[英]paginate related queryset in django
我有两个名为 Card 和 Comment 的模型,都与外键相关
class Card(models.Model):
image = models.CharField(max_length=100, default="")
email = models.EmailField(unique=True, max_length=30, null = False, blank=False, default="")
mobile = models.CharField(unique=True, max_length=12, null = False, blank=False, default="")
uploaded_time = models.DateTimeField(auto_now_add=True)
name = models.CharField(unique=True, max_length=30, null = False, blank=False, default="")
active = models.BooleanField(default=True)
def __str__(self):
return self.name
class Comment(models.Model):
image = models.ForeignKey(Card, on_delete=models.CASCADE, related_name="comments")
comment = models.CharField(max_length=100, blank=False, null=False)
valid = models.BooleanField(default=False)
我想使用 select_related 或 prefetch_related 查询访问卡片以及有限的(评论大小为 5)评论
我有一个用于评论的加载更多按钮,所以每当我按下加载更多时,我想要再获取 5 条评论
有人请回答,thnks :)
要对 Django 中的查询集进行分页,可以使用 Paginator class:
这将对查询集进行分页,允许您仅访问指定页面上的项目。
要对包含相关对象的查询集进行分页,您可以使用 select_related 方法预取相关对象。
这是一个例子:
# Assume that your queryset includes related objects, and that you want to prefetch them
my_queryset = Comment.objects.filter(image__id=your_id).values("comment")
# Create the paginator object as described above
paginator = Paginator(my_queryset, 5)
# Get the page number from the query string
page_number = request.GET.get('page')
# Get the page object for the specified page number
page_obj = paginator.get_page(page_number)
# Use the page object to access the items on the specified page
page_items = page_obj.object_list
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