[django]drf知识点梳理-分页

msyql分页 limit offset

https://www.cnblogs.com/iiiiiher/articles/8846194.html

django自己实现分页

https://www.cnblogs.com/iiiiiher/articles/9219935.html

def index(request):
    # 分页算法
    # 1  0-10
    # 2  10-20
    per_page = 10
    cur_page = int(request.GET.get("p"))
    start = (cur_page - 1) * per_page
    end = cur_page * per_page

    # 页码
    page_num = len(user_list) // per_page

    ##上一页下一页
    if cur_page > 1:
        prev_page = cur_page - 1
    else:
        prev_page = 1
    if cur_page < page_num:
        next_page = cur_page + 1
    else:
        next_page = page_num
    return render(request, 'app01/index.html',
                  {'user_list': user_list[start:end], 'page_num': range(1, page_num + 1), 'prev_page': prev_page,
                   'next_page': next_page})

django自带的Pagination

https://blog.csdn.net/Yort2016/article/details/73551274

def index(request):
    print(request.path)  # /app01/
    print(request.get_full_path())  # /app01/?name=maotai&age=22

    # for i in range(10):
    #     Article.objects.create(title='t%s' % i, content='content%s' % i)
    # print(Article.objects.all()[1:5].query.__str__())
    all_article = Article.objects.all()

    paginator = Paginator(all_article, 2)
    page = request.GET.get('page', '1')  # 默认让显示第一页
    page_obj = paginator.page(page)

    print(page_obj)
    return render(request, 'app01/index.html', {'page_obj': page_obj})

index.html

<div>
    {% for foo in page_obj %}
        <li>{{ foo }}</li>
    {% endfor %}

</div>
<div class="pagination">
            <span class="page-links">
                {% if page_obj.has_previous %}
                    <a href="{{ request.path }}?page={{ page_obj.previous_page_number }}">previous</a>
                {% endif %}
                <span class="page-current">
                    Page {{ page_obj.number }} of {{ page_obj.paginator.num_pages }}.
                </span>
                {% if page_obj.has_next %}
                    <a href="{{ request.path }}?page={{ page_obj.next_page_number }}">next</a>
                {% endif %}
            </span>
</div>

rest_framework的分页Pagination配置

配置分页-使用系统自带的分页类

全局配置: 给所有的model都分页

https://www.django-rest-framework.org/api-guide/pagination/

rest_framework里settings里教你怎么配

• settings里设置rest_framework模块的配置

- rest_framework的pagination.py

class PageNumberPagination(BasePagination):
    """
    A simple page number based style that supports page numbers as
    query parameters. For example:

    http://api.example.org/accounts/?page=4
    http://api.example.org/accounts/?page=4&page_size=100

class LimitOffsetPagination(BasePagination):
    """
    A limit/offset based style. For example:

    http://api.example.org/accounts/?limit=100
    http://api.example.org/accounts/?offset=400&limit=100
    ...

设置自己的settings.py

REST_FRAMEWORK = {
    'PAGE_SIZE': 1,
    'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination'
}

配置分页,使用自己的类

- utils.pagination.Pagination.py

from rest_framework.pagination import PageNumberPagination

class Pagination(PageNumberPagination):
    def get_page_size(self, request):
        try:
            print(request.query_params) # <QueryDict: {'page': ['1'], 'page_size': ['-10']}>
            page_size = int(request.query_params.get("page_size", -1))
            # 如果前端传来的page_size小于0, 则取settings.py的PAGE_SIZE的值
            if page_size < 0:
                return self.page_size # 这个是settings.py里的PAGE_SIZE的值
            # 如果前端传来的page_size大于0, 则用前端传来的
            return page_size
        except:
            pass
        return self.page_size

- settings.py里的配置

REST_FRAMEWORK = {
    'PAGE_SIZE': 1,
    # 'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination',
    'DEFAULT_PAGINATION_CLASS': 'utils.pagination.Pagination'
}

如果全局中某一个model不想分页咋办?

views.py里设置下

    pagination_class = None

仅仅想给Users模型分页

- settings.py里配置

REST_FRAMEWORK = {
    'PAGE_SIZE': 10,
    # 'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination'
}

- Users/views.py

from .pagination import Pagination

class UserViewset(viewsets.ReadOnlyModelViewSet):
    '''
    List:
        查询用户列表
    Retrieve:
        查询某用户详情
    '''
    queryset = user.objects.all()
    serializer_class = UserSerialiser
    pagination_class = Pagination

分页效果及 分页存在的问题