initial commit

utils/chen_pagination.py

@@ -0,0 +1,34 @@
+from django.db.models import QuerySet
+from ninja.pagination import PaginationBase
+from ninja.types import DictStrAny
+from ninja_schema import Schema
+from ninja import Field
+from typing import List,Any
+
+# 这个结构是前端要求的，看前端代码可知
+class Total(Schema):
+    total:int
+
+class MyPagination(PaginationBase):
+    class Input(Schema):
+        pageSize: int = Field(10, gt=0)
+        page: int = Field(1, gt=-1)
+
+    class Output(Schema):
+        items: List[Any]
+        pageInfo: Total
+
+    def paginate_queryset(
+            self,
+            queryset: QuerySet,
+            pagination: Input,
+            **params: DictStrAny,
+    ) -> Any:
+        offset = pagination.pageSize * (pagination.page - 1)
+        limit: int = pagination.pageSize
+        return {
+            "page": offset,
+            "limit": limit,
+            "items": queryset[offset: offset + limit],
+            "pageInfo": {'total':self._items_count(queryset)},
+        }  # noqa: E203