Rails - Jan 2008 - Cannot associate new records

After looking at a list of feeds, clicking on a specific feed gives an 
interface to assign a tag to that feed with checkboxes.  So far so good, 
but http://localhost:3000/feeds/add_some_tags/1 gives:

 ActiveRecord::HasManyThroughCantAssociateNewRecords in 
FeedsController#add_some_tags

Cannot associate new records through ''Feed#colors'' on
''#''. Both records
must have an id in order to create the has_many :through record 
associating them.


That''s all well and good, but both records do have an id, of course.  
However, how do I get those id''s and put them into the join table 
(colors)?  Now, this is getting interesting because it''s starting to
deal
with the db directly.  The models are at:  http://strawr.googlecode.com/
svn/trunk/app/models/ and look fine to me.



Part of the controller:



thufir@arrakis ~/Desktop/strawr $ 
thufir@arrakis ~/Desktop/strawr $ tail app/controllers/
feeds_controller.rb -n 20

def add_some_tags
  @feed = Feed.find(params[:id])
  @unused_tags     Tag.find(:all) - @feed.tags

  if @unused_tags.any?
    @tags_to_add = @unused_tags.select { |tag|
      (@params[''tag''+tag.id.to_s][''checked'']
== ''1'')}
    @tags_to_add.each { |tag|
      @feed.tags << Tag.find_or_create_by_tag(params[:which_tag])}
  end

  if @tags_to_add.any? and @feed.save
    flash[:notice] = ''Tags have been added!''
  end
  redirect_to :action => ''show'', :id => @feed
end

end
thufir@arrakis ~/Desktop/strawr $ 




thanks,

Thufir


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