from django.db import models # Create your models here. class Category(models.Model): caption = models.CharField(max_length=) class ArticleType(models.Model): caption = models.CharField(max_length=) class Article(models.Model): title = models.CharFie…

Python3:Django根据models生成数据库表时报 __init__() missing 1 required positional argument: 'on_delete' 一.分析 在django2.0后,定义外键和一对一关系的时候需要加on_delete选项,此参数为了避免两个表里的数据不一致问题,不然会报错:TypeError: __init__() missing 1 required positional argument: 'on_delete' 二.解决方案 在外键值…

解决办法: a=models.ForeignKey('BookInfo',on_delete=models.CASCADE,) 即在外键值的后面加上 on_delete=models.CASCADE 原因: 在django2.0后,定义外键和一对一关系的时候需要加on_delete选项,此参数为了避免两个表里的数据不一致问题,不然会报错:TypeError: __init__() missing 1 required positional argument: 'on_delete'举例说明:us…

报错信息: E:\Python\s6day103>python manage.py makemigrations Traceback (most recent call last): File "manage.py", line 15, in <module> execute_from_command_line(sys.argv) File "F:\Program Files (x86)\Python3.6\lib\site-packages\django\…

原因: 在django2.0后,定义外键和一对一关系的时候需要加on_delete选项,此参数为了避免两个表里的数据不一致问题,不然会报错:TypeError: __init__() missing 1 required positional argument: 'on_delete'举例说明:user=models.OneToOneField(User)owner=models.ForeignKey(UserProfile)需要改成:user=models.OneToOneField(User…

sgrade = models.ForeignKey("Grades",) 执行python manage.py makemigrations后出现TypeError: __init__() missing 1 required positional argument: 'on_delete'缺少一个参数  'on_delete'加上就好了sgrade = models.ForeignKey("Grades",on_delete=models.CASCADE,)…

原因 执行命令 python manage.py makemigrations 报错 TypeError: __init__() missing 1 required positional argument: 'on_delete' 定义外键报错 解决办法 字段名称 = models.ForeignKey('表名', on_delete=models.CASCADE) on_delete=models.CASCADE 在 django2.0之前有默认值,之后版本就需要显式指定…

问题:在执行python manage.py makemigrations learning_logs时,系统会报错,提示:TypeError: __init__() missing 1 required positional argument: 'on_delete' (ll_env) c:\WorkSpace\SimpleTest\learning_log>python manage.py makemigrations learning_logsTraceback (most recent…

在执行python manage.py makemigrations时报错: TypeError: __init__() missing 1 required positional argument: 'on_delete' 解决方法: 在连接外键时加上: on_delete=models.CASCADE…

原因: 在django2.0后,定义外键和一对一关系的时候需要加on_delete选项,此参数为了避免两个表里的数据不一致问题,不然会报错:TypeError: __init__() missing 1 required positional argument: 'on_delete'举例说明:user=models.OneToOneField(User)owner=models.ForeignKey(UserProfile)需要改成:user=models.OneToOneField(User…