为什么我在django中创建新模型类时出错？

Posted 2021-04-05

我已经阅读了类似的问题，但无法找到解决方案或结论。我在同一个应用程序中创建新模型类时遇到此错误，以及在新应用程序中创建新模型类。错误

django.db.utils.IntegrityError: UNIQUE constraint failed: auth_permission.content_type_id, auth_permission.codename

我的models.py

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

CHOICES = (('Earned Leave','Earned Leave'),('Casual Leave','Casual Leave'),('Sick Leave','Sick Leave'),('Paid Leave','Paid Leave'))
STATUS_CHOICES = (('0', 'Rejected'),('1', 'Accepted'),)
MANAGER_CHOICES = (('0001_manager', '0001_manager'),('0002_manager', '0002_manager'))

class Leave(models.Model):

    employee_ID = models.CharField(max_length = 20)
    name = models.CharField(max_length = 50)
    user = models.ForeignKey(User, on_delete = models.CASCADE, null =True)
    def __str__(self):
        return self.name


class B(models.Model):

    state = models.CharField(max_length=50)

答案

删除以前的所有迁移，然后再次迁移make-migrations。它会工作的。