Ruby on Rails

Using scaffold, I generated two models, Person and Offer, and the forms to manage them.  Offer has a belong_to association with Person.  After running the generator, all the forms immediately worked fine. 

But then I discovered an external requirement that the foreign key column in the offers table, which was named person_id per Rails conventions, needed to be renamed as worker_id.  Since then, the Offer forms don't work.  They evoke a variety of errors, all related to the renamed column.  It seems that the system no longer recognizes it as implementing the Offer to Person association.

I figure I need to make some declaration somewhere to restore this associative functionality, but I can't figure out how to do this.  Can you help?

Here are some details:

The generate commands I used were:

I tweaked the Offer forms a bit to show People's names in display pages and provide a drop-down on edit forms.  The tweaked Offer index.html.erb looked like this:

...
   <% @offers.each do |offer| %>
      <tr>
        <td><%= offer.terms %></td>
        <td><%= offer.person.name %></td>
        <td><%= link_to 'Show', offer %></td>
        <td><%= link_to 'Edit', edit_offer_path(offer) %></td>
        <td><%= link_to 'Destroy', offer, method: :delete, data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
...

and the tweaked Offer _form.html.erb looked like this:

At this point, everything worked fine. 

Then I wrote and executed this migration:

Since then, all of my Offer forms get errors, always related to the renamed foreign key column.  Here's the error for index.html.erb:

If I change the offending line to:
the page displays, but only the value of worker_id is displayed, not the name of the referenced Person.

The Offer edit form displays, including its dropdown box containing Person names.  But when I try to save an update, I get:

If I change these lines in _form.html.erb
to
the form still displays OK, but when I try to save an update, I get a different error:

~ Thanks in advance for your help
~ Ken