如何排除IDS从查询Rails的数组（使用ActiveRecord的）？

问题描述

我想执行一个ActiveRecord查询，返回除了那些有一定IDS记录的所有记录。我想排除的ID存储在数组中。所以：

I would like to perform an ActiveRecord query that returns all records except those records that have certain ids. The ids I would like excluded are stored in an array. So:

ids_to_exclude = [1,2,3]
array_without_excluded_ids = Item. ???

我不知道如何完成第二行。

I'm not sure how to complete the second line.

背景：我已经尝试过什么：的

我不知道背景是必要的，但我已经尝试过.find和。凡的各种组合。例如：

I'm not sure background is necessary, but I've already tried various combinations of .find and .where. For example:

array_without_excluded_ids = Item.find(:all, :conditions => { "id not IN (?)", ids_to_exclude })
array_without_excluded_ids = Item.where( "items.id not IN ?", ids_to_exclude)

这些失败。 This提示可能是在正确的轨道，但我还没有成功地适应它。任何帮助将大大AP preciated。

These fail. This tip might be on the right track, but I have not succeeded in adapting it. Any help would be greatly appreciated.

推荐答案

这应该工作：

ids_to_exclude = [1,2,3]
items_table = Arel::Table.new(:items)

array_without_excluded_ids = Item.where(items_table[:id].not_in ids_to_exclude)

和它是完全面向对象的无弦： - ）

And it's fully object-oriented with no strings :-)

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