Ruby on Rails：在表单提交后更新数据

Question

This is my form:

<table>
  <tbody>
  <% form_for :HhActiveCarrier, @carriers, :url => { :action => "update" } do |f| %>
  <% for carrier in @carriers %>
    <tr>
      <%= render :partial => "summary_detail", :locals => {:carrier => carrier, :f => f} %>
    </tr>
  <% end %>
  </tbody>
</table>
  <%= submit_tag "Update" %>
  <% end %>

With my partial:

<td class="tn"><%= h(carrier.name.to_s()) -%></td>
<td class="sc"><%= h(carrier.country.to_s()) -%></td>
<td class="sc"><%= select(:carrier, "country", @countries) -%></td>

This is the controller where I define the variables:

class ActiveCarriersController < ApplicationController

    def index
        @carriers = HhActiveCarrier.find(:all)
        for carrier in @carriers
            country = carrier["country"]
            if country.nil?
                carrier["country"] = "none"
            end
        end
        @countries = ["USA", "UK", "Canada"]
    end

    def update
        carriers = HhActiveCarrier.find(:all)
        for carrier in carriers
            carrier.update_attributes(params[:country])
        end
        redirect_to( :action => "index" )
    end

What I want to happen is after I click the "Update" button, I want the new country selected from the drop down list to be put into the HHActiveCarrier model. With the code I have right now, I get this error:

OCIError: ORA-00904: "ID": invalid identifier: UPDATE hh_active_carriers SET name = 'AT&T', country = null WHERE id = null

How would I go about updating the attributes this? I am using ruby on rails 2.3.8.

Edit:
Added parameters hash from development log:

parameters: {"commit"=>"Update", "carrier"=>{"country"=>"USA"}, "action"=>"update", "controller"=>"active_carriers"}

content_type: #

accepts: [#, #, #]

raw_post: "carrier%5Bcountry%5D=USA&carrier%5Bcountry%5D=USA&carrier%5Bcountry%5D=USA&carrier%5Bcountry%5D=USA&commit=Update"

query_parameters: {}

request_parameters: {"commit"=>"Update", "action"=>"update", "carrier"=>{"country"=>"USA"}, "controller"=>"active_carriers"}

Edit3:

Form:

<table>
  <tbody>
  <% form_for :HhActiveCarrier, :url => { :action => "update" } do |f| %>
  <% for carrier in @carriers %>
    <tr>
      <%= render :partial => "layouts/summary_detail", :locals => {:carrier => carrier, :f => f} %>
    </tr>
  <% end %>
  </tbody>
</table>
<%= submit_tag "Update" %>
<% end %>

Partial:

<td class="tn"><%= h(carrier.name.to_s()) %></td>
<td class="sc"><%= h(carrier.id.to_s()) %></td>
<td class="sc"><%= h(carrier.country.to_s()) %></td>
<td class="sc"><%= f.collection_select :country, HhActiveCarrier::COUNTRIES, :to_s, :to_s %></td>

Controller:

class ActiveCarriersController < ApplicationController

    def index
        @carriers = HhActiveCarrier.find(:all)
        for carrier in @carriers
            country = carrier["country"]
            if country.nil?
                carrier["country"] = "none"
            end
        end

    end


    def update
        #update code
        redirect_to( :action => "index" )
    end
end

Answer 1

A few things:

1. Adjust your form so it uses the fields_for helper for each of the carriers (scroll down almost 1/2 way, for the code snippet that's labeled "Or a collection to be used:")
2. Add a hidden field in your partial that indicates the ID of the carrier being updated (right now, your params hash doesn't include the ID of the record to be updated, so the update fails)
3. Don't loop through all carriers in your controller. You want to loop through the hash instead.

So, the hash you want from the form should look something like:

params => {:carrier[1] => {:country => "USA", :id=>"5"}, carrier[2] => {:country => "Brazil", :id=>"17"}}

Then in your controller, you would loop through params[:carrier].each to update your carriers.