessible :name    has_many :posts  end       

In the view I want to loop through the posts where the category name is "Appetizers".

<table>    <tr>      <th>Title</th>      <th>Body</th>      <th>Category</th>    </tr>      <% @post.appetizers.each do |app| %>    <tr>      <td><%= app.title %></td>      <td><%= app.body %></td>      <td><%= app.category.name%></td>    </tr>    <% end %>   </table>   

I am getting an "undefined method" error. I have tried searching for an example here that explains what is a correct solution. I also tried creating a method in the Post model like this:

  def appetizers_list      @appetizer_list = Post.appetizers.all      end  

Then call the method in the view:

 <% @appetizer_list.each do |app| %>   <tr>   <td><%= app.title %></td>   <td><%= app.body %></td>   <td><%= app.category.name%></td>    </tr>  

Obviously I am confusing what needs to be done after creating the scope and how to get the view to "see" it. Or if I need a scope at all and it can be done in a more simple way.

So is there a best practices for retrieving subsets of data in rails and displaying them to the view?

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