猴子修补 ActiveResource::Errors [英] Monkey patching ActiveResource::Errors

问题描述

我遇到了一个关于 ActiveResource 的问题，该问题已经解决并且正在尝试没有太多运气就将其修补到我的应用程序中.

I've come across an issue with ActiveResource that has been resolved and was trying to monkey patch it into my application without much luck.

我在 config/initializers/中添加了一个包含以下内容的文件:

I've added a file in config/initializers/ containing the following:

class ActiveResource::Errors < ActiveModel::Errors
    # https://github.com/rails/rails/commit/b09b2a8401c18d1efff21b3919ac280470a6eb8b
    def from_hash(messages, save_cache = false)
      clear unless save_cache

      messages.each do |(key,errors)|
        errors.each do |error|
          if @base.attributes.keys.include?(key)
            add key, error
          elsif key == 'base'
            self[:base] << error
          else
            # reporting an error on an attribute not in attributes
            # format and add themActive  to base
            self[:base] << "#{key.humanize} #{error}"
          end
        end
      end
    end

    # Grabs errors from a json response.
    def from_json(json, save_cache = false)
      decoded = ActiveSupport::JSON.decode(json) || {} rescue {}
      if decoded.kind_of?(Hash) && (decoded.has_key?('errors') || decoded.empty?)
        errors = decoded['errors'] || {}
        if errors.kind_of?(Array)
          # 3.2.1-style with array of strings
          ActiveSupport::Deprecation.warn('Returning errors as an array of strings is deprecated.')
          from_array errors, save_cache
        else
          # 3.2.2+ style
          from_hash errors, save_cache
        end
      else
        # <3.2-style respond_with - lacks 'errors' key
        ActiveSupport::Deprecation.warn('Returning errors as a hash without a root "errors" key is deprecated.')
        from_hash decoded, save_cache
      end
    end
end

但它似乎仍在调用 activeresource-3.2.2/lib/active_resource/validations.rb:31:in 'from_json'.任何关于如何正确地修补这个补丁的帮助将不胜感激.

But it seems still to be calling activeresource-3.2.2/lib/active_resource/validations.rb:31:in 'from_json'. Any help on how properly to monkey patch this would be very much appreciated.

谢谢！

推荐答案

事实证明，问题是在我的文件在配置中加载后，Rails 延迟加载 ActiveResource，用原始定义覆盖它.修复只是在定义修补代码之前需要所需的文件.

It turns out that the problem was Rails lazy loading ActiveResource after my file was loaded in the config, overriding it with the original definitions. The fix is simply requiring the needed files before defining the patched code.

我修改后的代码:

require 'active_resource/base'
require 'active_resource/validations'

module ActiveResource
  class Errors
    # https://github.com/rails/rails/commit/b09b2a8401c18d1efff21b3919ac280470a6eb8b

    def from_hash(messages, save_cache = false)
      clear unless save_cache

      messages.each do |(key,errors)|
        errors.each do |error|
          if @base.attributes.keys.include?(key)
            add key, error
          elsif key == 'base'
            self[:base] << error
          else
            # reporting an error on an attribute not in attributes
            # format and add themActive  to base
            self[:base] << "#{key.humanize} #{error}"
          end
        end
      end
    end

    # Grabs errors from a json response.
    def from_json(json, save_cache = false)
      decoded = ActiveSupport::JSON.decode(json) || {} rescue {}
      if decoded.kind_of?(Hash) && (decoded.has_key?('errors') || decoded.empty?)
        errors = decoded['errors'] || {}
        if errors.kind_of?(Array)
          # 3.2.1-style with array of strings
          ActiveSupport::Deprecation.warn('Returning errors as an array of strings is deprecated.')
          from_array errors, save_cache
        else
          # 3.2.2+ style
          from_hash errors, save_cache
        end
      else
        # <3.2-style respond_with - lacks 'errors' key
        ActiveSupport::Deprecation.warn('Returning errors as a hash without a root "errors" key is deprecated.')
        from_hash decoded, save_cache
      end
    end
  end
end

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