將Django的Paginator類與MongoDB遊標一起使用

Question

是否有一種擴展MongoDB遊標對象的已知方法，使其與Django的django.core.paginator.Paginator類兼容？

或者，也許，擴展Django的類？

Answer 1

您的臨時解決方案（https://gist.github.com/2351079）看起來不錯 - 但不是迫使遊標讀取與list()所有結果，並與[bottom:top]分頁，也許嘗試光標使用.skip()和.limit()明確 - 它可能會提高性能。

Answer 2

我面臨着同樣的問題，並實施了我自己的Paginator類。下面的代碼：

from django.core.paginator import Paginator, Page 

class MongoPaginator(Paginator): 
    """ 
    Custom subclass of Django's Paginator to work with Mongo cursors. 
    """ 
    def _get_page(self, *args, **kwargs): 
     """ 
     Returns an instance of a single page. Replaced with our custom 
     MongoPage class. 
     """ 
     return MongoPage(*args, **kwargs) 

    def page(self, number): 
     """ 
     Returns a Page object for the given 1-based page number. 
     Important difference to standard Paginator: Creates a clone of the 
     cursor so we can get multiple slices. 
     """ 
     number = self.validate_number(number) 
     bottom = (number - 1) * self.per_page 
     top = bottom + self.per_page 
     if top + self.orphans >= self.count: 
      top = self.count 
     return self._get_page(
      self.object_list.clone()[bottom:top], number, self 
     ) 

class MongoPage(Page): 
    """ 
    Custom Page class for our MongoPaginator. Just makes sure the cursor is 
    directly converted to list so that we can use len(object_list). 
    """ 
    def __init__(self, object_list, number, paginator): 
     self.object_list = list(object_list) 
     self.number = number 
     self.paginator = paginator 

的主要變化是：

• 每個頁面應該得到光標的克隆，因爲片每光標只工作一次
• 每個頁面應該也可以直接將其轉換爲len（）工作的列表