Ruby on Rails simple_form_for all.each do

I am using Rails 3.0, Ruby 1.9.2 and the Plataformatec simple_form gem. This code works with a form_for but not simple_form_for:

<%= simple_form_for(@provider) do |f| %>
  <% Car.all.each do |c| %>
    <div>
      <%= check_box_tag :car_ids, c.id, @store.cars.include?(c), :name => 'store[car_ids][]' %>
      $<%= c.cost %> | <%= c.description %>
    </div>
  <% end %>
  <div class="actions">
    <%= f.submit "New" %>
  </div>
<% end %>

How do I get it to work with simple_form_for?

Thanks in advance!

You can't use simple_form right the same way as form_for.

For example ther is no any check_box_tag method in simple_form gem. There is ONLY inuput fields that you can specify with :as option. So your check_box_tag will be converted to

f.input car_ids, ..., :as => :check_box

Checkout Usage, Rdoc and other useful stuff https://github.com/plataformatec/simple_form

The problem was in the controller code.

In the "new" controller action I can't simply perform:

@provider = Provider.new(params[:provider])

as one would normally.

Instead I have to process each parameter separately:

@provider.location = params[:provider][:location] etc...

For the Car check boxes, I add each car_id from the car_ids parameter to the "has_many" cars model association one at a time:

car_ids = params[:provider][:car_ids]
car_ids.each do |cid|
  @provider.cars << Car.find(cid)
end

Then I can call:

@provider.save!

And it saves correctly (my initial problem was that it wasn't saving the selected Cars).

For some reason, I was able to figure this out only after posting the question here. Funny how that works.

Thanks all for your replies!