Rails - 从控制台访问序列化数据 [英] Rails - Accessing serialized data from console

问题描述

由于某种原因，每当我从控制台访问序列化属性时，它会将其视为正常字符串。当不从控制台访问（例如从视图）时，序列化/反序列化工作正常。我有如下代码：

For some reason, whenever I access a serialized attribute from the console, it treats it as a normal string. The serialization/deserialization works fine when not accessed from the console (ex. from the view). I have the code as follows:

class Foo < ActiveRecord::Base
  belongs_to :user
  serialize :serialized_data    # column type is text
  ...
end

例如，如果我要在 app / views / users / show.html.erb 中插入以下内容：

For example, if I were to put in app/views/users/show.html.erb the following:

<%= @user.foo.serialized_data.first %>

它会正确地打印出第一组数据。当我从控制台运行以下命令时：

It would properly print out the first of the set of data. When I run the following command from console:

> User.first.foo.serialized_data.first

它只是打印出 ，这是YAML文件的第一个字符。此外， User.first.foo.serialized_data 将打印一个大字符串，而不是最初保存的数组/散列。

It would simply print out -, which is the first character of a YAML file. Further, User.first.foo.serialized_data would print out a large string rather than the array/hash that was originally saved.

UPDATE：

如果我在：serialized_data 中生成数据，并尝试在同一个控制台会话中访问它，它似乎工作得很好。一旦我关闭控制台，然后重新输入，就会出现问题。

UPDATE:
If I generate the data in :serialized_data and attempt to access it in the same console session, it seems to work fine. Once I close console and then re-enter it, the issue occurs.

编辑：

要澄清，：serialized_data 是以下形式的散列数组：

For clarification, :serialized_data is an array of hashes in the following form:

[{"stuff" => {"name" => name, "qty" => 1}}, {"stuff" => {"name" => name2, "qty" => 3}}]

，可以这样访问：

user.foo.serialized_data[0]["stuff"]["qty"]
=> 1

编辑2：

还有一点很重要，在我的哈希中存储模型对象。如下面的注释中提到的，如果我们使用我给的例子， user.foo.serialized_data [0] [stuff] [name] 具有属性的模型 Name 的对象。所以，我可以运行 user.foo.serialize_data [0] [stuff] [name]。id 等等。可能对象是乱七八糟的YAML文件的语法。

EDIT 2:
It may also be important to note that I am storing a model object in my hash. As mentioned in the comments below, if we were to use the example I gave, user.foo.serialized_data[0]["stuff"]["name"] would return an object of model Name with attributes. So, I could run user.foo.serialize_data[0]["stuff"]["name"].id and so on. Maybe the object is messing with the syntax of the YAML file.

推荐答案

问题是我存储一个整个对象在切换到对象 id ，修复了这个问题。

The problem was that I was storing an entire object in the hash value, as mentioned in EDIT 2. Switching it to the object id fixed this issue.

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