Question

我有以下模型：

# coding:utf-8
from django.db import models
from django.utils.text import slugify
from django.utils.translation import ugettext_lazy as _

class MenuGroup(models.Model):
    name = models.CharField(_('nome'), max_length=30, blank=False, primary_key=True)
    slug = models.SlugField(_('slug'), blank=True, null=True, db_index=True)

    class Meta:
        app_label = 'dashboard'
        verbose_name = _('gruppo')
        verbose_name_plural = _('gruppi')
        ordering = ('name',)

    def __str__(self):
        return self.name

   def save(self, *args, **kwargs):
        if not self.slug:
            self.slug = slugify(self.name)
        super(MenuGroup, self).save(*args, **kwargs)


class MenuProduct(models.Model):
    name = models.CharField(max_length=30)
    ingredients = models.CharField(max_length=250)
    price = models.FloatField(null=True, blank=True, default=0.0)
    group = models.ForeignKey(MenuGroup, on_delete=models.CASCADE)

    class Meta:
        app_label = 'dashboard'
        verbose_name = _('prodotto')
        verbose_name_plural = _('prodotti')
        ordering = ('name',)

    def __str__(self):
        return self.name


class Order(models.Model):
    price = models.FloatField(null=True, blank=True, default=0.0)
    date = models.DateTimeField(auto_now=False)
    status = models.BooleanField(default=False)

    class Meta:
        app_label = 'dashboard'
        verbose_name = _('ordine')
        verbose_name_plural = _('ordini')
        ordering = ('date',)

    def __str__(self):
        return self.date


class OrderHasMenuProduct(models.Model):
    product = models.ForeignKey(MenuProduct, on_delete=models.CASCADE)
    order = models.ForeignKey(Order, on_delete=models.CASCADE)

假设我们要重置数据库，然后启动以下命令：

$ find . -path "*/migrations/*.py" -not -name "__init__.py" -delete
$ find . -path "*/migrations/*.pyc"  -delete

然后我们启动命令来重新创建模式：

$ python manage.py makemigrations

我获得以下输出： “仪表板”的迁移：

dashboard / migrations / 0001_initial.py -创建模型MenuGroup -创建模型MenuProduct -创建模型订单 -创建模型OrderHasMenuProduct

然后我启动：

$ python manage.py migrate

我获得以下输出：

正在运行的迁移：没有要申请的迁移。

使用用于数据库的Django API，我将一些记录插入MenuGroup表中，然后打开一个视图以显示所有记录。

我的观点：

from django.views.generic.list import ListView
class MenuView(ListView):
    model = MenuGroup
    context_object_name = "all_menu_groups"
    template_name = 'dashboard/menu.html'

    def get_context_data(self, **kwargs):
        context = super(MenuView, self).get_context_data(**kwargs)
        context['page_title'] = _('Menu')
        return context

当我尝试分页时，出现以下错误：

django.db.utils.ProgrammingError: relation "dashboard_menugroup" does not exist
LINE 1: SELECT (1) AS "a" FROM "dashboard_menugroup" WHERE "dashboar...
                           ^

Answer 1

仅删除迁移文件还不够。您还必须删除数据库。

编辑：实际上，您必须删除一些迁移表。您可以使用未记录的Django模型来这样做：MigrationRecorder.Migration.objects.all().delete()

对于这种情况，我有一个管理命令包，但尚未经过很好的测试以用于生产。

django.db.utils.ProgrammingError：关系“ dashboard_menugroup”不存在

1 个答案: