Python Django loaddata唯一约束失败
我正在使用空数据库运行Python Django loaddata唯一约束失败,python,json,unique,loaddata,Python,Json,Unique,Loaddata,我正在使用空数据库运行python manage.py loaddata'path/to/mydata.json'(User和UserProfile表已创建但未填充),但是,我遇到以下错误: django.db.utils.IntegrityError: Problem installing fixture 'path/to/mydata.json': Could not load myapp.UserProfile(pk=1): UNIQUE constraint failed: myapp_
python manage.py loaddata'path/to/mydata.json'
(User
和UserProfile
表已创建但未填充),但是,我遇到以下错误:
django.db.utils.IntegrityError: Problem installing fixture 'path/to/mydata.json': Could not load myapp.UserProfile(pk=1): UNIQUE constraint failed: myapp_userprofile.user_id
我检查了(即使在运行了这个命令之后)并且数据库根本没有被填充。那么,它怎么会给出一个pk不是唯一的错误呢
如果相关,UserProfile
只是按照建议使用OneToOneField
关系扩展默认的User
模型
以下是mydata.json
包含的内容:
[
{
"model": "auth.user",
"pk": 1,
"fields": {
"password": "pbkdf2_sha256..",
"last_login": "2016-10-22T15:19:46.926Z",
"is_superuser": true,
"username": "thesuperuser",
"first_name": "",
"last_name": "",
"email": "a@a.co",
"is_staff": true,
"is_active": true,
"date_joined": "2016-10-22T14:48:27.394Z",
"groups": [],
"user_permissions": []
}
},
{
"model": "auth.user",
"pk": 2,
"fields": {
"password": "pbkdf2_sha256..",
"last_login": null,
"is_superuser": false,
"username": "user1",
"first_name": "User",
"last_name": "One",
"email": "",
"is_staff": false,
"is_active": true,
"date_joined": "2016-10-22T15:20:32Z",
"groups": [],
"user_permissions": []
}
},
{
"model": "auth.user",
"pk": 4,
"fields": {
"password": "pbkdf2_sha256..",
"last_login": null,
"is_superuser": false,
"username": "user3",
"first_name": "User",
"last_name": "Three",
"email": "",
"is_staff": false,
"is_active": true,
"date_joined": "2016-10-22T15:21:09Z",
"groups": [],
"user_permissions": []
}
},
{
"model": "auth.user",
"pk": 3,
"fields": {
"password": "pbkdf2_sha256..",
"last_login": null,
"is_superuser": false,
"username": "user2",
"first_name": "User",
"last_name": "Two",
"email": "",
"is_staff": false,
"is_active": true,
"date_joined": "2016-10-22T15:21:03Z",
"groups": [],
"user_permissions": []
}
},
{
"model": "myapp.userprofile",
"pk": 1,
"fields": {
"user": 1,
"money": 100
}
},
{
"model": "myapp.userprofile",
"pk": 2,
"fields": {
"user": 2,
"money": 100
}
},
{
"model": "myapp.userprofile",
"pk": 3,
"fields": {
"user": 3,
"money": 100
}
},
{
"model": "myapp.userprofile",
"pk": 4,
"fields": {
"user": 4,
"money": 100
}
}
]
谢谢你的帮助,我也遇到了类似的问题。受此帖子启发: (请参阅“如何修复它”) 在运行loaddata命令之前,我在“saving function”之前对receiver signal decorator进行了注释,它成功了 今天(2020年4月24日)我在《Django 2.2》中遇到了类似的问题 我的fixtures文件如下所示:
[
{
"model": "contenttypes.contenttype",
"pk": 1,
"fields": {
"app_label": "admin",
"model": "logentry"
}
},
{
"model": "contenttypes.contenttype",
"pk": 2,
"fields": {
"app_label": "auth",
"model": "permission"
}
}]
当我运行/manage.py loaddata initial\u data.json
时,我得到:
django.db.utils.IntegrityError:安装夹具“/home/user/reponame/projectname/initial_data.json”时出现问题:无法加载ContentType.ContentType(pk=2):唯一约束失败:django_content_type.app_标签,django_content_type.model
我所做的只是将contenttypes.contenttype
模型的pk
重命名为id
。之后,迁移工作如预期的那样进行
./manage.py loaddata initial_data.json
Installed 2 object(s) from 1 fixture(s)
更改后,我的initial_data.json
文件是:
[
{
"model": "contenttypes.contenttype",
"id": 1,
"fields": {
"app_label": "admin",
"model": "logentry"
}
},
{
"model": "contenttypes.contenttype",
"id": 2,
"fields": {
"app_label": "auth",
"model": "permission"
}
}]
值得一提的是,我原来的initial_dataj.json有许多其他模型,但将pk重命名为id仅用于
contenttypes。contenttype
解决了我的问题。打开json文件,将每个“pk”更改为“id”
如果使用vs代码,只需选择1并按cmd/ctrl+f2作为快捷键在导出和导入具有多个关系的模型时遇到相同的问题。这是因为我在导出时手动指定了ManyToMany-through模型,导致了唯一的约束错误
class MyModel(model.Model):
groups = models.ManyToManyField(
'myapp.mymodel',
)
您只需要执行dumpdata myapp.mymodel
,而不需要执行“dumpdata myapp.mymodel myapp.mymodel\u组”
否则,贯穿模型数据将在导出中出现两次,并导致唯一约束错误
class MyModel(model.Model):
groups = models.ManyToManyField(
'myapp.mymodel',
)
这是一个很好的问题,当您指定一个显式的直通模型时,它的行为如何……我不知道,也没有时间测试:)在创建db转储时排除ContentType和Auth权限对象
python manage.py dumpdata --natural-foreign --natural-primary -e contenttypes -e auth.Permission --indent 2 > dump.json
之后,您应该能够运行命令而不会出现任何问题
python manage.py loaddata dump.json
归功于
为了保存我的一天我无法想象这样一种情况,即在加载db转储时,您希望这些保存后挂钩运行…对我不起作用,因为它会导致内容类型错误谢谢,这对我有效。我以前曾尝试将所有pk更改为id,但这会导致出现
django.contrib.contenttypes.models.DoesNotExist:ContentType mat查询不存在。KeyError:“内容类型”