#34132: Migration with CheckConstraint fails on PostgreSQL in PyPy with
psycopg2cffi due to AttributeError
-------------------------------------+-------------------------------------
Reporter: Henryk | Owner: nobody
Plötz |
Type: Bug | Status: new
Component: Database | Version: 4.1
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
== Description
`quote_value` in `django/db/backends/postgresql/schema.py` assigns to
`adapted.encoding`. This is not allowed in psycopg2cffi and raises an
AttributeError.
The code path was added in #31815
I'm not sure what the correct fix would be. Simply not assigning
`encoding` seems wrong. Is what the code tries even possible in cffi?
== Steps to reproduce
(I'm using poetry. Also needs `apt-get install libpq-dev pypy3 pypy3-dev`
or equivalent.)
{{{
poetry new demo
cd demo
poetry env use `which pypy3`
poetry add django psycopg2cffi
rm -rf demo
poetry run django-admin startproject demo
cd demo
poetry run ./manage.py startapp demo1
}}}
in `demo/settings.py` add
{{{
from psycopg2cffi import compat
compat.register()
}}}
and add `demo1` to `INSTALLED_APPS`
in `demo1/models.py` add
{{{
from django.db import models
# Create your models here.
class Demo1(models.Model):
dummy = models.CharField(max_length=23)
class Meta:
constraints = [
models.CheckConstraint(name="dummy",
check=models.Q(dummy__in=["a","b"]))
]
}}}
then run
{{{
poetry run ./manage.py makemigrations
}}}
The file `demo1/migrations/0001_initial.py` now contains
{{{
# Generated by Django 4.1.3 on 2022-11-02 10:25
from django.db import migrations, models
class Migration(migrations.Migration):
initial = True
dependencies = [
]
operations = [
migrations.CreateModel(
name='Demo1',
fields=[
('id', models.BigAutoField(auto_created=True,
primary_key=True, serialize=False, verbose_name='ID')),
('dummy', models.CharField(max_length=23)),
],
),
migrations.AddConstraint(
model_name='demo1',
constraint=models.CheckConstraint(check=models.Q(('dummy__in',
['a', 'b'])), name='dummy'),
),
]
}}}
Now configure settings for a postgres database (in `demo/settings.py`)
{{{
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql',
'NAME': 'demo',
"USER": "demo",
"PASSWORD": "XXXX",
"HOST": "XXXX",
}
}
}}}
and run
{{{
poetry run ./manage.py migrate
}}}
== Actual results
{{{
Operations to perform:
Apply all migrations: admin, auth, contenttypes, demo1, sessions
Running migrations:
Applying contenttypes.0001_initial... OK
Applying auth.0001_initial... OK
Applying admin.0001_initial... OK
Applying admin.0002_logentry_remove_auto_add... OK
Applying admin.0003_logentry_add_action_flag_choices... OK
Applying contenttypes.0002_remove_content_type_name... OK
Applying auth.0002_alter_permission_name_max_length... OK
Applying auth.0003_alter_user_email_max_length... OK
Applying auth.0004_alter_user_username_opts... OK
Applying auth.0005_alter_user_last_login_null... OK
Applying auth.0006_require_contenttypes_0002... OK
Applying auth.0007_alter_validators_add_error_messages... OK
Applying auth.0008_alter_user_username_max_length... OK
Applying auth.0009_alter_user_last_name_max_length... OK
Applying auth.0010_alter_group_name_max_length... OK
Applying auth.0011_update_proxy_permissions... OK
Applying auth.0012_alter_user_first_name_max_length... OK
Applying demo1.0001_initial...Traceback (most recent call last):
File "./manage.py", line 22, in <module>
main()
File "./manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-packages/django/core/management/__init__.py", line
446, in execute_from_command_line
utility.execute()
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-packages/django/core/management/__init__.py", line
440, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-packages/django/core/management/base.py", line 402,
in run_from_argv
self.execute(*args, **cmd_options)
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-packages/django/core/management/base.py", line 448,
in execute
output = self.handle(*args, **options)
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-packages/django/core/management/base.py", line 96,
in wrapped
res = handle_func(*args, **kwargs)
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-
packages/django/core/management/commands/migrate.py", line 354, in handle
fake_initial=fake_initial,
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-packages/django/db/migrations/executor.py", line
136, in migrate
state, plan, full_plan, fake=fake, fake_initial=fake_initial
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-packages/django/db/migrations/executor.py", line
168, in _migrate_all_forwards
state, migration, fake=fake, fake_initial=fake_initial
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-packages/django/db/migrations/executor.py", line
252, in apply_migration
state = migration.apply(state, schema_editor)
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-packages/django/db/migrations/migration.py", line
131, in apply
self.app_label, schema_editor, old_state, project_state
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-
packages/django/db/migrations/operations/models.py", line 1040, in
database_forwards
schema_editor.add_constraint(model, self.constraint)
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-packages/django/db/backends/base/schema.py", line
511, in add_constraint
sql = constraint.create_sql(model, self)
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-packages/django/db/models/constraints.py", line 83,
in create_sql
check = self._get_check_sql(model, schema_editor)
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-packages/django/db/models/constraints.py", line 76,
in _get_check_sql
return sql % tuple(schema_editor.quote_value(p) for p in params)
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-packages/django/db/models/constraints.py", line 76,
in <genexpr>
return sql % tuple(schema_editor.quote_value(p) for p in params)
File "/home/henryk/.cache/pypoetry/virtualenvs/demo-gWrR8tCo-
py3.8/lib/pypy3.8/site-packages/django/db/backends/postgresql/schema.py",
line 57, in quote_value
adapted.encoding = "utf8"
AttributeError: can't set attribute
}}}
== Expected results
No exception :)
--
Ticket URL: <https://code.djangoproject.com/ticket/34132>
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