Question

以下是型号：

from django.db import models

class Reporter(models.Model):
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=30)
    email = models.EmailField()

    def __str__(self):              # __unicode__ on Python 2
        return "%s %s" % (self.first_name, self.last_name)

class Article(models.Model):
    headline = models.CharField(max_length=100)
    pub_date = models.DateField()
    reporter = models.ForeignKey(Reporter, on_delete=models.CASCADE)

    def __str__(self):              # __unicode__ on Python 2
        return self.headline

    class Meta:
        ordering = ('headline',)

如何找到使用Django orm编写至少一篇文章的记者？

Answer 1

您可以使用isnull过滤记者：

Reporter.objects.filter(article__isnull=False).distinct()

我怎样才能找到使用django orm写过至少一篇文章的记者？

1 个答案: