diff options
Diffstat (limited to 'actionpack/lib/abstract_controller/collector.rb')
-rw-r--r-- | actionpack/lib/abstract_controller/collector.rb | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/actionpack/lib/abstract_controller/collector.rb b/actionpack/lib/abstract_controller/collector.rb index 09b9e7ddf0..ddd56b354a 100644 --- a/actionpack/lib/abstract_controller/collector.rb +++ b/actionpack/lib/abstract_controller/collector.rb @@ -23,7 +23,17 @@ module AbstractController protected def method_missing(symbol, &block) - mime_constant = Mime.const_get(symbol.upcase) + const_name = symbol.upcase + + unless Mime.const_defined?(const_name) + raise NoMethodError, "To respond to a custom format, register it as a MIME type first: " \ + "http://guides.rubyonrails.org/action_controller_overview.html#restful-downloads. " \ + "If you meant to respond to a variant like :tablet or :phone, not a custom format, " \ + "be sure to nest your variant response within a format response: " \ + "format.html { |html| html.tablet { ... } }" + end + + mime_constant = Mime.const_get(const_name) if Mime::SET.include?(mime_constant) AbstractController::Collector.generate_method_for_mime(mime_constant) |