模型在同步时不创建表

Posted 2023-02-24

【中文标题】模型在同步时不创建表

【英文标题】：Models does not create tables when synched

【发布时间】：2011-03-08 15:11:13

【问题描述】：

我的扩展用户配置文件有一些 django 模型。问题是，当使用 syncdb 时，此代码不会创建表（根本没有任何反应。没有验证错误）。为什么会这样？ （这些模型也会在其他地方出现导入错误）：

#!/usr/bin/env python
# encoding: utf-8
from django.db import models
from django.contrib.auth.models import User
from registration.signals import user_registered
from forms import ExtendedRegistrationForm
import hashlib

class InheritedProfile(models.Model):
    first_name = models.CharField("Name", max_length=50, blank=True, null=True)
    last_name = models.CharField("Last name", max_length=50, blank=True, null=True)
    pid = models.CharField("PESEL", max_length=11, blank=True, null=True)
    street = models.CharField("Street", max_length=50, blank=True, null=True)
    number = models.CharField("Flat/house number", max_length=10, blank=True, null=True)
    code = models.CharField("Zip ", max_length=6, blank=True, null=True)
    city = models.CharField("City", max_length=50, blank=True, null=True) 
    class Meta:
        abstract=True

class UserProfile(InheritedProfile):
    def upload_path(self, field_attname):
        filename = hashlib.md5(field_attname).hexdigest()[:4] + "_" + field_attname
        return "uploads/users/%s" % (filename,)

    user = models.ForeignKey(User, unique=True, related_name='profile')
    image = models.ImageField(upload_to=upload_path, verbose_name="Image", blank=True, null=True)

    class Meta:
        ordering = ['-id']
        db_table = 'userprofile'

    def __unicode__(self):
        return u"%s " % self.user.username

def user_created(sender, user, request, **kwargs):
    form = ExtendedRegistrationForm(request.POST)
    extended_user = UserProfile(user=user)
    extended_user.is_active = False
    extended_user.first_name = form.cleaned_data['first_name']
    extended_user.last_name = form.cleaned_data['last_name']
    extended_user.pid = form.cleaned_data['pid']
    extended_user.image = form.cleaned_data['image']
    extended_user.street = form.cleaned_data['street']
    extended_user.number = form.cleaned_data['number']
    extended_user.code = form.cleaned_data['code']
    extended_user.city = form.cleaned_data['city']
    extended_user.save()

user_registered.connect(user_created)

class Friend(InheritedProfile):
    friend_of = models.ForeignKey(UserProfile, related_name='friend_of')
    class Meta:
        db_table = 'friend'

相反，这段代码完美地生成了表格：

#!/usr/bin/env python
# encoding: utf-8
from django.db import models
from django.contrib.auth.models import User
import hashlib

class InheritedProfile(models.Model):
    first_name = models.CharField("Name", max_length=50, blank=True, null=True)
    last_name = models.CharField("Last name", max_length=50, blank=True, null=True)
    pid = models.CharField("PESEL", max_length=11, blank=True, null=True)
    street = models.CharField("Street", max_length=50, blank=True, null=True)
    number = models.CharField("Flat/house number", max_length=10, blank=True, null=True)
    code = models.CharField("Zip ", max_length=6, blank=True, null=True)
    city = models.CharField("City", max_length=50, blank=True, null=True) 
    class Meta:
        abstract=True

class UserProfile(InheritedProfile):
    def upload_path(self, field_attname):
        filename = hashlib.md5(field_attname).hexdigest()[:4] + "_" + field_attname
        return "uploads/users/%s" % (filename,)

    user = models.ForeignKey(User, unique=True, related_name='profile')
    image = models.ImageField(upload_to=upload_path, verbose_name="Image", blank=True, null=True)

    class Meta:
        ordering = ['-id']
        db_table = 'userprofile'

    def __unicode__(self):
        return u"%s " % self.user.username

class Friend(InheritedProfile):
    friend_of = models.ForeignKey(UserProfile, related_name='friend_of')
    class Meta:
        db_table = 'friend'

我应该把这个 user_created 函数移到别的地方吗？信号不应在这里造成问题...

【问题讨论】：

是否有可能在forms 中导入models 或特定模型？

我正在导入特定模型。好吧，不知道为什么这个函数与为模型创建表相冲突，但我已经把它移到了另一个文件中。现在一切正常。

【参考方案1】：

好吧，您似乎有某种交叉导入；如果您将一些模型导入到forms 并从那里导入一些表单返回到models 这无法解决，因为在处理models 时需要导入forms，而forms 需要再次models ...这无法解决！

除此之外，我认为不需要在模型模块中导入表单是更好的设计，因为它们与视图更相关！

【讨论】：

循环导入解决得很好。可能不是模块内的属性查找。 ***.com/questions/3082015/…