Use arel for joining with rank table#576
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Fixes #206.
We faced the same problem as described in the linked issue - when active record creates an alias for one of the tables (the table for the top model or one of the joined tables) and the SQL query become invalid when trying to order or group etc.
The problem is here https://github.com/rails/rails/blob/d5afe4f6811c60dc1400c90624a1bbf77c572da6/activerecord/lib/active_record/associations/alias_tracker.rb#L33-L44
When passing a string JOIN, active record simply grep matches it to decide if aliases are needed, for safety. But when passing arel, it can make smarter decisions.