将Django的Paginator类与MongoDB游标一起使用

Question

是否有一种扩展MongoDB游标对象的已知方法，使其与Django的django.core.paginator.Paginator类兼容？

或者，也许，扩展Django的类？

Answer 1

您的临时解决方案（https://gist.github.com/2351079）看起来不错 - 但不是迫使游标读取与list()所有结果，并与[bottom:top]分页，也许尝试光标使用.skip()和.limit()明确 - 它可能会提高性能。

Answer 2

我面临着同样的问题，并实施了我自己的Paginator类。下面的代码：

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 

的主要变化是：

• 每个页面应该得到光标的克隆，因为片每光标只工作一次
• 每个页面应该也可以直接将其转换为len（）工作的列表