Change a route to a controller - ruby-on-rails-3

Question

I have a basic app and I'm trying to destroy a record in a table called meeting_participants based on both the meeting_id and participant_id (which are columns in meeting_participants).
I have changed the destroy action in my meeting_participants_controller, to accept the meeting_id and participant_id and then delete the appropriate record.
def destroy
session[:return_to] = request.referer
#meeting_participant = MeetingParticipant.find_by_meeting_id_and_participant_id(params[:meeting_id], params[:participant_id])
#meeting_participant.destroy
redirect_to session[:return_to]
end
I have a button in a view I would like to use to call the meeting_participants#destroy controller, using the following code.
<table>
<% #participants.each do |participant| %>
<tr>
<td><%= participant.name %></dt>
<td>
<% participant.meetings.each do |meeting| %>
<%= meeting.name %>
<%= button_to( "Remove Meeting",
{:controller => "meeting_participants",
:action => "destroy",
:meeting_id => meeting.id,
:participant_id => participant.id },
:method => :delete,
:confirm => "Are you sure?") %>
<br/>
<% end %>
</td>
</tr>
<% end %>
</table>
I think that I am successfully sending the correct participant_id and meeting_id parameters to the controller but I am getting a "No route matches" error because my route for meeting_participants#destroy is expecting a single :id parameter instead. rake routes gives...
meeting_participant DELETE /meeting_participants/:id(.:format) meeting_participants#destroy
Does anyone know of a way to change my route to expect the two new parameters instead of id? Or maybe there is a better approach altogether. I find routes very confusing.
Thanks.
My routes.rb files is...
MyApp::Application.routes.draw do
resources :meeting_participants
resources :participants
resources :meetings
end

Answer 1

I'd probably create a route to handle that request. Maybe something like:
match '/delete_meeting_participants/meeting/:meeting_id/participant/:participant_id' => 'meeting_participants#delete_meeting_participants', :as => 'delete_meeting_participants'
Then, in your controller you would have an action called delete_meeting_participants that has the same logic currently in your destroy action. Obviously you would have to update your button_to with the name of the newly created action.