I've run across a bug with polymorphic_url, which I have reported
here:
http://rails.lighthouseapp.com/projects/8994/tickets/411-polymorphic_path-breaks-on-uncountable-resources

The gist of the problem is that passing an uncountable resource (such
as an AR Model called Sheep) causes the method to throw an exception.
The reason for this is because when you map an uncountable resource,
you pass in a :singular option. Something like:

map.resources :sheep, :singular => :sheep_instance

That generates helpers called sheep_instance_url,
edit_sheep_instance_url, etc.

This becomes an issue for polymorphic_url as it tries to call the
named route helper, but has no good way of looking up the appropriate
helper. polymorphic_url consults RecordIdentifier, which will try to
get the singular name of the model. When this is done for an
uncountable model the singular and plural name are the same and
build_named_route_call will generate the wrong name for the helper (in
the example, if you try polymorphic_url(@sheep) it will try to call
sheep_url, when it should be calling sheep_instance_url). I don't see
any good way on checking what the named_routes for an uncountable
resource are...

Does anyone have any suggestions for fixing this bug?

Thanks,
Andy
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