Newbie question: page navigation

Absolute beginner here - sorry if this the answer is obvious - but i
don’t know enough to search effectively !
I’ve started from generated scaffolding. There are now two routes to a
page that adds a ‘contact’ . When a contact is successfully added I
would like the system to return to the page that called it .
When I go into the add contact page I’m passing a parameter to
indicate where its come from :
<%=button_to 'New Contact ', :controller => “contacts” ,:action =>
‘new’ ,:from_folder=>‘1’%>
gives a url of http://localhost:3000/contacts/new?from_folder=1

I’ve changed the contacts controller create method as follows
def create
@contact = Contact.new(params[:contact])
@temp = params[:from_folder]

@temp = 1

if @contact.save
  flash[:notice] = 'Contact was successfully created.'
  if @temp == '1'
    redirect_to :controller => 'folders' ,:action => 'new'
   else
    redirect_to :controller => 'chs' ,:action => 'index'
  end
else
  render :action => 'new'
end

end

BUT this doesnt pick up the params[:from_folder] .
Firstly is this a sensible way to approach this ? or is there another
way ?
secondly - why isnt the controller seeing the parameter ?
The new contact form is still using

<%= start_form_tag :action => ‘create’ %>
<%= render :partial => ‘form’ %>
<%= submit_tag “Create” %>

Thanks in advance

Kath

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