Rails - Nov 2010 - How can I generate devise sign_in form within different controller?

I am trying to generate devise sign_in form, from the different
controller/views( which is called ''mains_controller'' in my
case)

I asked a question on stackoverflow.com but did not get the satisfiable
answer. You can read the specific question in there.

http://stackoverflow.com/questions/4081744/devise-form-within-a-different-controller




I am stuck with the ''build_resource'' from devise. The
session_controller
which takes care of sign_in/sign_out has a method call called
''build_resource.'' It seems that build_resource creates a
adequate value
for ''resource'' and ''resource_name'' for
sign_in form.

<%= form_for(resource, :as => resource_name, :url =>
session_path(resource_name)) do |f| %>

But thats the case in devise related controllers. If i put
''build_resource'' line with in my own
''mains_controller'' it throws out
error saying that there is no such method like
''build_resource.''

How can I resolve this problem?
If I create a form inline ruby code, it seems that

  <% if devise_mapping.rememberable? -%>
    <p><%= f.check_box :remember_me %> <%= f.label :remember_me
%></p>
  <% end -%>

''devise_mapping'' part above does not work.

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