Rails cache sweeper doesn’t work with nested models

This is for Ruby 1.8.7 & Rails 3.0.1. I have a model TeachingGroup, which belongs to current_user.current_term.

A Sweeper exists with:

class TeachingGroupSweeper < ActionController::Caching::Sweeper
  observe TeachingGroup

  def after_update(teaching_group)
    expire_cache_for(teaching_group) # elsewhere, working
  end
  ... # other actions, expire_cache_for method
end

Expiring the cache works fine for the create action, but not for destroy or update. The problem is this: In the controller, I fetch the TeachingGroup using the @current_term variable, to prevent users updating models that don't belong to them, like so:

def update
  @teaching_group = @current_term.teaching_groups.find(params[:id])
  if @teaching_group.update_attributes( params[:teaching_group] )
    flash[:notice] = "#{TeachingGroup.model_name.human} #{@teaching_group} aktualisiert."
  end
  respond_with @teaching_group, :location => edit_school_term_path(@current_term)
end

Now, this will not trigger the sweeper. If I change the line to:

@teaching_group = TeachingGroup.find(params[:id])

Everything works fine, but I lose the security. I tried adding

  observe TeachingGroup, current_user.current_term.teaching_groups

to the sweeper, but not surprisingly this doesn’t work. Am I doing something wrong, or is this a bug? Any help would be appreciated. Thanks!

ansaurus

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Rails cache sweeper doesn’t work with nested models

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