Django获取数据的上一条prev_in_order()和下一条数据next_in_order()方法

目的

django-next-prev提供实用程序来获取有序的过滤查询集中的下一个或上一个项目。例如，您可以在帖子详细信息页面上显示指向下一个精选帖子的链接，或者显示所有已发布帖子的按时间顺序排列的下一个和上一个链接。

安装

从​​https://pypi.python.org/pypi/django-next-prev/​​下载源代码 并运行python setup.py install

或者

pip install django-next-prev

需要Django 1.8或更高版本。

from django.db import models

class Category(models.Model):
    title = models.CharField(max_length=100)

class Post(models.Model):
    title = models.CharField(max_length=100)
    category = models.ForeignKey(Category, on_delete=models.CASCADE)
    created = models.DateField()
    text = models.TextField()

    class Meta:
        ordering = ('created', 'title')      

from next_prev import next_in_order, prev_in_order
from .models import Post

# default ordering
first = Post.objects.first()
second = next_in_order(first)
prev_in_order(second) == first # True
last = prev_in_order(first, loop=True)

# custom ordering
qs = Post.objects.all().order_by('-created')
newest = qs.first()
second_newest = next_in_order(newest, qs=qs)
oldest = prev_in_order(newest, qs=qs, loop=True)