潭州课堂25班：Ph201805201 django 项目 第三十六课 后台文章管理（课堂笔记）

get 请求，

1，获取文章标签 ，

2，拿到前台传来的值，

3，根据前台传来的值在数据库中查询

4.，返回数据到前台，渲染，

分页算法 ：

在 utils 下创建  paginator_script.py

def get_paginator_data(paginator, current_page, around_count=3):
    """
    :param paginator: 分页对象
    :param current_page: 当前页数据
    :param around_count: 显示的页码数
    :return: 当前页码、总页数、左边是否有更多页标记、右边是否有更多标记
    左边页码范围、右边页码范围
    """
    current_page_num = current_page.number  # 获取当前页面所在的页码
    total_page_num = paginator.num_pages  # 获取总页数

    left_has_more_page = False  # 默认左边没有更多页
    right_has_more_page = False  # 默认右边没有更多页

    # 算出当前页面左边的页码
    left_start_index = current_page_num - around_count
    left_end_index = current_page_num
    if current_page_num <= around_count * 2 + 1:
        left_page_range = range(1, left_end_index)
    else:
        left_has_more_page = True
        left_page_range = range(left_start_index, left_end_index)

    right_start_index = current_page_num + 1
    right_end_index = current_page_num + around_count + 1
    if current_page_num >= total_page_num - around_count * 2:
        right_page_range = range(right_start_index, total_page_num + 1)
    else:
        right_has_more_page = True
        right_page_range = range(right_start_index, right_end_index)

    return {
        "current_page_num": current_page_num,
        "total_page_num": total_page_num,
        "left_has_more_page": left_has_more_page,
        "right_has_more_page": right_has_more_page,
        "left_pages": left_page_range,
        "right_pages": right_page_range,
    }