基类设定
响应列表对象的基类（utils/serializers.py）
分页元数据
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class MetaSerializer(object):
""" 分页元数据 """
def __init__(self, page, page_count, total_count, **kwargs):
"""
:param page: 当前第几页
:param page_count: 总页数
:param total_count: 总记录数
"""
self.page = page
self.page_count = page_count
self.total_count = total_count
def to_dict(self):
return {
'total_count': self.total_count,
'page_count': self.page_count,
'current_page': self.page,
}
分页封装（使用时需要重写get_obj方法）
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class BaseListPageSerializer(object):
""" 分页类封装"""
def __init__(self, page_obj, paginator=None, object_list=[]):
"""
:param page_obj: 当前页的对象
:param paginator: 分页器的对象
:param object_list: 当前页的数据列表
"""
self.page_obj = page_obj
self.paginator = paginator if paginator else page_obj.paginator
self.object_list = object_list if object_list else page_obj.object_list
def get_obj(self, obj): # 钩子函数
""" 对象的内容，子类重写 """
return {}
def to_dict(self):
page = self.page_obj.number
page_count = self.paginator.num_pages
total_count = self.paginator.count
meta = MetaSerializer(page=page, page_count=page_count, total_count=total_count).to_dict()
objects = []
for obj in self.object_list:
objects.append(self.get_obj(obj))
return {
'meta': meta,
'objects': objects,
}
响应错误的基类（utils/response.py）
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from django.http import JsonResponse
class NotFoundJsonResponse(JsonResponse):
""" 400 对应Json响应"""
status_code = 400
def __init__(self, *args, **kwargs):
data = {
"error_code": "4040000",
"error_msg": "您访问的内容不存在或已被删除",
}
super().__init__(data, *args, **kwargs)
应用
景点列表的对象（sight/serializers.py）
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from utils import serializers
class SightListSerializer(serializers.BaseListPageSerializer):
""" 景点列表的对象 """
def get_obj(self, obj): # 重写以返回自定义的字段
return {
'id': obj.id,
'name': obj.name,
'main_img': obj.main_img.url,
'score': obj.score,
'province': obj.province,
'min_price': obj.min_price,
'city': obj.city,
# TODO
'comment_count': 0
}
修改返回方法（sight/views.py）
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from sight import serializers
from utils.response import NotFoundJsonResponse
def render_to_response(self, context, **response_kwargs):
page_obj = context['page_obj'] # 打断点+调试模式可以知道这里面包含什么数据
if page_obj is not None:
data = serializers.SightListSerializer(page_obj).to_dict()
return http.JsonResponse(data)
else:
return NotFoundJsonResponse()