Django不加载灯具

Question

当我执行python loaddata lecteurs时，我没有错误和正常输出：Installed 2 object(s) from 2 fixture(s)。 问题是我输入Django的shell并尝试Lecteurs.objects.all()这会给我一个空数组。

这就是Lecteur（模特）的样子：

class Lecteur(User):
    bibliotheque = models.ManyToManyField('bibliotheque.Livre')
    localisation = models.ForeignKey(Localisation)

yaml文件名为lecteurs.yaml：

- model: lecteurs.lecteur
  pk: 1
  fields:
    username: Leila
    bibliotheque: [1, 2]
    localisation: 1
- model: lecteurs.lecteur
  pk: 2
  fields:
    username: Saumon
    bibliotheque: [2, 3]
    localisation: 1
- model: lecteurs.lecteur
  pk: 3
  fields:
    username: Giraffon
    bibliotheque: [1, 4]
    localisation: 1
- model: lecteurs.lecteur
  pk: 4
  fields:
    username: Fany
    bibliotheque: [2, 3]
    localisation: 2

其他灯具装载没有问题。 希望你能提供帮助，我已经足够明确了。

Answer 1

TL; DR

您的yaml可能被错误地创建或遗漏了其他User个详细信息。

解释

好的，我刚刚做了一个示例执行夹具并为我工作。

所以我最初做的是通过代码创建yaml的序列化，意思是：

跟随：

1.按如下方式创建样本模型：

from django.db import models
from django.contrib.auth.models import User

class Lecteur(User):
    bibliotheque = models.CharField(max_length=100)
    localisation = models.IntegerField()

2.在Django Shell中，我做了以下事情：

python manage.py shell
from tester.models import Lecteur  #tester is my app
Lecteur.objects.create(username="User1", bibliotheque="Hey", localisation=12).save()
Lecteur.objects.create(username="User2", bibliotheque="Hey", localisation=12).save()
Lecteur.objects.create(username="User3", bibliotheque="Hey", localisation=12).save()

3.然后通过yaml创建了serializer转储，并将其添加到文件try.yaml

from django.core import serializers
data = serializers.serialize("yaml", SomeModel.objects.all())
with open('try.yaml', 'w') as f:
    f.write(data)

然后是至关重要的部分，我的yaml看起来如何？

像这样：

- fields:
    bibliotheque: Hey
    groups: []
    localisation: 12
    user_permissions: []
  model: tester.lecteur
  pk: 1
- fields:
    bibliotheque: Hey
    groups: []
    localisation: 12
    user_permissions: []
  model: tester.lecteur
  pk: 2
- fields:
    bibliotheque: Hey
    groups: []
    localisation: 12
    user_permissions: []
  model: tester.lecteur
  pk: 3

虽然我得到了Installed 3 object(s) from 3 fixture(s)而Lecteur.objects.all()没有给出任何结果，但这有点混乱。

