RoutesProxy

rubyonrails-talk
1

when passing an array as first argument to form_for, polymorphic_url checks if first index is an instance of ActionDispatch::Routing::RoutesProxy:

def polymorphic_url(record_or_hash_or_array, options = {})         if record_or_hash_or_array.kind_of?(Array)           record_or_hash_or_array = record_or_hash_or_array.compact           if record_or_hash_or_array.first.is_a? (ActionDispatch::Routing::RoutesProxy)             proxy = record_or_hash_or_array.shift           end           record_or_hash_or_array = record_or_hash_or_array[0] if record_or_hash_or_array.size == 1         end        ...

It later than calls a named route on routesproxy object if it is not nil:

(proxy || self).send(named_route, *args)

What exactly is RoutesProxy?

The documentation does a terrible job at explaining it:

http://rubydoc.info/docs/rails/ActionDispatch/Routing/RoutesProxy

And at moment I'd prefer some feedback before digging into the source.

2

I would like to bump this. Simple question. When will the first element of an array passed as first argument to form_for ever be an instance of RoutesProxy? The rails source looks for this, so I am sure someone out there has examples.