Question

我想返回章节的 str 方法，章节的标题和书的标题（来自书籍模型）。我需要它以便在管理页面上更好地显示。怎么做？

我应该在Book中创建一些新方法还是使用Model实例引用https://docs.djangoproject.com/en/1.11/ref/models/instances/#model-instance-methods？或者我应该使用过滤器检索特定对象？ https://docs.djangoproject.com/en/1.11/topics/db/queries/#retrieving-objects

我是django的新手，请提前感谢您的解决方案。

class Book(models.Model):
    author = models.CharField(max_length=200)
    title = models.TextField()
    created_date = models.DateTimeField(
            default=timezone.now)

    def __str__(self):
        return self.title+" ("+self.author+")"

    def book_author(self):
        return self.author

class Chapter(models.Model):
    book = models.ForeignKey(Book, on_delete=models.CASCADE)
    title = models.TextField()
    created_date = models.DateTimeField(
            default=timezone.now)
    body = models.TextField()
    hierarchy = models.IntegerField()
    sort = models.IntegerField(unique=True)

    def __str__(self):
        print(repr(Book))
        print(repr(Book.author))
#       print(repr(Book.objects.all().filter(id==1)))
#        print(repr(Book.objects.get(id=1)))
        print(repr(Book.book_author(self)))
        return self.title+"(book: "+")"

Answer 1

def __str__(self):
    return '%s (%s)' % (self.title, self.book.title,)

Answer 2

要更好地在管理面板中打印对象数据，您应该为模型覆盖__str__方法。

例如，您的代码应如下所示：

class Book(models.Model):
    author = models.CharField(max_length=200)
    title = models.TextField()
    created_date = models.DateTimeField(
            default=timezone.now)

    def __str__(self):
        return 'Book with title: {} writen by {}'.format(self.title, self.author)

`

引用model.py // Django中的另一个字段

2 个答案: