Re: [Sqlalchemy-tickets] [sqlalchemy] #1418: Flexible deferred interface

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

#1418: Flexible deferred interface
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      Reporter:  guest        |      Owner:  zzzeek
          Type:  enhancement  |     Status:  new
      Priority:  medium       |  Milestone:  0.9.0
     Component:  orm          |   Severity:  major - 1-3 hours
    Resolution:               |   Keywords:
Progress State:  in queue     |
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Comment (by zzzeek):

 the challenge here is that when we create this load thing, there's some
 kind of object that the internals can query against, which is fast:

 {{{

 q = query(Entity).options(load(Entity).only("x", "y"))

 # then internally, somehow this works:
 current_path = PathContext(Entity, "z")

 # is "deferred", without us needing to iterate through Entity four times.
 # maybe if only() and other methods could load up the full loader strategy
 # internally - then we'd do away with the dictionary crap in
 StrategizedProperty.
 query.context.strategy(current_path)

 }}}

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Ticket URL: <http://www.sqlalchemy.org/trac/ticket/1418#comment:10>
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