英文:
Psych errors after Rails version update
问题
我们最近将一个客户的应用程序从Rails 4升级到Rails 5。然而，在运行测试套件后，尝试创建对象时出现了以下问题：
失败/错误：@ens_response = EnsResponse.create!(edi_request_body: @response.edi_request_body,edi_body: @response.edi_data,reject_reason: @response.attributes.try(:[], :reject_reason).try(:[], :text),response_attributes: @response.attributes)Psych::DisallowedClass:尝试加载未指定的类：Policy
其中Policy是我们app/models/文件夹中的一个模型。
我们尝试更改YAML文件的加载方式如下：
@service_hash ||= YAML.load_file(Rails.root.join('config', 'mcp_services.yml'),permitted_classes: [Policy],aliases: true)[Rails.env]
但没有成功。
我们还尝试更改application.rb文件，使用以下行：
config.active_record.yaml_column_permitted_classes = [Symbol,ActiveSupport::HashWithIndifferentAccess,ActionController::Parameters
但只是收到以下错误：
失败/错误：require File.expand_path("../../config/environment", __FILE__)NoMethodError:未定义方法 `yaml_column_permitted_classes=' for ActiveRecord::Base:Class
您有什么想法可能导致这个问题？本地的Psych版本为psych（默认：3.0.2），Rails版本为gem 'rails', '5.2.8'。
提前感谢！ 
英文:
We recently updated a client's application from Rails 4 to rails 5.
However, after running the test suite the following issue appeared whilst trying to create an object:
Failure/Error:@ens_response = EnsResponse.create!(edi_request_body: @response.edi_request_body,edi_body: @response.edi_data,reject_reason: @response.attributes.try(:[], :reject_reason).try(:[], :text),response_attributes: @response.attributes)Psych::DisallowedClass:Tried to load unspecified class: Policy
Where Policy is a model in our app/models/ folder.
We tried changing the loading of the YAML to the following:
@service_hash ||= YAML.load_file(Rails.root.join('config', 'mcp_services.yml'),permitted_classes: [Policy ],aliases: true)[Rails.env]
But it was to no avail.
We also tried changing the application.rb file to use the following line:
config.active_record.yaml_column_permitted_classes = [Symbol,ActiveSupport::HashWithIndifferentAccess,ActionController::Parameters
but just got the error:
Failure/Error: require File.expand_path("../../config/environment", __FILE__)NoMethodError:undefined method `yaml_column_permitted_classes=' for ActiveRecord::Base:Class
Any idea what might be causing this issue?
Local psych is at version psych (default: 3.0.2) and rails is on gem 'rails', '5.2.8'
Thanks in advance!
答案1
得分: 1
将以下部分翻译为中文：
"Quick unsafe hack is to set this in application.rb..."
"More involved is to add an initializer in config/initializers. The initializer tells rails what classes to allow when loading yaml."
"config/initializers/yaml_loader.rb"
"Psych::ClassLoader::ALLOWED_PSYCH_CLASSES = [Policy,
ActionController::Parameters,
ActiveSupport::HashWithIndifferentAccess,
ActiveSupport::TimeWithZone,
ActiveSupport::TimeZone,
DateTime,
]"
"module Psych
class ClassLoader
ALLOWED_PSYCH_CLASSES = [] unless defined? ALLOWED_PSYCH_CLASSES
class Restricted < ClassLoader
def initialize classes, symbols
@classes = classes + Psych::ClassLoader::ALLOWED_PSYCH_CLASSES.map(&:to_s)
@symbols = symbols
super()
end
end
end
end"
英文:
Quick unsafe hack is to set this in application.rb...
config.active_record.use_yaml_unsafe_load = true
More involved is to add an initializer in config/initializers. The initializer tells rails what classes to allow when loading yaml.
config/initializers/yaml_loader.rb
Psych::ClassLoader::ALLOWED_PSYCH_CLASSES = [Policy,ActionController::Parameters,ActiveSupport::HashWithIndifferentAccess,ActiveSupport::TimeWithZone,ActiveSupport::TimeZone,DateTime,]module Psychclass ClassLoaderALLOWED_PSYCH_CLASSES = [] unless defined? ALLOWED_PSYCH_CLASSESclass Restricted < ClassLoaderdef initialize classes, symbols@classes = classes + Psych::ClassLoader::ALLOWED_PSYCH_CLASSES.map(&:to_s)@symbols = symbolssuper()endendendend
答案2
得分: 0
经过更彻底的调查，发现错误是由于访问 `@response.attributes` 属性引起的，类似于这样：```ruby@ens_response = EnsResponse.create!(response_attributes: @response.attributes)
这是因为前述属性是一个包含多个对象的哈希（Hash），其中包括一个名为 policy: 的属性，该属性是来自相同模型类（Policy）的对象，因此 Psych 尝试加载未指定的类引起了错误。
修复方法是将该属性强制转换为 JSON 字符串（因为这是所需的模式行值类型）：
@ens_response = EnsResponse.create!(edi_request_body: @response.edi_request_body,edi_body: @response.edi_data,reject_reason: @response.attributes.try(:[], :reject_reason).try(:[], :text),response_attributes: @response.attributes.to_json)
故事的教训：在序列化之前使用调试器，如 Pry，检查所有项的属性。
<details><summary>英文:</summary>After more thorough investigation, it turns out that the error is being caused by accessing the `@response.attributes` property, something similar to this:```ruby@ens_response = EnsResponse.create!(response_attributes: @response.attributes)
It was due the fact that the aforementioned property is Hash, that contains several objects, including a property called policy: that is an object from the same model class (Policy), hence Psych trying to load an unspecified class caused an error.
The fix was to force-convert this property to a JSON string (since that's the schema row value type required):
@ens_response = EnsResponse.create!(edi_request_body: @response.edi_request_body,edi_body: @response.edi_data,reject_reason: @response.attributes.try(:[], :reject_reason).try(:[], :text),response_attributes: @response.attributes.to_json)
Moral of the story: Use debuggers such as Pry and check the properties of all items before serialization.
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