Instead of giving up on custom mime types without blocks, Rails should
attempt to render the standard template. Currently you get this
useless exception, "Expected a block but none was given for custom
mime handler #{mime_type}"

I added a simple patch that tries to render the custom format's
template.

respond_to do |format|
  format.mobile # action.mobile.erb
  format.opml    # action.opml.builder
end

Ticket #8174 (http://dev.rubyonrails.org/ticket/8174)


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