django.core.exceptions.FieldDoesNotExist：model没有名为<function set_null =“”at =“”0x7fc5ae8836e0 =“”>的字段

时间：2015-11-30 18:05:27

标签： python django django-migrations

经过一些谷歌搜索并且只找到dead-end topic后，我仍然遇到了迁移问题。

我的模特：

if($url!='' && substr($url,0,4)!="mail" && substr($url,0,4)!="java" && array_key_exists($enurl,$found_urls)==0){

模型文件中的导入：

class CurationArticle(models.Model):

        title = models.CharField(max_length=150, null=True, blank=True)
        description = models.TextField(null=True, blank=True)
        link = models.CharField(max_length=255, null=True, blank=True)
        author = models.CharField(max_length=150, blank=True, null=True)
        author_link = models.CharField(max_length=255, blank=True, null=True)

        def __unicode__(self):
            return self.title

数据库：

from django.template.defaultfilters import date as _date
import datetime
from django.db import models
from django.utils.text import slugify
from redactor.fields import RedactorField

ForeignKey引用该模型：

create TABLE auth_group (
    id integer not null default nextval('auth_group_id_seq'::regclass),
    name varchar(80) not null,
    PRIMARY KEY (id)
);
CREATE UNIQUE INDEX auth_group_pkey ON auth_group (id);
CREATE UNIQUE INDEX auth_group_name_key ON auth_group (name);
CREATE INDEX auth_group_name_253ae2a6331666e8_like ON auth_group (name);
create TABLE auth_group_permissions (
    id integer not null default nextval('auth_group_permissions_id_seq'::regclass),
    group_id integer not null,
    permission_id integer not null,
    PRIMARY KEY (id),
    FOREIGN KEY (group_id) REFERENCES auth_group (id),
    FOREIGN KEY (permission_id) REFERENCES auth_permission (id)
);
CREATE UNIQUE INDEX auth_group_permissions_pkey ON auth_group_permissions (id);
CREATE UNIQUE INDEX auth_group_permissions_group_id_permission_id_key ON auth_group_permissions (group_id, permission_id);
CREATE INDEX auth_group_permissions_0e939a4f ON auth_group_permissions (group_id);
CREATE INDEX auth_group_permissions_8373b171 ON auth_group_permissions (permission_id);
create TABLE auth_permission (
    id integer not null default nextval('auth_permission_id_seq'::regclass),
    name varchar(255) not null,
    content_type_id integer not null,
    codename varchar(100) not null,
    PRIMARY KEY (id),
    FOREIGN KEY (content_type_id) REFERENCES django_content_type (id)
);
CREATE UNIQUE INDEX auth_permission_pkey ON auth_permission (id);
CREATE UNIQUE INDEX auth_permission_content_type_id_codename_key ON auth_permission (content_type_id, codename);
CREATE INDEX auth_permission_417f1b1c ON auth_permission (content_type_id);
create TABLE django_admin_log (
    id integer not null default nextval('django_admin_log_id_seq'::regclass),
    action_time timestamp with time zone not null,
    object_id text,
    object_repr varchar(200) not null,
    action_flag smallint not null,
    change_message text not null,
    content_type_id integer,
    user_id integer not null,
    PRIMARY KEY (id),
    FOREIGN KEY (content_type_id) REFERENCES django_content_type (id),
    FOREIGN KEY (user_id) REFERENCES main_useraccount (id)
);
CREATE UNIQUE INDEX django_admin_log_pkey ON django_admin_log (id);
CREATE INDEX django_admin_log_417f1b1c ON django_admin_log (content_type_id);
CREATE INDEX django_admin_log_e8701ad4 ON django_admin_log (user_id);
create TABLE django_content_type (
    id integer not null default nextval('django_content_type_id_seq'::regclass),
    app_label varchar(100) not null,
    model varchar(100) not null,
    PRIMARY KEY (id)
);
CREATE UNIQUE INDEX django_content_type_pkey ON django_content_type (id);
CREATE UNIQUE INDEX django_content_type_app_label_45f3b1d93ec8c61c_uniq ON django_content_type (model, #4);
create TABLE django_migrations (
    id integer not null default nextval('django_migrations_id_seq'::regclass),
    app varchar(255) not null,
    name varchar(255) not null,
    applied timestamp with time zone not null,
    PRIMARY KEY (id)
);
CREATE UNIQUE INDEX django_migrations_pkey ON django_migrations (id);
create TABLE django_session (
    session_key varchar(40) not null,
    session_data text not null,
    expire_date timestamp with time zone not null,
    PRIMARY KEY (session_key)
);
CREATE UNIQUE INDEX django_session_pkey ON django_session (session_key);
CREATE INDEX django_session_session_key_461cfeaa630ca218_like ON django_session (session_key);
CREATE INDEX django_session_de54fa62 ON django_session (expire_date);
create TABLE main_blogpost (
    id integer not null default nextval('main_blogpost_id_seq'::regclass),
    title varchar(150) not null,
    slug varchar(255),
    image varchar(100),
    created_at varchar(150),
    updated_at varchar(150),
    published boolean not null,
