使check_box在Rails表单中工作

Question

My objective is to use a check box on the sign-in form to allow the user to choose to stay signed in after browser close. I'm using this code in the sign-in form for the check box (views > sessions > new.html.erb):

<div class="field">
  <%= f.check_box :stay_signed_in %> Stay signed in?
</div>

:stay_signed_in is therefore 1 if checked, and 0 if not. I then (attempt to) set a session variable :staysignedin to either true or false depending on the value of :stay_signed_in (in the sessions controller):

def create
  session[:staysignedin] = (params[:session][:stay_signed_in] == "1") ? true : false
  ...
end

There is something wrong with this code. Even when the box is checked and :stay_signed_in is definitely 1, session[:staysignedin] is never set to true. Where am I going wrong?

Edit: The rest of the sign-in form looks like this:

<%= form_for(:session, :url => sessions_path) do |f| %>

  <div class="field">
    <%= f.label :email %><br />
    <%= f.text_field :email %>
  </div>

  <div class="field">
    <%= f.label :password %><br />
    <%= f.password_field :password %>
  </div>

  <div class="field">
    <%= f.check_box :stay_signed_in %>
    Stay signed in on this computer?
  </div>

  <div class="actions">
    <%= f.submit "Sign in" %>
  </div>

<% end %>

Edit: correction: it IS setting session[:staysignedin] to be true or false correctly, so the fault must be elsewhere. The problem is that with 'stay signed in' checked, when I close the browser and reopen it, the user is not still signed in. When I remove the 'stay signed in?' check box on the sign in form and all the relevant code, leaving only the permanent sign-in code, it works fine.

def sign_in(user)
  if session[:staysignedin]
    cookies.permanent.signed[:remember_token] = [user.id, user.salt]
  else
    session[:userid] = user.id
  end
  self.current_user = user
end

def sign_out
  if session[:staysignedin]
    cookies.delete(:remember_token)
  else
    session[:userid] = nil
    session[:staysignedin] = nil
  end
  self.current_user = nil
end

Answer 1

What does the rest of your form code look like?

My guess is that :stay_signed_in is not storing to params[:session][:stay_signed_in] , but rather params[:something_else][:stay_signed_in] or just params[:stay_signed_in]

If you're running on local WEBrick you can see the parameters that are posted with each request, that will help you make sure you've got the right parameter key.

-EDIT-

Based on your last comment, I would recommend using Devise to handle your authentication logic. It is super-easy to implement, fully Rails 3 compatible, and includes built in code for handling sessions and remembering to stay logged in.

It's probably not worth your time to get stuck for this long on a simple sessions remembering issue when there's such a good plugin available that is lightweight, rock-solid, well-documented etc.

For an intro, see this Railscast .