Opened 11 months ago
Closed 11 months ago
#34928 closed Bug (duplicate)
makemigrations when adding a ForeignKey to a model with a UniqueConstraint must create the field before creating the constraint
Reported by: | yonatanramirez | Owned by: | nobody |
---|---|---|---|
Component: | Migrations | Version: | 4.2 |
Severity: | Normal | Keywords: | |
Cc: | Triage Stage: | Unreviewed | |
Has patch: | no | Needs documentation: | no |
Needs tests: | no | Patch needs improvement: | no |
Easy pickings: | no | UI/UX: | no |
Description
This issue looks like #25551 but with UniqueConstraint and not unique_together.
from django.db import models +class Author(models.Model): + name = models.CharField(max_length=255) + class Book(models.Model): name = models.CharField(max_length=255) + author = models.ForeignKey(Author, on_delete=models.CASCADE, null=True) + + class Meta: + constraints = [ + models.UniqueConstraint( + fields=['name', 'author'], + name='unique_book_name_author' + ) + ]
This is the output of the makemigration command
Migrations for 'issue': issue/migrations/0002_author_book_unique_book_name_author_book_author.py - Create model Author - Create constraint unique_book_name_author on model book - Add field author to book
And the portion of the migration file:
operations = [ migrations.CreateModel( name='Author', fields=[ ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')), ('name', models.CharField(max_length=255)), ], ), migrations.AddConstraint( model_name='book', constraint=models.UniqueConstraint(fields=('name', 'author'), name='unique_book_name_author'), ), migrations.AddField( model_name='book', name='author', field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, to='issue.author'), ), ]
The stacktrace:
Operations to perform: Apply all migrations: admin, auth, contenttypes, issue, 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 issue.0001_initial... OK Applying issue.0002_author_book_unique_book_name_author_book_author...Traceback (most recent call last): File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/db/models/options.py", line 681, in get_field return self.fields_map[field_name] ~~~~~~~~~~~~~~~^^^^^^^^^^^^ KeyError: 'author' During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/home/yramirez/playground/django/essai/manage.py", line 22, in <module> main() File "/home/yramirez/playground/django/essai/manage.py", line 18, in main execute_from_command_line(sys.argv) File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line utility.execute() File "/home/yramirez/.pyenv/versions/django/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/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/core/management/base.py", line 412, in run_from_argv self.execute(*args, **cmd_options) File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/core/management/base.py", line 458, in execute output = self.handle(*args, **options) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/core/management/base.py", line 106, in wrapper res = handle_func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/core/management/commands/migrate.py", line 356, in handle post_migrate_state = executor.migrate( ^^^^^^^^^^^^^^^^^ File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/db/migrations/executor.py", line 135, in migrate state = self._migrate_all_forwards( ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/db/migrations/executor.py", line 167, in _migrate_all_forwards state = self.apply_migration( ^^^^^^^^^^^^^^^^^^^^^ File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/db/migrations/executor.py", line 252, in apply_migration state = migration.apply(state, schema_editor) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/db/migrations/migration.py", line 132, in apply operation.database_forwards( File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/db/migrations/operations/models.py", line 1135, in database_forwards schema_editor.add_constraint(model, self.constraint) File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/db/backends/sqlite3/schema.py", line 562, in add_constraint self._remake_table(model) File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/db/backends/sqlite3/schema.py", line 331, in _remake_table self.create_model(new_model) File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/db/backends/base/schema.py", line 448, in create_model sql, params = self.table_sql(model) ^^^^^^^^^^^^^^^^^^^^^ File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/db/backends/base/schema.py", line 267, in table_sql constraints = [ ^ File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/db/backends/base/schema.py", line 268, in <listcomp> constraint.constraint_sql(model, self) File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/db/models/constraints.py", line 216, in constraint_sql fields = [model._meta.get_field(field_name) for field_name in self.fields] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/db/models/constraints.py", line 216, in <listcomp> fields = [model._meta.get_field(field_name) for field_name in self.fields] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/yramirez/.pyenv/versions/django/lib/python3.11/site-packages/django/db/models/options.py", line 683, in get_field raise FieldDoesNotExist( django.core.exceptions.FieldDoesNotExist: NewBook has no field named 'author'
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Duplicate of #34333, fixed in 4b1bfea2846f66f504265cec46ee1fe94ee9c98b (Django 5.0+).