    author_id integer not null,
    open_graph_description text,
    content text,
    curation_article_id integer,
    PRIMARY KEY (id),
    FOREIGN KEY (#12) REFERENCES main_curationarticle (id),
    FOREIGN KEY (open_graph_description) REFERENCES main_useraccount (id)
);
CREATE UNIQUE INDEX main_blogpost_pkey ON main_blogpost (id);
CREATE UNIQUE INDEX main_blogpost_slug_key ON main_blogpost (slug);
CREATE INDEX main_blogpost_slug_6206488e633eef95_like ON main_blogpost (slug);
CREATE INDEX main_blogpost_4f331e2f ON main_blogpost (open_graph_description);
CREATE INDEX main_blogpost_8093b65d ON main_blogpost (#12);
create TABLE main_blogpost_categories (
    id integer not null default nextval('main_blogpost_categories_id_seq'::regclass),
    blogpost_id integer not null,
    blogpostcategory_id integer not null,
    PRIMARY KEY (id),
    FOREIGN KEY (blogpostcategory_id) REFERENCES main_blogpostcategory (id)
);
CREATE UNIQUE INDEX main_blogpost_categories_pkey ON main_blogpost_categories (id);
CREATE UNIQUE INDEX main_blogpost_categories_blogpost_id_blogpostcategory_id_key ON main_blogpost_categories (blogpost_id, blogpostcategory_id);
CREATE INDEX main_blogpost_categories_53a0aca2 ON main_blogpost_categories (blogpost_id);
CREATE INDEX main_blogpost_categories_fa55acd5 ON main_blogpost_categories (blogpostcategory_id);
create TABLE main_blogpostcategory (
    id integer not null default nextval('main_blogpostcategory_id_seq'::regclass),
    name varchar(150) not null,
    PRIMARY KEY (id)
);
CREATE UNIQUE INDEX main_blogpostcategory_pkey ON main_blogpostcategory (id);
create TABLE main_curationarticle (
    id integer not null default nextval('main_curationarticle_id_seq'::regclass),
    title varchar(150),
    description text,
    link varchar(255),
    author varchar(150),
    author_link varchar(255),
    PRIMARY KEY (id)
);
CREATE UNIQUE INDEX main_curationarticle_pkey ON main_curationarticle (id);
create TABLE main_newsletteraccount (
    id integer not null default nextval('main_newsletteraccount_id_seq'::regclass),
    email varchar(254) not null,
    created_at date not null,
    is_active boolean not null,
    frequency varchar(2) not null,
    PRIMARY KEY (id)
);
CREATE UNIQUE INDEX main_newsletteraccount_pkey ON main_newsletteraccount (id);
CREATE UNIQUE INDEX main_newsletteraccount_email_key ON main_newsletteraccount (email);
CREATE INDEX main_newsletteraccount_email_71d3d7a4170cd1fe_like ON main_newsletteraccount (email);
create TABLE main_useraccount (
    id integer not null default nextval('main_useraccount_id_seq'::regclass),
    password varchar(128) not null,
    last_login timestamp with time zone,
    email varchar(254) not null,
    first_name varchar(150) not null,
    last_name varchar(150) not null,
    "position" varchar(150),
    image varchar(100),
    bio text,
    created_at date not null,
    is_active boolean not null,
    is_staff boolean not null,
    is_admin boolean not null,
    is_superuser boolean not null,
    PRIMARY KEY (id)
);
CREATE UNIQUE INDEX main_useraccount_pkey ON main_useraccount (id);
CREATE UNIQUE INDEX main_useraccount_email_68fbb6e11cf0e24_uniq ON main_useraccount (email);
create TABLE main_useraccount_groups (
    id integer not null default nextval('main_useraccount_groups_id_seq'::regclass),
    useraccount_id integer not null,
    group_id integer not null,
    PRIMARY KEY (id),
    FOREIGN KEY (useraccount_id) REFERENCES main_useraccount (id),
    FOREIGN KEY (group_id) REFERENCES auth_group (id)
);
CREATE UNIQUE INDEX main_useraccount_groups_pkey ON main_useraccount_groups (id);
CREATE UNIQUE INDEX main_useraccount_groups_useraccount_id_group_id_key ON main_useraccount_groups (useraccount_id, group_id);
CREATE INDEX main_useraccount_groups_f705e196 ON main_useraccount_groups (useraccount_id);
CREATE INDEX main_useraccount_groups_0e939a4f ON main_useraccount_groups (group_id);
create TABLE main_useraccount_user_permissions (
    id integer not null default nextval('main_useraccount_user_permissions_id_seq'::regclass),
    useraccount_id integer not null,
    permission_id integer not null,
    PRIMARY KEY (id),
    FOREIGN KEY (useraccount_id) REFERENCES main_useraccount (id),
    FOREIGN KEY (permission_id) REFERENCES auth_permission (id)
);
CREATE UNIQUE INDEX main_useraccount_user_permissions_pkey ON main_useraccount_user_permissions (id);
CREATE UNIQUE INDEX main_useraccount_user_permissi_useraccount_id_permission_id_key ON main_useraccount_user_permissions (useraccount_id, permission_id);
CREATE INDEX main_useraccount_user_permissions_f705e196 ON main_useraccount_user_permissions (useraccount_id);
CREATE INDEX main_useraccount_user_permissions_8373b171 ON main_useraccount_user_permissions (permission_id);

