Question

请帮助我。有一个带有循环导入的Django项目。项目的应用程序仅在一侧连接。但是有些函数使用没有参数的其他模型（用于模板），因此无法移动该函数。

我找到了两种解决方案：第一种方法是在函数内部导入模型。另一种将两个模型移动到一个文件中的方法。两种解决方案都可以正常工作，但是哪个更好？

class InitialArticle(models.Model):
 by = models.ForeignKey(get_user_model(), null=True, on_delete = models.SET_NULL)
 category = models.ForeignKey(ArticleCategory, null=True, on_delete=models.CASCADE)
 keywords = models.CharField(max_length = 110, unique = True)

def get_articles_of_initialarticle(self):
    from article.models import Article
    return Article.objects.filter(initial = self)

请帮助我找到更好的方法。也许还有其他解决方案？

Answer 1

您可以像这样在Article.initial中添加related_name：

namespace enum_assignment
{
   class Program
  {
    enum transportation
    { Car = 20,
      Cab = 10,
      Bus = 5,
      Bicycle = 3,
    };

    static void Main(string[] args)
    {
        Console.WriteLine("Welcome to Kelvin Transit Center");
        Console.WriteLine();

        Type enumType;
        enumType = typeof(transportation);

        Console.WriteLine("Available transit methods:{0}", Environment.NewLine);
        foreach (int value in Enum.GetValues(enumType))
        Console.WriteLine("{0}:{1} dollars", Enum.GetName(enumType, value), value);

        Console.WriteLine("Please enter your method of transporatation: Car,Bus,Cab,Bicycle");
        Console.ReadLine();


        transportation defaultMthd = transportation.Bicycle;
        foreach (int value in Enum.GetValues(enumType))

        switch(defaultMthd)
        {
            case transportation.Bicycle:
            Console.WriteLine("Thank you for choosing {0},it is {1} every hour.",enumType, value);
            break;

            case transportation.Bus:
            Console.WriteLine("Thank you for choosing {0},it is {1} every hour.",enumType, value);
            break;

            case transportation.Cab:
            Console.WriteLine("Thank you for choosing {0},it is {1} every hour.",enumType, value);
            break;

            case transportation.Car:
            Console.WriteLine("Thank you for choosing {0},it is {1} every hour.",enumType, value);
            break;
        }
    Console.WriteLine();
    Console.ReadKey();

    }
}

之后，您可以像这样使用它：

class Article(...):
    initial = models.ForeignKey(to='InitialArticle', related_name='articles')

也在模型中。ForeignKey可以使用字符串而不是像我写的那样导入模型

或者您可以在不添加related_name的情况下完成此操作。

默认的相关名称如下：article_set 如果您未设置related_name，则可以这样写：

initial_article = InitialArticle.objects.filter(...).first()
initial_article.articles.all()  # return all articles which have foreign key to this article

Django圆形进口解决方案

1 个答案: