如何将 redmine 插件升级到 rails 5，现在不推荐使用 alias_method_chain

Question

故事模式

刚开始学习RoR，但短期内需要在项目中添加类似于Loading images from LDAP（不兼容版本）的功能。项目已废弃，我找不到任何相关的信息/文档，所以我在这里寻求帮助。解决方案，教程，任何东西都可以。

错误日志

$ ruby bin/rake redmine:plugins RAILS_ENV="production"
rake aborted!
NoMethodError: undefined method `alias_method_chain' for ApplicationHelper:Module
Did you mean?  alias_method
...

需要更新的猴子补丁

插件\redmine_gemavatar\lib\application_helper_gemavatar_patch.rb：

require 'application_helper'

module GemAvatarPlugin
    module ApplicationAvatarPatch
        def self.included(base)
            base.send(:include, InstanceMethods)
            base.class_eval do
                alias_method_chain :avatar, :gemavatar
            end
        end
        module InstanceMethods
            def avatar_with_gemavatar(user, options = { })
                if Setting.gravatar_enabled? && user.is_a?(User)
                    options.merge!({:ssl => (defined?(request) && request.ssl?), :default => Setting.gravatar_default})
                    options[:size] = "64" unless options[:size]
                    avatar_url = url_for :controller => :pictures, :action => :delete, :user_id => user
                    return "<img class=\"gravatar\" width=\"#{options[:size]}\" height=\"#{options[:size]}\" src=\"#{avatar_url}\" />".html_safe
                else
                    ''
                end
            end
        end
    end
end

我的尝试/文章

我在这里How To Replace alias_method_chain 找到了好文章，但我不太确定如何将prepend 样式应用于 redmine 插件的猴子补丁。只是无法让它工作：/

Answer 1

这和this plugin有关吗？

如果是这样，我会这样做：

• 在init.rb 文件中，更改以下内容：

RedmineApp::Application.config.after_initialize do
  ApplicationHelper.send(:include, GemAvatarPlugin::ApplicationAvatarPatch)
end

到这里：

RedmineApp::Application.config.after_initialize do
  ApplicationHelper.prepend(GemAvatarPlugin::ApplicationAvatarPatch)
end

• 在 lib/application_helper_gemavatar_patch.rb 中，更改：

require 'application_helper'

module GemAvatarPlugin
  module ApplicationAvatarPatch

    def self.included(base)
      base.send(:include, InstanceMethods)
      base.class_eval do
        alias_method_chain :avatar, :gemavatar
      end
    end

    module InstanceMethods

      def avatar_with_gemavatar(user, options = { })
        # method content omitted for clarity
      end

    end
  end
end

到这里：

module GemAvatarPlugin
  module ApplicationAvatarPatch

    def avatar(user, options = { })
      # method content omitted for clarity
    end

  end
end

我会删除 require 'application_helper'，因为我不明白为什么需要它

Answer 2

我也尝试更新这个插件。我以https://github.com/alexandermeindl/redmine_local_avatars 为例。

在 init.rb 中改变了这个：

RedmineApp::Application.config.after_initialize do
  ApplicationHelper.send(:include, GemAvatarPlugin::ApplicationAvatarPatch)
end

到这里：

RedmineApp::Application.config.after_initialize do    
  ApplicationHelper.include ApplicationAvatarPatch
end

修补后的 lib/application_helper_gemavatar_patch.rb，如下所示：

module ApplicationAvatarPatch    
def self.included(base)
    base.send(:include, InstanceMethods)

    base.class_eval do
        alias_method :avatar_without_gemavatar, :avatar
        alias_method :avatar, :avatar_with_gemavatar
    end
end

module InstanceMethods
    def avatar_with_gemavatar(user, options = { })
        if Setting.gravatar_enabled? && user.is_a?(User)
            options.merge!({:ssl => (defined?(request) && request.ssl?), :default => Setting.gravatar_default})
            options[:size] = "64" unless options[:size]
            avatar_url = url_for :controller => :pictures, :action => :delete, :user_id => user
            return "<img class=\"gravatar\" width=\"#{options[:size]}\" height=\"#{options[:size]}\" src=\"#{avatar_url}\" alt=\"Gemavatar text\" />".html_safe
        else
            avatar_without_gemavatar(user, options)
        end
    end
end
end

我仅在 Redmine 4.0.3 上尝试过，但它似乎可以正常工作。但是网络服务器日志中有警告：

127.0.0.1 - - [06/Mar/2020:20:58:23 CET] "GET /gemavatar/164 HTTP/1.1" 200 3545
http://tredmine1:3000/users/164 -> /gemavatar/164
[2020-03-06 20:58:23] WARN  Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true

在 redmine_local_avatars 插件中，Redmine 4.1 有一个不同的补丁。

更新：我设置了一个带有更改的 github 存储库：https://github.com/pentekl/redmine_gemavatar

Answer 3

您可以使用alias_method 代替alias_method_chain，但我正在寻找类似prepend 的解决方案

                alias_method :avatar_without_gemavatar, :avatar
                alias_method :avatar, :avatar_with_gemavatar

统一更新： 但它会引发警告：

/app/helpers/application_helper.rb:180: warning: already initialized constant ApplicationHelper
::RECORD_LINK
/app/helpers/application_helper.rb:180: warning: previous definition of RECORD_LINK was here
/app/helpers/application_helper.rb:199: warning: already initialized constant ApplicationHelper
::ATTACHMENT_CONTAINER_LINK
/app/helpers/application_helper.rb:199: warning: previous definition of ATTACHMENT_CONTAINER_LI
NK was here
/app/helpers/application_helper.rb:1053: warning: already initialized constant ApplicationHelpe
r::LINKS_RE
/app/helpers/application_helper.rb:1053: warning: previous definition of LINKS_RE was here
Exiting

统一更新： 作为ste26054 mentioned in his answerand commented here require 'application_helper' 可以删除以防止出现警告，因为它已经包含在核心中。