[Rails] "for column in..." not picking up _id columns

[Ryan]

My code executes fully:

  <% for column in ModelName.content_columns %>
    <th><%= column.human_name %></th>
  <% end %>

but it does not pick up any columns in my model's table that end in 
"_id".

Is this by design?

Is there a helper method that will reference the related tables?  Or 
will I need to code the column titles and detail records by hand?

Learning...

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