Question

我正在尝试为每个作者提取最新的3本书，使用DateField作为日期。有任何想法如何使用Django ORM或原始SQL？

class Author(models.Model):                                                                                                                                                                                                                                                              
    name = models.CharField('Name', max_length=100)                                                                                                
    slug = models.SlugField('Slug', max_length=100, unique=True)                                                                                      

class Book(models.Model):                                                                                                                                                                                                                                                               
    author = models.ForeignKey(Author, verbose_name='Author')                                                                       
    published = models.DateField('Published on', db_index=True)

Answer 1

您可以遍历所有作者，为每个作者选择3本最新书籍并将其添加到全局列表中：

books = []
for x in Author.objects.all():
   bookslist = Book.objects.filter(author=x).order_by('-published')[:3]
   for book in bookslist:
      books.append(book)

通过外键获取最新的N项

1 个答案: