Question

我是Django的新手。我按照this教程创建了一个带有MySQL数据库的Web界面。以下是我的型号代码：

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

# Create your models here.


class Strain(models.Model):
    """;
    Model representing strains.
    """
    strain_name = models.CharField(max_length=100, blank=False, null=True, default=None)
    data_of_generation = models.DateField(null=True, blank=True, default= None)

    submitter = models.ForeignKey(User,null=True, blank = False, on_delete= models.CASCADE, default= None)

    class Meta:
        ordering = ["strain_name"]

    def get_absolute_url(self):
        """
        Returns the url to access a particular author instance.
        """
        return reverse('strain-detail', args=[str(self.id)])

    def __str__(self):
        """
        String for representing the Model object.
        """
        return '{0}'.format(self.strain_name)


class Plasmid(models.Model):
    """;
    Model representing an Plasmid Database.
    """
    plasmid_name = models.CharField(max_length=35, blank=False)
    data_of_generation = models.DateField(null=True, blank=True, default= None)
    restriction_sites = models.CharField(max_length=100, blank=False, null=True)

    host_strain = models.ForeignKey(Strain, null=True, blank = True, on_delete= models.CASCADE, default= None)


    class Meta:
        ordering = ["plasmid_name"]

    def get_absolute_url(self):
        """
        Returns the url to access a particular author instance.
        """
        return reverse('plasmid-detail', args=[str(self.id)])

    def __str__(self):
        """
        String for representing the Model object.
        """
        return '{0}'.format(self.plasmid_name)

当我第一次编写代码时，我不小心写了“N / A＆＃39;对于变量host_strain的默认选项。当我尝试迁移更改时，出现此错误：ValueError: invalid literal for int() with base 10: 'N/A'

当我将默认选项更改为“无”时，错误仍然没有消失。我甚至尝试删除我的mysql数据库中的表，但我仍然得到相同的错误。谁知道为什么？

Answer 1

问题可能是django尝试使用'N/A'值应用最新（错误）迁移并且它会中断。我建议你做的是查看你的应用程序的migrations文件夹，并删除最新的（由于erorr而未应用）迁移或尝试自己编辑;它会包含＆＃39; N / A＆＃39;作为默认值，您应该更改为其他默认值。

int（）与base 10的文字无效：＆＃39; N / A＆＃39; Django的

1 个答案: