A chained custom field filter doesn't work for fields with format User.

Steps to reproduce:

Create a user custom field A (the format doesn't matter) and check Used as a filter¶

Create an issue custom field B with format User and check Used as a filter¶

On the My account page set the custom value A for your own account to an arbitrary value¶

Create an issue and select <> for the custom field B¶

Filter the issue list by the filter B's A and use the value you set on the My account page¶

Expected result:

• The issue is found

Actual result:

• The issue is not found

The reason is that the SQL that filters the issues contains a @WHERE customized_type='User'@. However, the correct clause would be @WHERE customized_type='Principal'@.

Here is a patch to fix the issue:

--- a/app/models/query.rb
+++ b/app/models/query.rb
@@ -1166,7 +1166,7 @@ class Query < ActiveRecord::Base
     end
 
     filter = available_filters[field]
-    target_class = filter[:through].format.target_class
+    target_class = filter[:through].format.target_class.base_class
 
     "#{queried_table_name}.id #{not_in} IN (" +
       "SELECT customized_id FROM #{CustomValue.table_name}" +

Best regards,
Thomas