Rails core - Sep 2008 - Review: multiple named_scopes with duplicate :joins fixed

Hey guys,

We''ve been chaining lots of named-scopes for advanced searching, and
we''re getting killed by the table aliasing issues.  Often, multiple
named scopes have to join in the same model (User needs Profile a lot,
for example).  When you combine them... aliasing issues!

Can we get some help reviewing this patch, it''s our first submission
to core:

http://rails.lighthouseapp.com/projects/8994/tickets/1077-chaining-scopes-with-duplicate-joins-causes-alias-problem

Thanks!

-David Stevenson & Joseph Palermo
PivotalLabs

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