ruby on rails - sign_in form and sign_up form on homepage using form_tag -

This is a basic and common problem, and I want to clear it once and for all. (Tried days)

I have two forms, which are on the homepage (whos controller is static_pages_controller ). One form is to sign in, to sign the other. Uses create verb using

sign_in form sessions_controller . Uses users_controller using users_controller while using

form_tag . How you can specify the controller should go to it and what action should it take?

The following code is for the signup page: `

  & lt;% = form_tag (users_path)%> ; & Lt;% = label_tag: name% & gt; & Lt;% = text_field_tag: name% & gt; & Lt;% = label_tag: email% & gt; & Lt;% = text_field_tag: Email% & gt; & Lt;% = label_tag: Password% & gt; & Lt;% = password_field_tag: Password% & gt; & Lt;% = label_tag: password_confirmation, "confirmation"%> & Lt;% = password_field_tag: password_confirmation% & gt; & Lt;% = submit_tag "Create Your Account", Category: "BTN BTN-Big BTN-Primary"%> & Lt;% end% & gt; I know that there are options like  form_tag ({: controller = & gt; "user",: action = & gt; "create"}: method = & Gt; "post" ,: class = & gt; "nifty_product")  but none works for Sign_in also please help!   
 
 
 When the page presents, there will be an action in the HTML form. Depending on whether you are signing up or signing in, you can use Javascript to change the action for the form.