无法导入名称“联系人”

Question

我正在尝试开发我的第一个 Django 应用程序，这是我的目录树：

demo-project
|____(html)
|____(myproject)
    |___db_dump.sql
    |___manage.py
    |___(myapp)
    |   |___(templates)
    |   |___ __init__.py
    |   |___ forms.py
    |   |___ models.py
    |   |___ tests.py
    |   |___ views.py
    |
    |___(myproject)
        |___ __init__.py
        |___ settings.py
        |___ urls.py
        |___ wsgi.py

这是我的models.py

from django.db import models
from django.forms import ModelForm
from myapp.forms import mwa_event_form


class mwa_user(models.Model):
    unique_id = models.IntegerField()
    email = models.CharField(max_length=75)
    firstName = models.CharField(max_length=40)
    lastName = models.CharField(max_length=40)
    gender = models.CharField(max_length=30)
    birthday = models.CharField(max_length=20)
    fbIdUser = models.CharField(max_length=20)
    os = models.CharField(max_length=30)


class Contact(models.Model):
    subject = models.CharField(max_length=100)
    message = models.CharField(max_length=100)
    sender = models.EmailField(max_length=100)


class mwa_event_model(ModelForm):
    class Meta:
        model = mwa_event_form
        fields = ['bfirstName', 'blastName']

和forms.py

from myapp.models import Contact
from django import forms


class ContactForm(forms.Form):
    subject = forms.CharField(max_length=100)
    message = forms.CharField(max_length=100)
    sender = forms.EmailField(max_length=100)


class mwa_user_form(forms.Form):
    unique_id = forms.IntegerField()
    email = forms.CharField(max_length=75)
    firstName = forms.CharField(max_length=40)
    lastName = forms.CharField(max_length=40)
    gender = forms.CharField(max_length=30)
    birthday = forms.CharField(max_length=20)
    fbIdUser = forms.CharField(max_length=20)
    os = forms.CharField(max_length=30)


class mwa_event_form(forms.Form):
    class Meta:
        model = Contact
        fields = ['bfirstName', 'blastName']

当我尝试发出命令 python manage.py runserver 时，我收到以下警告：

File "/var/lib/stickshift/51e9c62e500446b4bf0000e0/approot/data/563815/myproject/myapp/models.py", line 3, in <module>  
from myapp.forms import mwa_event_form 

File "/var/lib/stickshift/51e9c62e500446b4bf0000e0/approot/data/563815/myproject/myapp/forms.py", line 1, in <module>
from myapp.models import Contact

ImportError: cannot import name Contact

我错过了什么？我在类似的帖子中读到这可能与循环依赖有关，但查看 Django 文档我并没有真正理解这意味着什么。这与目录文件夹结构有关吗？

Answer 1

您应该将mwa_event_model 中的models.py 放入您的forms.py 文件中，因为它是一个表单。这将修复@Wooble 的答案中注意到的循环导入。

作为旁注，也许您应该阅读naming convention of classes 的python 样式指南“PEP8”。

编辑：我在最初的回答中不小心写了mwa_event_form。