[Rails] How to differentiate the form_for with respect to routes

I have my devise routes as

get "/signup/employer" => "devise/registrations#new" ,:as=>:useremp
get "/signup/contractor" => "devise/registrations#new",:as=>
:usercontract

Both routes points to controller -> registrations and action -> new.When
i hit the URL /signup/employer then my form_for should have the field as
Employer and Contractor for /signup/contractor.

Need the form_for based on the routes,how to achieve this

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