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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
docs/howto/custom-model-fields.txt
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@@ -483,7 +483,7 @@ instances::
class HandField(models.Field):
# ...
def from_db_value(self, value, connection):
def from_db_value(self, value, connection, context):
if value is None:
return value
return parse_hand(value)