Rails - Mar 2012 - update a list of model instances and their associations

I have been unable to figure out how to update a list of model
instances and their associations and I have looked in the
documentation, which doesnt give an example of what I am trying to do:

http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-fields_for

I would assume this is a common task though.

I have an established association:

class AlertRule < ActiveRecord::Base

    has_many :notification_emails, :dependent => :destroy
    accepts_nested_attributes_for :notification_emails
end

class NotificationEmail < ActiveRecord::Base
  belongs_to :alert_rule
end


Controller:

def alerts_config

      //more code
      @alert_rules = alert_rules.flatten
      @alert_rules.each { |a| a.notification_emails.build }

      render :partial => ''home/alerts_config'', :layout
=> false


View:

= form_tag ''/home/save_alerts_config/'' + @unit.id.to_s,
:remote =>
true, :class => ''ajaxForm'' do
      %table.scrollTable{:cellspacing => "0", :width =>
"740px", :style => "border-collapse: collapse; border-spacing:
0;"}
        %thead.fixedHeader
          %tr
            %th Alerts
            %th Enable
            %th Primary Email
            %th Notification Emails
            %th
        %tbody.scrollContent
          - for rule in @alert_rules
            = fields_for :alert_rules, rule do |f|
              %tr
                %td= rule.alert_code.name
                %td= check_box_tag "enabled_ids[]", rule.id
                %td= f.text_field :email, :value => rule.email, :index
=> rule.id
                %td.fields
                  = f.fields_for :notification_emails do |
notification_builder|
                    = notification_builder.text_field :email
                    notification_builder.hidden_field :_destroy
                    = link_to_function ''Remove Notification'',
''remove_notifications(this)''
      .save_panel
        = submit_tag "Save", :class => ''submit
myButton''

I look at the name attribute of one of the notification email fields,
and it looks like this:

<input id="alert_rules_notification_emails_attributes_0_email"
name="alert_rules[notification_emails_attributes][0][email]"
size="30"
type="text">

However, it should look like this:

<input id="alert_rules_notification_emails_attributes_0_email"
name="alert_rules[51][notification_emails_attributes][0][email]"
size="30" type="text">

So what is missing is the association between this alert rule and its
notification emails. I am not sure how to make it look like the above.
But because it doesnt contain the id in brackets of the alert rule,
when I post, i get this back:

Started POST "/home/save_alerts_config/6243" for 127.0.0.1 at
2012-03-21 15:12:22 -0400
  Processing by HomeController#save_alerts_config as
  Parameters: {"utf8"=>"✓",
"authenticity_token"=>"7y9qukke1n35xTXaWPPL9deTmgQq096wqh+H1APeSAk=",
"enabled_ids"=>["51", "52"],
"alert_rules"=>{"51"=>{"email"=>"hythy"},
"notification_emails_attributes"=>{"0"=>{"email"=>"",
"_destroy"=>"false"}},
"52"=>{"email"=>"yutu"},
"53"=>{"email"=>"ytuytu"},
"54"=>{"email"=>""},
"55"=>{"email"=>""},
"56"=>{"email"=>""},
"57"=>{"email"=>""},
"58"=>{"email"=>""},
"59"=>{"email"=>""},
"60"=>{"email"=>""},
"61"=>{"email"=>""},
"62"=>{"email"=>""},
"63"=>{"email"=>""},
"64"=>{"email"=>""},
"65"=>{"email"=>""},
"66"=>{"email"=>""},
"67"=>{"email"=>""},
"68"=>{"email"=>""},
"69"=>{"email"=>""},
"70"=>{"email"=>""},
"71"=>{"email"=>""},
"72"=>{"email"=>""},
"73"=>{"email"=>""},
"74"=>{"email"=>""},
"75"=>{"email"=>""},
"76"=>{"email"=>""},
"77"=>{"email"=>""},
"78"=>{"email"=>""},
"79"=>{"email"=>""},
"80"=>{"email"=>""},
"81"=>{"email"=>""},
"82"=>{"email"=>""},
"83"=>{"email"=>""},
"84"=>{"email"=>""},
"85"=>{"email"=>""},
"86"=>{"email"=>""},
"87"=>{"email"=>""},
"88"=>{"email"=>""},
"89"=>{"email"=>""},
"90"=>{"email"=>""},
"91"=>{"email"=>""}},
"id"=>"6243"}

It has this:

"52"=>{"email"=>"yutu"}

thats supposed to be another alert rule, not a notification email of
alert rule 51, and this occurs because the name attribute is not
including the id of the alert rule of the notification email.

thanks at all for any possible workaround for this

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