增加通用分页函数和对应的测试

utils/shortcuts.py

@@ -1,4 +1,7 @@
 # coding=utf-8
+from django.core.paginator import Paginator
+
+from rest_framework import pagination
 from rest_framework.response import Response
 
 
@@ -11,4 +14,48 @@ def serializer_invalid_response(serializer):
 
 
 def success_response(data):
-    return Response(data={"code": 0, "data": data})
+    return Response(data={"code": 0, "data": data})
+
+
+def paginate(request, query_set, object_serializer):
+    """
+    用于分页的函数
+    :param query_set 数据库查询结果
+    :param object_serializer: 序列化单个object的serializer
+    :return response
+    """
+    need_paginate = request.GET.get("paging", None)
+    # 如果请求的参数里面没有paging=true的话 就返回全部数据
+    if need_paginate != "true":
+        return success_response(data=object_serializer(query_set, many=True).data)
+
+    page_size = request.GET.get("page_size", None)
+    if not page_size:
+        return error_response(u"参数错误")
+
+    try:
+        page_size = int(page_size)
+    except Exception:
+        return error_response(u"参数错误")
+
+    paginator = Paginator(query_set, page_size)
+    page = request.GET.get("page", None)
+
+    try:
+        current_page = paginator.page(page)
+    except Exception:
+        return error_response(u"参数错误")
+
+    data = {"results": object_serializer(current_page, many=True).data, "previous_page": None, "next_page": None}
+
+    try:
+        data["previous_page"] = current_page.previous_page_number()
+    except Exception:
+        pass
+
+    try:
+        data["next_page"] = current_page.next_page_number()
+    except Exception:
+        pass
+
+    return success_response(data)