#34877: KeyError for output_field in GeneratedField
-------------------------------------+-------------------------------------
Reporter: Paolo | Owner: nobody
Melchiorre |
Type: Bug | Status: new
Component: Database | Version: 5.0
layer (models, ORM) |
Severity: Release | Keywords: field, database,
blocker | generated, output_field
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
Trying to get SQL code for a migrations I receive a `KeyEorr`
**Model**
{{{#!python
from decimal import Decimal
from django.db import models
from django.db.models import F, Value as V
from django.db.models.functions import Round
class Item(models.Model):
price = models.DecimalField(max_digits=7, decimal_places=2)
vat_price = models.GeneratedField(
db_persist=True,
expression=Round(F("price") * V(Decimal("1.22")), 2),
output_field=models.DecimalField(max_digits=8, decimal_places=2),
)
}}}
**Step**
{{{#!bash
$ python -m manage makemigrations
$ python -m manage sqlmigrate shop 0001
}}}
**Traceback**
{{{#!pycon
Traceback (most recent call last):
File "<frozen runpy>", line 198, in _run_module_as_main
File "<frozen runpy>", line 88, in _run_code
File "/home/paulox/Projects/generatedfield/manage.py", line 22, in
<module>
main()
File "/home/paulox/Projects/generatedfield/manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "/home/paulox/Projects/generatedfield/.venv/lib/python3.11/site-
packages/django/core/management/__init__.py", line 442, in
execute_from_command_line
utility.execute()
File "/home/paulox/Projects/generatedfield/.venv/lib/python3.11/site-
packages/django/core/management/__init__.py", line 436, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/paulox/Projects/generatedfield/.venv/lib/python3.11/site-
packages/django/core/management/base.py", line 412, in run_from_argv
self.execute(*args, **cmd_options)
File "/home/paulox/Projects/generatedfield/.venv/lib/python3.11/site-
packages/django/core/management/commands/sqlmigrate.py", line 38, in
execute
return super().execute(*args, **options)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/paulox/Projects/generatedfield/.venv/lib/python3.11/site-
packages/django/core/management/base.py", line 458, in execute
output = self.handle(*args, **options)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/paulox/Projects/generatedfield/.venv/lib/python3.11/site-
packages/django/core/management/commands/sqlmigrate.py", line 80, in
handle
sql_statements = loader.collect_sql(plan)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/paulox/Projects/generatedfield/.venv/lib/python3.11/site-
packages/django/db/migrations/loader.py", line 381, in collect_sql
state = migration.apply(state, schema_editor, collect_sql=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/paulox/Projects/generatedfield/.venv/lib/python3.11/site-
packages/django/db/migrations/migration.py", line 132, in apply
operation.database_forwards(
File "/home/paulox/Projects/generatedfield/.venv/lib/python3.11/site-
packages/django/db/migrations/operations/models.py", line 96, in
database_forwards
schema_editor.create_model(model)
File "/home/paulox/Projects/generatedfield/.venv/lib/python3.11/site-
packages/django/db/backends/base/schema.py", line 506, in create_model
self.deferred_sql.extend(self._model_indexes_sql(model))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/paulox/Projects/generatedfield/.venv/lib/python3.11/site-
packages/django/db/backends/base/schema.py", line 1595, in
_model_indexes_sql
output.extend(self._field_indexes_sql(model, field))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/paulox/Projects/generatedfield/.venv/lib/python3.11/site-
packages/django/db/backends/postgresql/schema.py", line 63, in
_field_indexes_sql
like_index_statement = self._create_like_index_sql(model, field)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/paulox/Projects/generatedfield/.venv/lib/python3.11/site-
packages/django/db/backends/postgresql/schema.py", line 88, in
_create_like_index_sql
db_type = field.db_type(connection=self.connection)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/paulox/Projects/generatedfield/.venv/lib/python3.11/site-
packages/django/db/models/fields/__init__.py", line 879, in db_type
return column_type % data
~~~~~~~~~~~~^~~~~~
File "/home/paulox/Projects/generatedfield/.venv/lib/python3.11/site-
packages/django/utils/datastructures.py", line 280, in __getitem__
value = super().__getitem__(key)
^^^^^^^^^^^^^^^^^^^^^^^^
KeyError: 'max_digits'
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/34877>
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