Question

我正在尝试编写一个脚本，该脚本将从json文件填充数据库。看起来像这样：

class Command(BaseCommand):
    def handle(self, *args, **options):
        categories = load_from_json('categories')

        ProductCategory.objects.all().delete()
        for category in categories:
            new_category = ProductCategory(**category)
            new_category.save()

        restaurants = load_from_json('restaurants')

        Restaurant.objects.all().delete()
        for restaurant in restaurants:
            category_name = restaurant['category']
            _category = ProductCategory.objects.get(name=category_name)
            restaurant['category'] = _category
            new_restaurant = Restaurant(**restaurant)
            new_restaurant.save()

当我运行它时，django会引发一个错误：禁止直接分配给多对多集的正向。请改用category.set（）。我的模型如下：

class ProductCategory(models.Model):
    name = models.CharField(verbose_name='наименование категории', max_length=64, unique=True)
    image = models.ImageField(upload_to='category_images', blank=True)
    description = models.TextField(verbose_name='описание категории', blank=True)

    def __str__(self):
        return self.name


class Restaurant(models.Model):
    name = models.CharField(verbose_name='наименование ресторана', max_length=64, unique=True)
    description = models.TextField(verbose_name='описание категории', blank=True)
    image = models.ImageField(upload_to='restaurant_images', blank=True)
    category = models.ManyToManyField(ProductCategory)

    def __str__(self):
        return self.name

看起来很多人都遇到了这个问题，但是我很难找到解决方法。

禁止直接分配给多对多集的正面

0 个答案: