Fix TypeError: Cannot visit Arel::SelectManager when executing a subquery with Arel #236
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When executing a subquery using Arel, a
TypeError: Cannot visit Arel::SelectManager
is raised if Arel::SelectManager is called internally.To fix this error, I have added a visit_Arel_SelectManager to arel_visitors_depth_first.rb and test. The implementation is based on https://github.com/rails/rails/blob/f6918a5b5d0b8c3a700513c2624cc195e0a78d14/activerecord/lib/arel/visitors/to_sql.rb#L358-L361