Rails update_attributes 方法是更新数据库模型的最佳选择吗? [英] Is the Rails update_attributes method the best choice for doing an update of a model in the database?

问题描述

def 更新@album = Album.find(params[:id])如果@album.update_attributes(params[:album])redirect_to(:action=>'list')别的渲染(:动作=>'编辑')结尾结尾

我正在介绍的 Rails 1.1.6 教程建议使用 update_attributes 方法来更新模型，就像上面列出的控制器中的示例代码一样.查看 Rails 文档，我想知道为什么不首选 update 方法，特别是因为它的命名如此合乎逻辑.

解决方案

Update 接受一个对象 id 参数和一组属性，这些属性的工作方式类似于 update_attributes.

所以这个(来自 AWDWR 第三版)

Order.update(12, :name => "Barney", :email => "[e-mail]")

相当于

Order.find(12).update_attributes(:name => "Barney", :email => "[e-mail]")

因此，如果您只想用一组属性更新一行已知 id，那么我会说没有理由不使用 update - 看起来这就是他们写的原因它！

(有什么办法可以让你的教程从 1.1.6 升级?它已经很老了，并且在它最新时并不是一个特别惊天动地的版本.1.2.6 更好 - 1.1.6 中的最后一个.xs，如果我没记错的话).

def update
  @album = Album.find(params[:id])
  if @album.update_attributes(params[:album])
    redirect_to(:action=>'list')
  else
    render(:action=>'edit')
  end    
end

A Rails 1.1.6 tutorial that I'm covering recommends using the update_attributes method for updating a model, as in the example code from my controller listed above. Looking at the Rails documentation I'm wondering why the update method would not have been preferred, especially since it is named so logically.

解决方案

Update takes an object id parameter and a set of attributes that otherwise work like update_attributes.

So this (from AWDWR 3rd edition)

Order.update(12, :name => "Barney", :email => "[e-mail]")

is equivalent to

Order.find(12).update_attributes(:name => "Barney", :email => "[e-mail]")

So if all you want to do is update a row of known id with a set of attributes then I'd say there's no reason not to use update - it looks like that's the reason they wrote it!

(Is there any way you can get your tutorial to upgrade from 1.1.6? It's pretty old and wasn't a particularly earth-shattering release when it was current. 1.2.6 was better - the last of the 1.xs, if I remember correctly).

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