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Fixed #24020 -- Refactored SQL compiler to use expressions

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Refactored compiler SELECT, GROUP BY and ORDER BY generation.
While there, also refactored select_related() implementation
(get_cached_row() and get_klass_info() are now gone!).

Made get_db_converters() method work on expressions instead of
internal_type. This allows the backend converters to target
specific expressions if need be.

Added query.context, this can be used to set per-query state.

Also changed the signature of database converters. They now accept
context as an argument.
This commit is contained in:
Anssi Kääriäinen 2014-12-01 09:28:01 +02:00 • committed by Tim Graham
parent b8abfe141b
commit 0c7633178f
41 changed files with 970 additions and 1416 deletions
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2
django/db/models/query_utils.py
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@ -170,7 +170,7 @@ def select_related_descend(field, restricted, requested, load_fields, reverse=Fa
if not restricted and field.null:
return False
if load_fields:
if field.name not in load_fields:
if field.attname not in load_fields:
if restricted and field.name in requested:
raise InvalidQuery("Field %s.%s cannot be both deferred"
" and traversed using select_related"