ActiveRecord.find（array_of_ids），preserving订单 [英] ActiveRecord.find(array_of_ids), preserving order

问题描述

当你这样做 Something.find（array_of_ids） Rails中，所得到的数组的顺序并不取决于对 array_of_ids 。

When you do Something.find(array_of_ids) in Rails, the order of the resulting array does not depend on the order of array_of_ids.

有没有办法做到查找和preserve的顺序？

Is there any way to do the find and preserve the order?

ATM我手动排序依据订单ID的记录，但那是一种跛脚。

ATM I manually sort the records based on order of IDs, but that is kind of lame.

UPD：是否有可能使用指定的顺序：为了参数和某种形式的SQL子句，那么怎么

UPD: if it's possible to specify the order using the :order param and some kind of SQL clause, then how?

推荐答案

答案是MySQL只

有MySQL中的函数调用 FIELD（）

There is a function in mysql called FIELD()

下面是如何，你可以在.find使用它（）：

Here is how you could use it in .find():

>> ids = [100, 1, 6]
=> [100, 1, 6]

>> WordDocument.find(ids).collect(&:id)
=> [1, 6, 100]

>> WordDocument.find(ids, :order => "field(id, #{ids.join(',')})")
=> [100, 1, 6]

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