Django在外键中用户迁移模型失败 [英] Django migrate model with user in a foreignkey fails
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问题描述
我试图迁移我的django模型:
Im trying to migrate my django model:
from django.contrib.auth.models import User
class Post(models.Model):
headline = models.CharField(max_length=200)
slug = models.SlugField(max_length=200)
body = models.TextField(blank=True, null=True)
author = models.ForeignKey(User, null=True, blank=True)
我创建了模型后添加了作者字段。
I added the author field after I created the model.
这是迁移django创建的:
Here is the migration django creates:
# encoding: utf8
from django.db import models, migrations
class Migration(migrations.Migration):
dependencies = [('articles', '0002_auto')]
operations = [
migrations.AddField(
field = models.ForeignKey(to_field=u'id', to=u'auth.User', blank=True, null=True),
name = 'author',
model_name = 'post',
),
]
当我尝试运行时,这是我的追溯./manage.py migrate:
Here is my traceback when I try to run ./manage.py migrate:
Operations to perform:
Synchronize unmigrated apps: ckeditor, sessions, admin, messages, auth, staticfiles, contenttypes, django_extensions
Apply all migrations: articles
Synchronizing apps without migrations:
Creating tables...
Installing custom SQL...
Installing indexes...
Installed 0 object(s) from 0 fixture(s)
Running migrations:
Applying articles.0002_post_author...Traceback (most recent call last):
File "./manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/core/management/__init__.py", line 397, in execute_from_command_line
utility.execute()
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/core/management/__init__.py", line 390, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/core/management/base.py", line 242, in run_from_argv
self.execute(*args, **options.__dict__)
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/core/management/base.py", line 289, in execute
output = self.handle(*args, **options)
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/core/management/commands/migrate.py", line 116, in handle
executor.migrate(targets, plan, fake=options.get("fake", False))
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/db/migrations/executor.py", line 60, in migrate
self.apply_migration(migration, fake=fake)
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/db/migrations/executor.py", line 73, in apply_migration
migration.apply(project_state, schema_editor)
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/db/migrations/migration.py", line 80, in apply
operation.database_forwards(self.app_label, schema_editor, project_state, new_state)
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/db/migrations/operations/fields.py", line 22, in database_forwards
schema_editor.add_field(from_model, to_model._meta.get_field_by_name(self.name)[0])
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/db/backends/schema.py", line 349, in add_field
definition, params = self.column_sql(model, field, include_default=True)
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/db/backends/schema.py", line 105, in column_sql
db_params = field.db_parameters(connection=self.connection)
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/db/models/fields/related.py", line 1285, in db_parameters
return {"type": self.db_type(connection), "check": []}
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/db/models/fields/related.py", line 1276, in db_type
rel_field = self.related_field
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/db/models/fields/related.py", line 1183, in related_field
return self.foreign_related_fields[0]
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/db/models/fields/related.py", line 971, in foreign_related_fields
return tuple(rhs_field for lhs_field, rhs_field in self.related_fields)
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/db/models/fields/related.py", line 958, in related_fields
self._related_fields = self.resolve_related_fields()
File "/home/USER/.virtualenvs/PROJECT/src/django-trunk/django/db/models/fields/related.py", line 943, in resolve_related_fields
raise ValueError('Related model %r cannot been resolved' % self.rel.to)
ValueError: Related model u'auth.User' cannot been resolved
任何人都知道我在做错什么?
Anyone know what I'm doing wrong?
推荐答案
在这种情况下帮助了我:
What helped me in this situation:
- 删除除
__ init __。py
之外的所有迁移文件(/%prjname%/ migrations文件夹) -
python manage.py makemigrations
- code> python manage.py migrate
- Delete all migration files except
__init__.py
(/%prjname%/migrations folder) python manage.py makemigrations
python manage.py migrate
不知道确切的原因,但我试图使用由我的代码合作伙伴生成的文件,但没有解决。
Not sure about exact cause, but i tried to use files, generated by my code-partner and it didn't work out.
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