我在models.py中创建了一个自定义User模型：
class User(AbstractUser):
pass
然后，我在settings.py：
中将AUTH_USER_MODEL设置为该模型
AUTH_USER_MODEL = 'workoutcal.User'
exercisecal包含在INSTALLED_APPS：
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'workoutcal',
'rest_framework',
'rest_framework_mongoengine',
]
我已将其包含在admin.py中：
admin.site.register(User, UserAdmin)
然后，我运行了makemigrations和migrate，对于后者，我得到了这个很长的错误追溯：
(workout) sahands-mbp:workout sahandzarrinkoub$ python manage.py migrate
Operations to perform:
Apply all migrations: admin, auth, contenttypes, sessions, workoutcal
Running migrations:
Applying admin.0001_initial...Traceback (most recent call last):
File "manage.py", line 22, in <module>
execute_from_command_line(sys.argv)
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/core/management/__init__.py", line 364, in execute_from_command_line
utility.execute()
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/core/management/__init__.py", line 356, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/core/management/base.py", line 283, in run_from_argv
self.execute(*args, **cmd_options)
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/core/management/base.py", line 330, in execute
output = self.handle(*args, **options)
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/core/management/commands/migrate.py", line 204, in handle
fake_initial=fake_initial,
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/db/migrations/executor.py", line 115, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/db/migrations/executor.py", line 145, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/db/migrations/executor.py", line 244, in apply_migration
state = migration.apply(state, schema_editor)
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/db/migrations/migration.py", line 129, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/db/migrations/operations/models.py", line 97, in database_forwards
schema_editor.create_model(model)
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 254, in create_model
definition, extra_params = self.column_sql(model, field)
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 144, in column_sql
db_params = field.db_parameters(connection=self.connection)
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/db/models/fields/related.py", line 994, in db_parameters
return {"type": self.db_type(connection), "check": self.db_check(connection)}
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/db/models/fields/related.py", line 991, in db_type
return self.target_field.rel_db_type(connection=connection)
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/db/models/fields/related.py", line 909, in target_field
return self.foreign_related_fields[0]
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/db/models/fields/related.py", line 653, in foreign_related_fields
return tuple(rhs_field for lhs_field, rhs_field in self.related_fields if rhs_field)
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/db/models/fields/related.py", line 640, in related_fields
self._related_fields = self.resolve_related_fields()
File "/Users/sahandzarrinkoub/Documents/Programming/Web/Django/workout/lib/python3.6/site-packages/django/db/models/fields/related.py", line 625, in resolve_related_fields
raise ValueError('Related model %r cannot be resolved' % self.remote_field.model)
ValueError: Related model 'workoutcal.User' cannot be resolved
在我看来，错误源于admin.0001_initial迁移。当我查看该迁移的python文件时，我发现：
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
import django.contrib.admin.models
from django.conf import settings
from django.db import migrations, models
class Migration(migrations.Migration):
dependencies = [
migrations.swappable_dependency(settings.AUTH_USER_MODEL),
('contenttypes', '__first__'),
]
operations = [
migrations.CreateModel(
name='LogEntry',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('action_time', models.DateTimeField(auto_now=True, verbose_name='action time')),
('object_id', models.TextField(null=True, verbose_name='object id', blank=True)),
('object_repr', models.CharField(max_length=200, verbose_name='object repr')),
('action_flag', models.PositiveSmallIntegerField(verbose_name='action flag')),
('change_message', models.TextField(verbose_name='change message', blank=True)),
('content_type', models.ForeignKey(
to_field='id',
on_delete=models.SET_NULL,
blank=True, null=True,
to='contenttypes.ContentType',
verbose_name='content type',
)),
('user', models.ForeignKey(
to=settings.AUTH_USER_MODEL,
on_delete=models.CASCADE,
verbose_name='user',
)),
],
options={
'ordering': ('-action_time',),
'db_table': 'django_admin_log',
'verbose_name': 'log entry',
'verbose_name_plural': 'log entries',
},
bases=(models.Model,),
managers=[
('objects', django.contrib.admin.models.LogEntryManager()),
],
),
]
我的错误是什么原因，我该如何解决？
编辑：Alasdair询问我的exercisecal应用程序是否有迁移。确实如此。 migrations-folder包含三个python文件：__初始化__。PY
# empty
0001_initial.py
# -*- coding: utf-8 -*-
# Generated by Django 1.11.5 on 2017-09-11 17:20
from __future__ import unicode_literals
from django.db import migrations, models
import django.db.models.deletion
class Migration(migrations.Migration):
initial = True
dependencies = [
]
operations = [
migrations.CreateModel(
name='Person',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('name', models.CharField(max_length=200)),
],
),
migrations.CreateModel(
name='Workout',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('date', models.DateTimeField(verbose_name='workout date')),
('person', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='workoutcal.Person')),
],
),
]
0002_auto_20171212_1445
# -*- coding: utf-8 -*-
# Generated by Django 1.11.5 on 2017-12-12 14:45
from __future__ import unicode_literals
import django.contrib.auth.models
import django.contrib.auth.validators
from django.db import migrations, models
import django.utils.timezone
class Migration(migrations.Migration):
dependencies = [
('auth', '0008_alter_user_username_max_length'),
('workoutcal', '0001_initial'),
]
operations = [
migrations.CreateModel(
name='User',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('password', models.CharField(max_length=128, verbose_name='password')),
('last_login', models.DateTimeField(blank=True, null=True, verbose_name='last login')),
('is_superuser', models.BooleanField(default=False, help_text='Designates that this user has all permissions without explicitly assigning them.', verbose_name='superuser status')),
('username', models.CharField(error_messages={'unique': 'A user with that username already exists.'}, help_text='Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only.', max_length=150, unique=True, validators=[django.contrib.auth.validators.UnicodeUsernameValidator()], verbose_name='username')),
('first_name', models.CharField(blank=True, max_length=30, verbose_name='first name')),
('last_name', models.CharField(blank=True, max_length=30, verbose_name='last name')),
('email', models.EmailField(blank=True, max_length=254, verbose_name='email address')),
('is_staff', models.BooleanField(default=False, help_text='Designates whether the user can log into this admin site.', verbose_name='staff status')),
('is_active', models.BooleanField(default=True, help_text='Designates whether this user should be treated as active. Unselect this instead of deleting accounts.', verbose_name='active')),
('date_joined', models.DateTimeField(default=django.utils.timezone.now, verbose_name='date joined')),
('groups', models.ManyToManyField(blank=True, help_text='The groups this user belongs to. A user will get all permissions granted to each of their groups.', related_name='user_set', related_query_name='user', to='auth.Group', verbose_name='groups')),
('user_permissions', models.ManyToManyField(blank=True, help_text='Specific permissions for this user.', related_name='user_set', related_query_name='user', to='auth.Permission', verbose_name='user permissions')),
],
options={
'verbose_name': 'user',
'verbose_name_plural': 'users',
'abstract': False,
},
managers=[
('objects', django.contrib.auth.models.UserManager()),
],
),
migrations.RemoveField(
model_name='workout',
name='person',
),
migrations.DeleteModel(
name='Person',
),
migrations.DeleteModel(
name='Workout',
),
]
答案 0 :(得分：1)
项目启动后很难更改AUTH_USER_MODEL。 See the note in the docs
如果您在数据库中没有任何重要数据，我会删除数据库，从workoutcal应用删除迁移，然后重新运行makemigrations和{{1} }。