mongoid .limit在mongoid 3.1.x中不起作用 [英] mongoid .limit does not work in mongoid 3.1.x
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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.
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