when I do a redirect, there is an error undefined method `empty?' for 15:Fixnum

Question

when I do a redirect, there is an error undefined method `empty?' for 15:Fixnum

I updated rails with 4.0.0 before 4.0.3 version. Now tormented by this bug.

What could it be?

projects_controller.rb

def create
    @project = Project.new(permited_params)

  if @project.save
    current_user.set_role :owner, @project
    redirect_to project_memberships_url(@project)
  else
    render :new
  end
end

redirect_to project_memberships_url(@project) the error here.

stacktrace Gist

Answer 1

Update to_param in the Project model as below:

def to_param
  id.to_s
end

to_param should return a String and not a Fixnum.