停止ActiveRecord的节约了序列化列，即使没有改变 [英] Stop ActiveRecord saving a serialized column even if not changed

问题描述

这是非常相似的 Rails的部分更新的问题，哈希的，但这个问题并没有真正得到回答恕我直言。

This is very similar to Rails partial updates problem with hashes , but the question has not really been answered IMHO.

问题是这样的：我有一个序列化的列模型：

The problem is this: I have a model with a serialized column:

class Import < AR::Base
  serialize :data

在我的情况下，这些数据将，并应，而不是先保存/创建模型之后更改。所以我想禁用的AR始终保存序列化列的功能（通常是一个好主意，因为它无法检测这些变化）。我想禁用保存，因为数据可能相当大，模型会经常更新。

In my case, this data will, and should, not change after the first save/creation of the model. So I want to disable the feature of AR that always saves serialized columns (which is normally a good idea, as it can't detect those changes). I want to disable the saving because the data can be quite large, and the model will be updated frequently.

我已经尝试过的monkeypatching到ActiceRecord :: AttributeMethods ::肮脏的是这样的：

I've already tried monkeypatching into ActiceRecord::AttributeMethods::Dirty like this:

class Import
  def update(*)
    if partial_updates?
      super(changed | (attributes.keys & (self.class.serialized_attributes.keys - ["data"])))
    else
     super
   end
 end

但这似乎没有任何效果。任何人有更好的主意？

but this seems to have no effect. Anybody got a better idea ?

这是在Rails的3.0.12

This is under Rails 3.0.12

推荐答案

我最后怎么了做什么，即使它不是一个真正的答案，原来的问题，如下：

What I ended up doing, even though it's not really an answer to the original question, is the following:

class Import < AR::Base
  belongs_to :storage

class Storage < AR::Base
  serialize :data

...即。移动数据列进自己的模型，和准与原始模型。这其实是概念上有点清洁。

...i.e. moving the data column into a model of its own, and associate that with the original model. Which is actually conceptually somewhat cleaner.

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