#9961: select_related(depth=0) should be a no-op
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 Reporter:  rdaysky                       |       Owner:  nobody    
   Status:  new                           |   Milestone:            
Component:  Database layer (models, ORM)  |     Version:  1.0       
 Keywords:                                |       Stage:  Unreviewed
Has_patch:  1                             |  
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 The documentation does not define any behavior for
 queryset.select_related(depth=0). The implementation treats that as if the
 depth parameter were not set at all, selecting all related objects.

 I propose having queryset.select_related(depth=0) return the same
 queryset, unaltered. That does not break documented behavior because it is
 not documented in the first place.

 The reason is uniformity. Suppose I want to test how select_related
 affects performance. I add a constant and add
 select_related(depth=SELECT_RELATED_DEPTH) in several places. I want to
 benchmark the application with different values, but the existing
 implementation of select_related does not allow me to set a value that
 would disable select_related altogether.

 The patch is very simple, attaching.

-- 
Ticket URL: <http://code.djangoproject.com/ticket/9961>
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