mongoid .limit在mongoid 3.1.x中不起作用

本文介绍了mongoid .limit在mongoid 3.1.x中不起作用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我在Mongoid 3.1.0和最新的3.1.3的rails中尝试了类似的方法. .limit不起作用.下方应返回1行，但返回全部(4)

i tried something like this in rails with mongoid 3.1.0 and lastest 3.1.3. .limit does not work. below it should return 1 row but it returns all (4)

代码:

@go = Gallery.limit(1) logger.info "count: #{@go.count}"

输出:

count: 4 MOPED: 54.234.11.193:10055 QUERY database=mongohqtestdatabase collection=galleries selector= {"$query"=>{}, "$orderby"=>{:_id=>1}} flags=[:slave_ok] limit=-1 skip=0 batch_size=nil fields=nil (276.2010

ms)

使用limit()哪个版本的Mongoid更好?

which version of mongoid is good with limit() ?

推荐答案

limit命令可以正常工作，但是由于某些原因，count会忽略该限制.如果将其强制转换为数组，则会看到该限制正在起作用.

The limit command works fine, but for some reason count ignores the limit. If you cast it to an array you'll see that the limit is working.

Array(Gallery.limit(1)).length # this gives 1

此外，如果您实际遍历对象，您会发现该限制是有效的.

Also, if you actually iterate through the objects you'll see that the limit is working.