AttributeError: module 'student.models' has no attribute 'ManyToManyField'

Question

我正在使用以下型号：

models.py

class Student(models.Model):
    name    =   models.CharField(max_length = 200)
    country =   models.ManyToManyField(Country, null = True,blank=True)

class Country(models.Model):
    title   =   models.CharField(max_length = 100, null = True)
    
    def __str__(self):
        return self.title

admin.py

@admin.register(models.Student)
class StudentAdmin(admin.ModelAdmin):
    formfield_overrides = {
        models.ManyToManyField: {'widget': CheckboxSelectMultiple},
    }

我收到这个错误：

AttributeError: module 'student.models' has no attribute 'ManyToManyField'

Answer 1

您似乎在尝试使用 student.models 中的 models.ManyToManyField，而本应使用 django.db.models。

尝试将此导入添加到文件顶部：

from django.db import models

如果名称与您的 student.models 冲突，您可以将其重命名为：

from django.db import models as django_models

# then to use you would need to change your code to this:
django_models.ManyToManyField()

Answer 2

您导入了错误的 models 模块，而不是 ~~from student import models~~，您应该导入 from django.db import models.

另一个问题是你在定义Country 之前引用了一个。因此，您应该使用字符串文字来引用稍后定义的模型：

# no student.models
from django.db import <strong>models</strong>

class Student(models.Model):
    name = <strong>models</strong>.CharField(max_length=200)
    #               use a string literal ↓
    country = <strong>models</strong>.ManyToManyField(<strong>'Country'</strong>, null=True, blank=True)

class Country(<strong>models</strong>.Model):
    title = <strong>models</strong>.CharField(max_length=100, null=True)
    
    def __str__(self):
        return self.title

AttributeError: module 'student.models' has no attribute 'ManyToManyField'

AttributeError: module 'student.models' has no attribute 'ManyToManyField'

django

django-models

django-admin