在Rails和ActiveRecord中查询时忽略某些字段 [英] Ignoring certain field when querying in Rails and ActiveRecord

问题描述

我知道我可以指定某些字段来使用 pluck 查询数据库。

I know that I can specify certain fields to query the database with pluck.

ids = Item.where('due_at < ?', 2.days.from_now).pluck(:id)

但是我想知道，是否有一种方法可以指定某些字段，我想避免从数据库中查询。

However I would like to know, whether there is a way to specify certain fields I would like to avoid querying from the db. Some kind of anti-pluck?

  posts = Post.where(published: true).do_not_lookup(:enormous_field)

推荐答案

Model＃attribute_names 应该返回列/属性数组。您可以排除其中一些并传递给 pluck 或 select 方法。

Model#attribute_names should return array of columns/attributes. You can exclude some of them and pass to pluck or select methods.

类似这样的东西：

posts = Post.where(published: true).select(Post.attribute_names - ['enormous_field'])

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