warning for polymorphic + :include
Reported by Xavier Noria | December 24th, 2007 @ 12:46 PM | in Second Edition
A polymorphic association cannot be eager-loaded through :include because the query would need to put the association_type's table name in the very FROM/JOIN clauses, which is unknown so early. Pages 214--215.
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Xavier Noria January 23rd, 2008 @ 05:44 PM
That is no longer true in current edge due to a revision of the overall preloading strategy. See
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Obie