valueError:带基10的int()的无效文本：'‘

Question

我用django-2编写了这个简单的模型，当我试图迁移时，我得到了

ValueError:带基10的int()文本无效：'‘

from django.db import models

class Teacher(models.Model):
    name = models.CharField(max_length=50)
    user = models.IntegerField(default='',blank=True)
    passcode = models.IntegerField(default='',blank=True)

    def __str__(self):
        return self.name


class Student(models.Model):
    name = models.CharField(max_length=50)
    user = models.IntegerField(default='', blank=True)
    passcode = models.IntegerField(default='', blank=True)
    teacher = models.ManyToManyField(Teacher)   

    def __str__(self):
        return self.name

class Lesson (models.Model):
    name = models.CharField(max_length=50)
    cource = models.IntegerField(default='', blank=True)
    teacher = models.ForeignKey("Teacher", on_delete=models.CASCADE)
    Student = models.ManyToManyField(Student)

    def __str__(self):
        return self.name

class Score(models.Model):
    score = models.FloatField(default='', blank=True)
    student = models.ForeignKey(Student, on_delete=models.CASCADE)
    lesson = models.ForeignKey(Lesson, on_delete=models.CASCADE)

Answer 1

IntegerField和FloatField的默认值不能是字符串。

default=''表示空字符串。

将IntegerField和FloatField的默认值更改为某些数字或设置null=True

示例：

# Means it can not be empty and if it received empty, put 0 instead.
score = models.FloatField(default=0, blank=True)

或

# Means it is okay to be empty.
score = models.FloatField(null=True, blank=True)

此外，您可能需要删除以前更改的迁移文件。