While trying to implement support for conditional GETting in a rest system, we have come across the fresh_when and stale? methods.
The following code works fine with 304 and not further rendering: if stale?(:etag => resource, :last_modified => resource.updated_at.utc) respond_to do |format| format.html # show.html.erb } end end
But accessing 1.xml will try to render the resource twice:
if stale?(:etag => resource, :last_modified => resource.updated_at.utc) respond_to do |format| format.html # show.html.erb format.xml { render :xml => @order.to_xml(:controller => self, :except => [:paid_at]) } end end
The error message:
ActionController::DoubleRenderError in OrdersController#show
Can only render or redirect once per action
RAILS_ROOT: /Users/guilherme/Documents/ruby/restfulie-test Application Trace | Framework Trace | Full Trace
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ base.rb:900:in `render_without_benchmark' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ benchmarking.rb:51:in `render' /Library/Ruby/Gems/1.8/gems/activesupport-2.3.4/lib/active_support/ core_ext/benchmark.rb:17:in `ms' /Library/Ruby/Gems/1.8/gems/activesupport-2.3.4/lib/active_support/ core_ext/benchmark.rb:10:in `realtime' /Library/Ruby/Gems/1.8/gems/activesupport-2.3.4/lib/active_support/ core_ext/benchmark.rb:17:in `ms' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ benchmarking.rb:51:in `render' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ base.rb:1331:in `send' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ base.rb:1331:in `perform_action_without_filters' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ filters.rb:617:in `call_filters' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ filters.rb:610:in `perform_action_without_benchmark' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ benchmarking.rb:68:in `perform_action_without_rescue' /Library/Ruby/Gems/1.8/gems/activesupport-2.3.4/lib/active_support/ core_ext/benchmark.rb:17:in `ms' /Library/Ruby/Gems/1.8/gems/activesupport-2.3.4/lib/active_support/ core_ext/benchmark.rb:10:in `realtime' /Library/Ruby/Gems/1.8/gems/activesupport-2.3.4/lib/active_support/ core_ext/benchmark.rb:17:in `ms' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ benchmarking.rb:68:in `perform_action_without_rescue' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ rescue.rb:160:in `perform_action_without_flash' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ flash.rb:146:in `perform_action' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ base.rb:532:in `send' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ base.rb:532:in `process_without_filters' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ filters.rb:606:in `process' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ base.rb:391:in `process' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ base.rb:386:in `call' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/ routing/route_set.rb:437:in `call'
Any suggestions?
Regards