现在出现了重要的事情：

我注意到，由于存在User模型继承，yaml不完整，因为当获取数据时，django无法找到要填充的用户数据。

所以，我做了类似的事情来获取database：

的完整数据

python manage.py dumpdata --format "yaml" > try.yaml

当我通过将yaml加载为

来重新创建数据库时

python manage.py loaddata try.yaml

我将数据恢复到数据库中。这是因为User表数据存在于yaml中，因此django现在可以正确填充数据库。

这是我的try.yaml文件：

- fields: {app_label: contenttypes, model: contenttype, name: content type}
  model: contenttypes.contenttype
  pk: 4
- fields: {app_label: auth, model: group, name: group}
  model: contenttypes.contenttype
  pk: 2
- fields: {app_label: tester, model: lecteur, name: lecteur}
  model: contenttypes.contenttype
  pk: 7
- fields: {app_label: auth, model: permission, name: permission}
  model: contenttypes.contenttype
  pk: 1
- fields: {app_label: sessions, model: session, name: session}
  model: contenttypes.contenttype
  pk: 5
- fields: {app_label: sites, model: site, name: site}
  model: contenttypes.contenttype
  pk: 6
- fields: {app_label: auth, model: user, name: user}
  model: contenttypes.contenttype
  pk: 3
- fields: {domain: example.com, name: example.com}
  model: sites.site
  pk: 1
- fields: {codename: add_group, content_type: 2, name: Can add group}
  model: auth.permission
  pk: 4
- fields: {codename: change_group, content_type: 2, name: Can change group}
  model: auth.permission
  pk: 5
- fields: {codename: delete_group, content_type: 2, name: Can delete group}
  model: auth.permission
  pk: 6
- fields: {codename: add_permission, content_type: 1, name: Can add permission}
  model: auth.permission
  pk: 1
- fields: {codename: change_permission, content_type: 1, name: Can change permission}
  model: auth.permission
  pk: 2
- fields: {codename: delete_permission, content_type: 1, name: Can delete permission}
  model: auth.permission
  pk: 3
- fields: {codename: add_user, content_type: 3, name: Can add user}
  model: auth.permission
  pk: 7
- fields: {codename: change_user, content_type: 3, name: Can change user}
  model: auth.permission
  pk: 8
- fields: {codename: delete_user, content_type: 3, name: Can delete user}
  model: auth.permission
  pk: 9
- fields: {codename: add_contenttype, content_type: 4, name: Can add content type}
  model: auth.permission
  pk: 10
- fields: {codename: change_contenttype, content_type: 4, name: Can change content
      type}
  model: auth.permission
  pk: 11
- fields: {codename: delete_contenttype, content_type: 4, name: Can delete content
      type}
  model: auth.permission
  pk: 12
- fields: {codename: add_session, content_type: 5, name: Can add session}
  model: auth.permission
  pk: 13
- fields: {codename: change_session, content_type: 5, name: Can change session}
  model: auth.permission
  pk: 14
- fields: {codename: delete_session, content_type: 5, name: Can delete session}
  model: auth.permission
  pk: 15
- fields: {codename: add_site, content_type: 6, name: Can add site}
  model: auth.permission
  pk: 16
- fields: {codename: change_site, content_type: 6, name: Can change site}
  model: auth.permission
  pk: 17
- fields: {codename: delete_site, content_type: 6, name: Can delete site}
  model: auth.permission
  pk: 18
- fields: {codename: add_lecteur, content_type: 7, name: Can add lecteur}
  model: auth.permission
  pk: 19
- fields: {codename: change_lecteur, content_type: 7, name: Can change lecteur}
  model: auth.permission
  pk: 20
- fields: {codename: delete_lecteur, content_type: 7, name: Can delete lecteur}
  model: auth.permission
  pk: 21
- fields:
    date_joined: 2014-10-25 07:41:32.935000+00:00
    email: ''
    first_name: ''
    groups: []
    is_active: true
    is_staff: false
    is_superuser: false
    last_login: 2014-10-25 07:41:32.935000+00:00
    last_name: ''
    password: ''
    user_permissions: []
    username: User1
  model: auth.user
  pk: 1
- fields:
    date_joined: 2014-10-25 07:41:41.199000+00:00
    email: ''
    first_name: ''
    groups: []
    is_active: true
    is_staff: false
    is_superuser: false
    last_login: 2014-10-25 07:41:41.199000+00:00
    last_name: ''
    password: ''
    user_permissions: []
    username: User2
  model: auth.user
  pk: 2
- fields:
    date_joined: 2014-10-25 07:41:48.713000+00:00
    email: ''
    first_name: ''
    groups: []
    is_active: true
    is_staff: false
    is_superuser: false
    last_login: 2014-10-25 07:41:48.713000+00:00
    last_name: ''
    password: ''
    user_permissions: []
    username: User3
  model: auth.user
  pk: 3
- fields:
    bibliotheque: Hey
    groups: []
    localisation: 12
    user_permissions: []
  model: tester.lecteur
  pk: 1
- fields:
    bibliotheque: Hey
    groups: []
    localisation: 12
    user_permissions: []
  model: tester.lecteur
  pk: 2
- fields:
    bibliotheque: Hey
    groups: []
    localisation: 12
    user_permissions: []
  model: tester.lecteur
  pk: 3

理想情况下，django应该抱怨，但那可能是一个bug。不确定实施。

特别注意以下yaml代码：

- fields:
    date_joined: 2014-10-25 07:41:32.935000+00:00
    email: ''
    first_name: ''
    groups: []
    is_active: true
    is_staff: false
    is_superuser: false
    last_login: 2014-10-25 07:41:32.935000+00:00
    last_name: ''
    password: ''
    user_permissions: []
    username: User1
  model: auth.user
  pk: 1

该代码是一个标识用户在创建自定义类之前必须添加的部分。