will_paginate和mongodb的问题

Question

堆栈

1. ruby​​ =＆gt; 1.9.2头
2. rails =＆gt; 3.0.1
3. will_paginate =＆gt; （3.0.pre2）
4. mongo =＆gt; （1.1.5）
5. mongoid =＆gt; （2.0.0.beta.20）
6. mongoid_slug =＆gt; （0.4.6）

控制台

r = Radar.criteria
=> #<Mongoid::Criteria:0x00000104753d48 @selector={}, @options={}, @klass=Radar,     @documents=[]> 
r.map(&:title) 
=> ["1", "2", "3", "4", "5", "6"]

r.active.around(Radius.new,current_location).newest.map(&:title)
=> ["6", "5", "4", "3", "2", "1"] 

问题

第1步

r.active.around(Radius.new,current_location).newest.paginate(:page => 1, :per_page => 3).map(&:title)
=> ["3", "2", "1"] ] 

第2步

r.active.around(Radius.new,current_location).newest.paginate(:page => 2, :per_page => 3).map(&:title)
=>["3", "2", "1"]

在Step1中，分页应返回=＆gt; [“6”，“5”，“4]

当我更新到most_commented范围时，一切正常。

r.active.around(Radius.new,current_location).most_commented.map(&:title)
=> ["1", "2", "3", "4", "5", "6"]

r.active.around(Radius.new,current_location).most_commented.paginate(:page =>1 ,:per_page => 3).map(&:title)
=> ["1", "2", "3"]

r.active.around(Radius.new,current_location).most_commented.paginate(:page =>2 ,:per_page => 3).map(&:title)
=> ["4", "5", "6"]

conole中使用的范围

 scope :most_commented, :order_by => [:comment_count,:desc]
 scope :newest, :order_by => [:created_at,:desc]  

 def self.around(distance,location)
  radius = distance.to_rad
  near(:coords => location.coords + [radius])
 end

ps：我总是在每个例子中使用新的r = Radar.criteria我为了简化而从输出中删除了

Answer 1

我发现。附近的内容很好用于跳过

ruby​​-1.9.2-head＆gt; r = Radar.criteria

一切正常

ruby-1.9.2-head > r.active.near(:coords => ul.coords).newest.map(&:title)
=> ["6", "5", "4", "3", "2", "1"] 

相同的查询，但使用.skip

ruby-1.9.2-head > r.active.near(:coords => ul.coords).newest.skip(2).map(&:title)
=> [] 

使用.skip进行首次查询但不使用.near

ruby-1.9.2-head > r.active.newest.skip(2).map(&:title)
=> ["4", "3", "2", "1"]