#34570: QuerySet.defer() raises an AttributeError when the field is
ManyToManyField or GenericForeignKey
-------------------------------------+-------------------------------------
Reporter: Paco | Owner: nobody
MartÃnez |
Type: Bug | Status: new
Component: Database | Version: 4.2
layer (models, ORM) | Keywords: contenttypes,
Severity: Normal | defer, manytomanyfield,
Triage Stage: | genericforeignkey
Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
== In Version 4.2.1
Hello, when I try to defer a field that is a ''ManyToManyField'' or a
''GenericForeignKey'' it raises an AttributteError.
=== Having these three models:
{{{
from django.db import models
from django.contrib.contenttypes.fields import GenericForeignKey,
ContentType
class ModelA(models.Model):
name = models.CharField(max_length=100)
class ModelB(models.Model):
name = models.CharField(max_length=100)
model_a = models.ManyToManyField('ModelA')
class ModelC(models.Model):
name = models.CharField(max_length=100)
content_type = models.ForeignKey(ContentType, null=True,
on_delete=models.CASCADE)
object_id = models.PositiveIntegerField(null=True)
generic_model = GenericForeignKey('content_type', 'object_id')
}}}
== Traceback from a ManyToManyField:
{{{
>>> ModelB.objects.defer('model_a')
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/usr/local/lib/python3.11/site-
packages/django/db/models/query.py", line 374, in __repr__
data = list(self[: REPR_OUTPUT_SIZE + 1])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/query.py", line 398, in __iter__
self._fetch_all()
File "/usr/local/lib/python3.11/site-
packages/django/db/models/query.py", line 1881, in _fetch_all
self._result_cache = list(self._iterable_class(self))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/query.py", line 91, in __iter__
results = compiler.execute_sql(
^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/sql/compiler.py", line 1547, in execute_sql
sql, params = self.as_sql()
^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/sql/compiler.py", line 734, in as_sql
extra_select, order_by, group_by = self.pre_sql_setup(
^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/sql/compiler.py", line 84, in pre_sql_setup
self.setup_query(with_col_aliases=with_col_aliases)
File "/usr/local/lib/python3.11/site-
packages/django/db/models/sql/compiler.py", line 73, in setup_query
self.select, self.klass_info, self.annotation_col_map =
self.get_select(
^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/sql/compiler.py", line 256, in get_select
select_mask = self.query.get_select_mask()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/sql/query.py", line 772, in get_select_mask
return self._get_defer_select_mask(opts, mask)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/sql/query.py", line 728, in
_get_defer_select_mask
field = opts.get_field(field_name).field
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'ManyToManyField' object has no attribute 'field'
}}}
== Traceback from defering a GenericForeignKey:
{{{
>>> ModelC.objects.defer('generic_model')
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/usr/local/lib/python3.11/site-
packages/django/db/models/query.py", line 374, in __repr__
data = list(self[: REPR_OUTPUT_SIZE + 1])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/query.py", line 398, in __iter__
self._fetch_all()
File "/usr/local/lib/python3.11/site-
packages/django/db/models/query.py", line 1881, in _fetch_all
self._result_cache = list(self._iterable_class(self))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/query.py", line 91, in __iter__
results = compiler.execute_sql(
^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/sql/compiler.py", line 1547, in execute_sql
sql, params = self.as_sql()
^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/sql/compiler.py", line 734, in as_sql
extra_select, order_by, group_by = self.pre_sql_setup(
^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/sql/compiler.py", line 84, in pre_sql_setup
self.setup_query(with_col_aliases=with_col_aliases)
File "/usr/local/lib/python3.11/site-
packages/django/db/models/sql/compiler.py", line 73, in setup_query
self.select, self.klass_info, self.annotation_col_map =
self.get_select(
^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/sql/compiler.py", line 256, in get_select
select_mask = self.query.get_select_mask()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/sql/query.py", line 772, in get_select_mask
return self._get_defer_select_mask(opts, mask)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-
packages/django/db/models/sql/query.py", line 728, in
_get_defer_select_mask
field = opts.get_field(field_name).field
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'GenericForeignKey' object has no attribute 'field'
}}}
== PD:
In version 4.1.9 it is working without any error, but in versions 4.2.0
and 4.2.1 raises the ''AttributeError''
--
Ticket URL: <https://code.djangoproject.com/ticket/34570>
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