使用class BlogPost(models.Model): title = models.CharField(max_length=150) slug = models.CharField(max_length=255, unique=True,null=True, blank=True) image = models.ImageField(upload_to='blog_post_images', null=True, blank=True) content = RedactorField(max_length=10000, verbose_name='Redactor', null=True, blank=True) open_graph_description = models.TextField(null=True, blank=True) created_at = models.CharField(blank=True, null=True, max_length=150) updated_at = models.CharField(blank=True, null=True, max_length=150) author = models.ForeignKey('UserAccount') categories = models.ManyToManyField('BlogPostCategory') published = models.BooleanField(default=False) curation_article = models.ForeignKey('CurationArticle', null=True, blank=True, on_delete=models.SET_NULL) 时的完整TraceBack：

migrate

为什么Traceback (most recent call last): File "manage.py", line 10, in <module> execute_from_command_line(sys.argv) File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 338, in execute_from_command_line utility.execute() File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 330, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 393, in run_from_argv self.execute(*args, **cmd_options) File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 444, in execute output = self.handle(*args, **options) File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/migrate.py", line 221, in handle executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial) File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/executor.py", line 110, in migrate self.apply_migration(states[migration], migration, fake=fake, fake_initial=fake_initial) File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/executor.py", line 148, in apply_migration state = migration.apply(state, schema_editor) File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/migration.py", line 115, in apply operation.database_forwards(self.app_label, schema_editor, old_state, project_state) File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/operations/fields.py", line 201, in database_forwards schema_editor.alter_field(from_model, from_field, to_field) File "/usr/local/lib/python2.7/dist-packages/django/db/backends/base/schema.py", line 456, in alter_field new_db_params = new_field.db_parameters(connection=self.connection) File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/related.py", line 2008, in db_parameters return {"type": self.db_type(connection), "check": []} File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/related.py", line 1999, in db_type rel_field = self.related_field File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/related.py", line 1902, in related_field return self.foreign_related_fields[0] File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/related.py", line 1636, in foreign_related_fields return tuple(rhs_field for lhs_field, rhs_field in self.related_fields) File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/related.py", line 1623, in related_fields self._related_fields = self.resolve_related_fields() File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/related.py", line 1616, in resolve_related_fields else self.rel.to._meta.get_field(to_field_name)) File "/usr/local/lib/python2.7/dist-packages/django/db/models/options.py", line 554, in get_field raise FieldDoesNotExist('%s has no field named %r' % (self.object_name, field_name)) django.core.exceptions.FieldDoesNotExist: CurationArticle has no field named <function SET_NULL at 0x7fc5ae8836e0> 要求models.SET_NULL中的字段？ 我很确定这是我自己的错。

