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Handles nested subqueries in Django 1.7.

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This commit is contained in:
Bertrand Bordage 2015-02-18 01:20:17 +01:00
parent 9e1447f6ff
commit beacea0a8b
1 changed files with 11 additions and 3 deletions
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14
cachalot/utils.py
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@ -7,7 +7,8 @@ from time import time
import django
from django.db import connections
from django.db.models.sql.where import ExtraWhere, SubqueryConstraint
if django.VERSION[:2] >= (1, 7):
DJANGO_GTE_1_7 = django.VERSION[:2] >= (1, 7)
if DJANGO_GTE_1_7:
from django.utils.module_loading import import_string
else:
from django.utils.module_loading import import_by_path as import_string
@ -79,8 +80,15 @@ def _find_subqueries(children):
for child in children:
if isinstance(child, SubqueryConstraint):
yield child.query_object.query
elif isinstance(child, tuple) and hasattr(child[-1], 'query'):
yield child[-1].query
else:
rhs = None
if DJANGO_GTE_1_7:
if hasattr(child, 'rhs'):
rhs = child.rhs
elif isinstance(child, tuple):
rhs = child[-1]
if hasattr(rhs, 'query'):
yield rhs.query
if hasattr(child, 'children'):
for grand_child in _find_subqueries(child.children):
yield grand_child