I am using the Tracks Turnkey appliance, version 15.1.

Tracks allows tagging of action items and searching for those tags.  The 'starred' tag is built in and clicking on Starred in the top menu bar correctly returns a web page containing starred items from http://$TRACKSSERVER/todos/tag/starred.

Tracks also supports feeds for reporting task status as text or iCal objects.  The server provides constructed URLs for accessing these feeds.  Viewing the text feed for starred items uses the URL http://$TRACKSSERVER/todos.txt?tag=starred&token=$TRACKSTOKEN

However, trying to view this feed results in an error message.  The Tracks log shows the following in response to the request:

I, [2019-01-23T14:50:08.116570 #20719]  INFO -- : Started GET "/todos.txt?tag=starred&token=$TRACKSTOKEN" for $WEBCLIENT at 2019-01-23 14:50:08 -0500
I, [2019-01-23T14:50:08.119116 #20719]  INFO -- : Processing by TodosController#index as TEXT
I, [2019-01-23T14:50:08.119525 #20719]  INFO -- :   Parameters: {"tag"=>"starred", "token"=>"$TRACKSTOKEN"}
E, [2019-01-23T14:50:08.139435 #20719] ERROR -- : Mysql2::Error: Unknown column 'taggings.tag_id' in 'where clause': SELECT `todos`.* FROM `todos` INNER JOIN contexts c_hidden ON c_hidden.id = todos.context_id WHERE `todos`.`user_id` = 2 AND `todos`.`state` = 'active' AND (NOT(todos.state = 'project_hidden' OR (c_hidden.state = 'hidden' AND (todos.state = 'active' OR todos.state = 'deferred' OR todos.state = 'pending')))) AND (taggings.tag_id = 4)  ORDER BY todos.due IS NULL, todos.due ASC, todos.created_at ASC
I, [2019-01-23T14:50:08.140341 #20719]  INFO -- :   Rendered contexts/_context.text.erb (2.0ms)
I, [2019-01-23T14:50:08.140791 #20719]  INFO -- :   Rendered todos/index.text.erb (3.7ms)
I, [2019-01-23T14:50:08.141048 #20719]  INFO -- : Completed 500 Internal Server Error in 21ms (ActiveRecord: 2.5ms)
F, [2019-01-23T14:50:08.142705 #20719] FATAL -- : 
ActionView::Template::Error (Mysql2::Error: Unknown column 'taggings.tag_id' in 'where clause': SELECT `todos`.* FROM `todos` INNER JOIN contexts c_hidden ON c_hidden.id = todos.context_id WHERE `todos`.`user_id` = 2 AND `todos`.`state` = 'active' AND (NOT(todos.state = 'project_hidden' OR (c_hidden.state = 'hidden' AND (todos.state = 'active' OR todos.state = 'deferred' OR todos.state = 'pending')))) AND (taggings.tag_id = 4)  ORDER BY todos.due IS NULL, todos.due ASC, todos.created_at ASC):
    1: <%
    2:   todos_in_context = not_done_todos.select { |t| t.context_id == context.id }
    3:   if todos_in_context.length > 0
    4: -%> <%= context.name.upcase %>:
    5: <%= render :partial => "todos/todo", :collection => todos_in_context -%>
  app/views/contexts/_context.text.erb:2:in `_app_views_contexts__context_text_erb__515968339662070635_47432019401520'
  app/views/todos/index.text.erb:1:in `_app_views_todos_index_text_erb__2862269700048351187_47432024765020'
  app/controllers/todos_controller.rb:48:in `block (2 levels) in index'
  app/controllers/todos_controller.rb:29:in `index'

The taggings table does exist in the Tracks production database, and there is a tag_id field.  The constructed SQL statement doesn't reference this correctly.  It requires the following clause:

INNER JOIN taggings ON taggings.taggable_id  = todos.id

1. does anyone else have this problem?

2. could the bad SQL creation be due to a version issue with a gem?  I've gone through the source, but I'm not familiar with Ruby and it isn't clear to me how the SQL statements are templated and created.