# models

class Teacher(models.Model):

    name = models.CharField(max_length=32)

    salary = models.DecimalField(max_digits=5, decimal_places=2)

# objson

class TeacherJson(serializers.ModelSerializer):

    class Meta:

        model = models.Teacher

        fields = '__all__'

# urls

url(r'^teachers/', views.Teachers.as_view()),

# views

class Teachers(APIView):

    def post(self, request):

        list = []

        for i in range(1, 51):

            list.append(models.Teacher(name="%s老师" % i, salary=i))

        models.Teacher.objects.bulk_create(list)

        return Response({

            'status': 0,

            'msg': 'ok'

        })

from rest_framework.pagination import PageNumberPagination

class Teachers(APIView):

    permission_classes = []

    throttle_classes = []

    throttle_classes = []

    def get(self, request):

        # 没有分页的所有数据

        teacher_list = models.Teacher.objects.all()

        # 完成分页

        # 1) 初始化分页对象

        page_simple = PageNumberPagination()

        # 2) 配置分页对象

        # page_simple.page_size = api_settings.PAGE_SIZE

        # 一页显示的条数

        page_simple.page_size = 5

        # /teachers/?pages=3  默认page

        page_simple.page_query_param = 'pages'

        # /teachers/?pages=3&line=10 用户可以自定义访问一页有多少条数据

        page_simple.page_size_query_param = 'line'

        # 限制用户自定义一页最大能访问的条数

        page_simple.max_page_size = 10

        # 3) 操作分页后一页的数据

        teacher_page_list = page_simple.paginate_queryset(teacher_list, request, self)

        # 将一页的数据序列化后返回给前台

        teacher_data = objson.TeacherJson(teacher_page_list, many=True).data

        return Response({

            'status': 0,

            'msg': 'ok',

            'results': teacher_data

        })
        

from rest_framework.pagination import LimitOffsetPagination

class Teachers(APIView):

    def get(self, request):

        teacher_list = models.Teacher.objects.all()

        # 完成分页

        # 1) 初始化分页对象

        page_limit = LimitOffsetPagination()

        # 2) 配置分页对象

        # 一页显示的条数

        page_limit.default_limit = 5

        # 自定义一页获取的条数

        page_limit.limit_query_param = 'limit'

        # 从哪条数据开始查询

        page_limit.offset_query_param = 'offset'

        # 自定义最大获取一页的条数

        page_limit.max_limit = 8

        # 3) 操作分页数据

        teacher_page_list = page_limit.paginate_queryset(teacher_list, request, self)

        teacher_data = objson.TeacherJson(teacher_page_list, many=True).data

        return Response({

            'status': 0,

            'msg': 'ok',

            'previous': page_limit.get_previous_link(),  # 上一页

            'next': page_limit.get_next_link(),  # 下一页

            'results': teacher_data

        })

        # return page_limit.get_paginated_response(teacher_data)  # 内部提供的Response对象

from rest_framework.pagination import CursorPagination

class Teachers(APIView):

    def get(self, request):

        teacher_list = models.Teacher.objects.all()

        # 完成分页

        # 1) 初始化分页对象

        page_cursor = CursorPagination()

        # 2) 配置分页对象

        # 一页的条数

        page_cursor.page_size = 10

        # 排序的字段，可以正向也可以反向

        page_cursor.ordering = '-id'

        # 游标的关键字

        page_cursor.cursor_query_param = 'cursor'

        # 3) 操作分页数据

        teacher_page_list = page_cursor.paginate_queryset(teacher_list, request, self)

        teacher_data = objson.TeacherJson(teacher_page_list, many=True).data

        return Response({

            'status': 0,

            'msg': 'ok',

            'previous': page_cursor.get_previous_link(),  # 上一页

            'next': page_cursor.get_next_link(),  # 下一页

            'results': teacher_data

        })