form_for not showing up

Question

I have a model called "ExpDemo" and want to use it from "MainController."

I setup the code like this:

main_controller.rb

def pre
  @demo = ExpDemo.new
end

main/pre.html.erb

<% form_for(@demo) do |f| %>
  ...
<% end %>

Until here, I experienced 'path' error.

undefined method `exp_demos_path'

So, I added following to routes.rb and the error message gone.

resources :exp_demos

Now, the form is not showing up in the HTML page. I think the routing setup is the problem, but I'm not sure how to fix it. Please help me to resolve this issue.

Answer 1

you forgot an = for the form_for

<%= form_for(@demo) do |f| %>