问题
I developed a basic version of a Django app in SQLite3. Then, it came time to switch it to Postgres and put in production. When doing so, I noticed that I was able to create and run migrations for the new database.
However, when trying to run tests for the Postgres version, I run into an issue. Here it is.
I run tests with coverage run --source='.' manage.py test; however, the same thing happens when running via python manage.py test
Creating test database for alias 'default'...
Got an error creating the test database: database "test_app_web" already exists
Type 'yes' if you would like to try deleting the test database 'test_app_web', or 'no' to cancel: yes
Destroying old test database for alias 'default'...
Creating test database for alias 'extra'...
Traceback (most recent call last):
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/backends/utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
psycopg2.errors.UndefinedColumn: column aldryn_people_person.name does not exist
LINE 1: SELECT "aldryn_people_person"."id", "aldryn_people_person"."...
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "manage.py", line 20, in <module>
execute_from_command_line(sys.argv)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
utility.execute()
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/core/management/__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/core/management/commands/test.py", line 26, in run_from_argv
super().run_from_argv(argv)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/core/management/base.py", line 316, in run_from_argv
self.execute(*args, **cmd_options)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/core/management/base.py", line 353, in execute
output = self.handle(*args, **options)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/core/management/commands/test.py", line 56, in handle
failures = test_runner.run_tests(test_labels)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/test/runner.py", line 604, in run_tests
old_config = self.setup_databases()
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/test/runner.py", line 551, in setup_databases
self.parallel, **kwargs
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/test/utils.py", line 174, in setup_databases
serialize=connection.settings_dict.get('TEST', {}).get('SERIALIZE', True),
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/backends/base/creation.py", line 68, in create_test_db
run_syncdb=True,
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/core/management/__init__.py", line 148, in call_command
return command.execute(*args, **defaults)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/core/management/base.py", line 353, in execute
output = self.handle(*args, **options)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/core/management/base.py", line 83, in wrapped
res = handle_func(*args, **kwargs)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/core/management/commands/migrate.py", line 203, in handle
fake_initial=fake_initial,
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/migrations/executor.py", line 117, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/migrations/executor.py", line 147, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/migrations/executor.py", line 244, in apply_migration
state = migration.apply(state, schema_editor)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/migrations/migration.py", line 124, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/migrations/operations/special.py", line 190, in database_forwards
self.code(from_state.apps, schema_editor)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/aldryn_people/migrations/0007_copy_group.py", line 12, in fk_to_m2m
for person in Person.objects.all():
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/models/query.py", line 268, in __iter__
self._fetch_all()
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/models/query.py", line 1186, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/models/query.py", line 54, in __iter__
results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1065, in execute_sql
cursor.execute(sql, params)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/backends/utils.py", line 68, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/backends/utils.py", line 77, in _execute_with_wrappers
return executor(sql, params, many, context)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/backends/utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "/home/user/miniconda3/envs/app-web-test/lib/python3.7/site-packages/django/db/backends/utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: column aldryn_people_person.name does not exist
LINE 1: SELECT "aldryn_people_person"."id", "aldryn_people_person"."...
The app in question and the migration aldryn_people/migrations/0007_copy_group.py that is in process when the error appears is located here: https://github.com/divio/aldryn-people/blob/master/aldryn_people/migrations/0007_copy_group.py
The method which seems to be throwing the error is the following:
def fk_to_m2m(apps, schema_editor):
"""
Migrates any existing `group` to be the new, m2m `groups`
"""
Person = apps.get_model("aldryn_people", "Person")
for person in Person.objects.all():
if person.group:
person.groups.add(person.group)
person.save()
Further, I noticed that there was a similar issue reported here: Django relation error when running make migrations
However, I am unsure as to whether it is actually similar or just seems that way.
Any help on troubleshooting this is appreciated.
来源：https://stackoverflow.com/questions/61245569/django-psycopg2-error-when-running-migrations-in-testing