list post in categories

I have a a post model and a categories model

I want to show a list the all posts by category all on one page.

I am using has and belong_to in each model correctly.

I just cant fiqure out how to show them in my view.开发者_如何学JAVA

Want I need is

Category Name

• Post1
• Post2
• Post3

Category Name2

• Post1
• Post2
• Post3

etc...

Thanks

In your controller set @categories:

@categories = Category.find(:all, :include => :posts) # you may specify your conditions here
# :include is needed to avoid a query on each "category.posts" call later in the view

Then in the view:

<% for category in @categories %>
  <strong><%= category.name %></strong>
  <ul>
    <% for post in category.posts %>
      <li><%= post.name %></li>
    <% end %>
  </ul>
<% end %>