4 个答案:

答案 0 :(得分：32)

在我的情况下，我删除了一个字段，但最初忘记更改unique_together Meta属性，将删除的字段留在那里。 Django显然抱怨并且我更改了unique_together，但迁移是在migrations.RemoveField之前migrations.AlterUniqueTogether发出的，我收到了此错误。

从以下位置更改迁移文件中的顺序后：

# -*- coding: utf-8 -*-
# Generated by Django 1.9.1 on 2016-11-04 15:00
from __future__ import unicode_literals

from django.db import migrations, models


class Migration(migrations.Migration):

    dependencies = [
        ('team', '0021_auto_20161102_1930'),
    ]

    operations = [
        migrations.RemoveField(
            model_name='csvideo',
            name='youtube',
        ),
        migrations.AlterUniqueTogether(
            name='csvideo',
            unique_together=set([('casestudy', 'platform', 'video_id')]),
        ),
    ]

为：

# -*- coding: utf-8 -*-
# Generated by Django 1.9.1 on 2016-11-04 15:00
from __future__ import unicode_literals

from django.db import migrations, models


class Migration(migrations.Migration):

    dependencies = [
        ('team', '0021_auto_20161102_1930'),
    ]

    operations = [
        migrations.AlterUniqueTogether(
            name='csvideo',
            unique_together=set([('casestudy', 'platform', 'video_id')]),
        ),
        migrations.RemoveField(
            model_name='csvideo',
            name='youtube',
        ),
    ]

......小美女迁移了。

希望它有助于某人

答案 1 :(得分：4)

我认为问题是数据库不再看到从blogpost表到curationarticle表存在的外键。但是，blogpost仍然有一个名为curation_article_id的列，它曾用于存储curationarticle表的ID。

现在，当您尝试运行迁移时，当Django加载有关blogpost表的信息时，它只会将curation_article_id视为IntegerField而不是ForeignKey。 Django仍允许您将on_delete附加到IntegerField，但该字段本身没有导致错误的SET_NULL方法。

修复方法是更正数据库错误。

然后希望您可以首先找出导致数据库异常的原因。

它也有可能与数据库无关，并且作为中间人的PyCharm已经混淆了自己。

解决方案可能是将数据库与PyCharm分离并重新连接。

答案 2 :(得分：4)

我遇到了完全相同的问题。这解决了我的问题：

如果您在模型定义中定义了on_delete='SET_NULL'，请替换为on_delete=models.SET_NULL。 然后，查找包含

的其他迁移 
field=models.ForeignKey( .... on_delete=b'SET_NULL' ....

并替换为

field=models.ForeignKey( .... on_delete=django.db.models.deletion.SET_NULL ....

另外，请勿忘记导入模块：import django.db.models.deletion

答案 3 :(得分：0)

此线程的将来读者的一些其他信息... @Rich Ross发布的解决方案（技巧）在Django 2.0.6中也适用于具有以下traceback @ migrations的情况：

File "...\django\db\migrations\executor.py", line 117, in migrate     
File "...\django\db\migrations\executor.py", line 147, in _migrate_all_forwards     
File "...\django\db\migrations\executor.py", line 244, in apply_migration     
File "...\django\db\migrations\migration.py", line 122, in apply
File "...\django\db\migrations\operations\models.py", line 525, in database_forwards     
File "...\django\db\backends\base\schema.py", line 358, in alter_unique_together 
File "...\django\db\backends\base\schema.py", line 381, in _delete_composed_index
File "...\django\db\backends\base\schema.py", line 381, in <listcomp>
File "...\django\db\models\options.py", line 568, in get_field
raise FieldDoesNotExist("%s has no field named '%s'" % (self.object_name, field_name))
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