[Rails] Rails 4.0 Example app - fields_for

So I have a rails 3.2.11 Example app that exhibits some simple core use cases and I am starting again under rails 4.0.0.beta1

    <div>
        <h2><%= f.label r %></h2>
        <%= f.fields_for :interactions, s.initialized_interactions() do |builder| %>
            <% role = builder.object.role %>
            <%= builder.hidden_field :role_id %>

            <div class="field">
                <%= builder.check_box :enable %>
                <%= builder.label :enable, role.name %>
            </div>
        <% end %>
    </div>

 So the above renders OK for 3.2 but under rails 4.0 'builder.object' is an array of role objects and of course it fails.

Any ideas ?

On Monday, 18 March 2013 19:32:57 UTC, jle...@socit.co.uk wrote:

Hi All,
I have 30 years as a self employed software engineer and have been experimenting with rails for several years but !!

I would have made considerably more progress and been able to give back to the community if only there was a demo application that was released with each new rails release.

I am sure that it would take no more than 15 minutes of someone within the core team to produce an app that provides just the basic of use cases:

1. Edit of multi-level nested attributes in a single form.
2. Edit several models on the same form.
3. Edit multiple records from a single model on the same form.
4. Basic authentication.
5. Digest authentication.

What do you think ?

P.S. On ubuntu using rvm Ruby 2.0 and Rails 4.0.0.beta1 and Ruby Mine 5.0.2 the installation of each went without any problems.  I just cannot find how to implement the simple examples listed above with Rails 4.

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