Re: [Sqlalchemy-tickets] [sqlalchemy] #2815: any way to detect this cycle?

[sqlalchemy <mi...@zz...>]

#2815: any way to detect this cycle?
---------------------------+----------------------------------
      Reporter:  zzzeek    |      Owner:  zzzeek
          Type:  defect    |     Status:  new
      Priority:  high      |  Milestone:  0.8.xx
     Component:  sql       |   Severity:  minor - half an hour
    Resolution:            |   Keywords:
Progress State:  in queue  |
---------------------------+----------------------------------

Comment (by zzzeek):

 eh?  maybe

 {{{
 #!diff
 diff --git a/lib/sqlalchemy/sql/selectable.py
 b/lib/sqlalchemy/sql/selectable.py
 index e06262c..3ee0bfb 100644
 --- a/lib/sqlalchemy/sql/selectable.py
 +++ b/lib/sqlalchemy/sql/selectable.py
 @@ -1936,6 +1936,8 @@ class Select(HasPrefixes, SelectBase):

          def add(items):
              for item in items:
 +                if item is self:
 +                    raise exc.InvalidRequestError("boom")
                  if translate and item in translate:
                      item = translate[item]
                  if not seen.intersection(item._cloned_set):
 }}}

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Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2815#comment:1>
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