Undefined method `to' for nil:NilClass + devise + rails -

Undefined method `to' for nil:NilClass + devise + rails -

i using devise in rails application. users getting kind of error:

undefined method 'to' nil:nilclass method

def http_auth_header? devise.mappings[scope].to.http_authenticatable && !request.xhr? end

that devise itself.

how can resolve this?

i spent time prepare same issue.

i did custom stuff sessioncontroller :

resource = warden.authenticate!(:scope => "user", :recall => "#{controller_path}#failure")

and in fact, scope must be symbol :

resource = warden.authenticate!(:scope => :user, :recall => "#{controller_path}#failure")

so think provide scope string instead of symbol

hope helps ;)

ruby-on-rails devise