Traceback (most recent call last):
File "manage.py", line 23, in
main()
File "manage.py", line 19, in main
execute_from_command_line(sys.argv)
File "D:\codeProgram\python3.7\lib\site-packages\django\core\management__init__.py", line 381, in execute_from_command_line
utility.execute()
File "D:\codeProgram\python3.7\lib\site-packages\django\core\management__init__.py", line 357, in execute
django.setup()
File "D:\codeProgram\python3.7\lib\site-packages\django__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "D:\codeProgram\python3.7\lib\site-packages\django\apps\registry.py", line 114, in populate
app_config.import_models()
File "D:\codeProgram\python3.7\lib\site-packages\django\apps\config.py", line 211, in import_models
self.models_module = import_module(models_module_name)
File "D:\codeProgram\python3.7\lib\importlib__init__.py", line 127, in import_module
return bootstrap._gcd_import(name[level:], package, level)
File "", line 1006, in _gcd_import
File "", line 983, in _find_and_load
File "", line 967, in _find_and_load_unlocked
File "", line 677, in _load_unlocked
File "", line 728, in exec_module
File "", line 219, in _call_with_frames_removed
File "D:\codeStudy\django企业开发实战\typeidea\typeidea\blog\models.py", line 8, in
class Category(models.Model):
File "D:\codeStudy\django企业开发实战\typeidea\typeidea\blog\models.py", line 20, in Category
owner = models.ForeignKey(User, verbose_name="作者")
TypeError: __init_() missing 1 required positional argument: 'on_delete'
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.contrib.auth.models import User
from django.db import models
class Category(models.Model):
STATUS_NORMAL = 1
STATUS_DELETE = 0
STATUS_ITEMS = (
(STATUS_NORMAL, '正常'),
(STATUS_DELETE, '删除'),
)
name = models.CharField(max_length=50, verbose_name="名称")
status = models.PositiveIntegerField(
default=STATUS_NORMAL, choices=STATUS_ITEMS, verbose_name="状态")
is_nav = models.BooleanField(default=False, verbose_name="是否为导航")
owner = models.ForeignKey(User, verbose_name="作者")
created_time = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")
class Meta:
verbose_name = verbose_name_plural = '分类'
class Tag(models.Model):
STATUS_NORMAL = 1
STATUS_DELETE = 0
STATUS_ITEMS = (
(STATUS_NORMAL, '正常'),
(STATUS_DELETE, '删除'),
)
name = models.CharField(max_length=10, verbose_name="名称")
status = models.PositiveIntegerField(
default=STATUS_NORMAL, choices=STATUS_ITEMS, verbose_name="状态")
owner = models.ForeignKey(User, verbose_name="作者")
created_time = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")
class Meta:
verbose_name = verbose_name_plural = '标签'
class Post(models.Model):
STATUS_NORMAL = 1
STATUS_DELETE = 0
STATUS_DRAFT = 2
STATUS_ITEMS = (
(STATUS_NORMAL, '正常'),
(STATUS_DELETE, '删除'),
(STATUS_DRAFT, '草稿'),
)
title = models.CharField(max_length=255, verbose_name="标题")
desc = models.CharField(max_length=1024, blank=True, verbose_name="摘要")
content = models.TextField(verbose_name="正文", help_text="正文必须为MarkDown格式")
status = models.PositiveIntegerField(
default=STATUS_NORMAL, choices=STATUS_ITEMS, verbose_name="状态")
category = models.ForeignKey(Category, verbose_name="分类")
tag = models.ManyToManyField(Tag, verbose_name="标签")
owner = models.ForeignKey(User, verbose_name="作者")
created_time = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")
class Meta:
verbose_name = verbose_name_plural = "文章"
django新版本中，如果有外键关联，必须要指定 on_delete=，on_delete是当删除关联表中的数据时，当前表与其关联的行的行为
可设置的值有
on_delete=None, # 当删除关联表中的数据时，当前表与其关联的行的行为
- models.CASCADE，删除关联数据，与之关联也删除
- models.DO_NOTHING，删除关联数据，引发错误IntegrityError
- models.PROTECT，删除关联数据，引发错误ProtectedError
- models.SET_NULL，删除关联数据，与之关联的值设置为null（前提FK字段需要设置为可空）
- models.SET_DEFAULT，删除关联数据，与之关联的值设置为默认值（前提FK字段需要设置默认值）
- models.SET，删除关联数据，
a. 与之关联的值设置为指定值，设置：models.SET(值)
b. 与之关联的值设置为可执行对象的返回值，设置：models.SET(可执行对象)
https://blog.csdn.net/chtjava/article/details/82969853
owner = models.ForeignKey(User, verbose_name="作者")
TypeError: __init_() missing 1 required positional argument: 'on_delete'
先看报的错误，其他不用管，最后一行说明了问题，函数内部缺失了一个必要的参数'on_delete'，那把这个参数加上去就好了，
owner = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name="作者")
on_delete=models.CASCADE 意思是主表删除外键所在表也删除，看上面那楼解释就好了。
外键还可以加 related_name='owner_user',啥都行，规范我忘了，反正可以通过这个使用_set直接去查询，具体可以百度。
init方法使用与功能：
1.用来构造初始化函数,用来给类的实例进行初始化属性，所以可以不需要返回值
2.在创建类的实例时系统自动调用
3.自定义类如果不定义的话，默认调用父类object的，同理继承也是，子类若无，调 用父类，若有，调用自己的