Rails - Jan 2008 - Filtering the data displayed in a list

Hi all,

I''d appreciate some guidance in the right way to filter the data
displayed in a list. I have two models, school and centre (centre
belongs_to school and school has_many centres). In the list action for
centres at the moment it shows all of the centres for all of the
schools. I would like to be able to add links on the page to allow the
user to choose either all centres (as at present) or just the centres
for a particular school. I have in mind links for "All centres | North
| South | East | West". I''d like to keep the result in the current
page so if there is a way to have the default to retrieve all centres
and the other links to retrieve the centres for the North, South, East
and West schools respectively that would do nicely.

I have put the relevant pieces of code for the centres controller and
the list view for centres (and happy to provide other code on
request). I could probably hack this to get a result but I''d really
like to understand the right way to do it.

Anyway, any help will be much appreciated.

Regards,


macfizz.
--

In app/controllers/centres_controller.rb:

  def list
    @centre_pages, @centres = paginate :centres, :per_page =>
150, :order => :name
    # use all_schools to get the list of schools
    # we can pick this up in views/centres/list.rhtml
    @all_schools = School.find(:all, :order => :code)
  end

In app/views/centres/list.rhtml:
<% for centre in @centres %>
  <tr valign="top" class="<%=
cycle(''list-line-odd'', ''list-line-even'')
%> ">
    <td>
      <span class="list-title"><%=h(centre.name)
%>&nbsp;[<%h(centre.school.code) %>]</span><br />
		<span class="list-actions">
			<%= link_to ''Show'', :action =>
''show'', :id => centre %>&nbsp;|
&nbsp;
      		<%= link_to ''Edit'', :action =>
''edit'', :id => centre %>&nbsp;|
&nbsp;
      		<%= link_to ''Delete'', { :action =>
''destroy'', :id =>
centre }, :confirm => "Are you sure?", :method => :post %>
		</span>
    </td>
    <td>
      <span class="list-name"><%= h(centre.fname)
%>&nbsp;<%h(centre.lname)%></span>
    </td>
  </tr>
<% end %>


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