用戶模型修補程序僅適用於幾個請求

Question

我需要我的Redmine插件的修補程序，以便爲用戶模型添加新的'has_many'關係。它在開發模式下啓動rails服務器後工作了一段時間，但奇怪的是，在幾次請求後停止工作。

這裏是我的補丁：

require_dependency 'project' 
require_dependency 'principal' 
require_dependency 'user' 

module UserPatch 
    def self.included(base) 
    base.extend(ClassMethods) 

    base.send(:include, InstanceMethods) 

    # Same as typing in the class 
    base.class_eval do 
     unloadable # Send unloadable so it will not be unloaded in development 
     has_many :favourites 

    end 

    end 

    module ClassMethods 

    end 

    module InstanceMethods 
    end 

end 

User.send(:include, UserPatch) 

下面是錯誤日誌：

NoMethodError (undefined method `favourites' for #<User:0x007f99cbc3d478>): 
    activemodel (3.2.3) lib/active_model/attribute_methods.rb:407:in `method_missing' 
    activerecord (3.2.3) lib/active_record/attribute_methods.rb:148:in `method_missing' 
    plugins/redmine_asset_tracker/app/controllers/asset_types_controller.rb:20:in `index' 
    actionpack (3.2.3) lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
    actionpack (3.2.3) lib/abstract_controller/base.rb:167:in `process_action' 
    actionpack (3.2.3) lib/action_controller/metal/rendering.rb:10:in `process_action' 
    actionpack (3.2.3) lib/abstract_controller/callbacks.rb:18:in `block in process_action' 
    activesupport (3.2.3) lib/active_support/callbacks.rb:447:in `_run__2420136461919276817__process_action__3214240126008154381__callbacks' 
    activesupport (3.2.3) lib/active_support/callbacks.rb:405:in `__run_callback' 
    activesupport (3.2.3) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' 
    activesupport (3.2.3) lib/active_support/callbacks.rb:81:in `run_callbacks' 
    actionpack (3.2.3) lib/abstract_controller/callbacks.rb:17:in `process_action' 
    actionpack (3.2.3) lib/action_controller/metal/rescue.rb:29:in `process_action' 
    actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 
    activesupport (3.2.3) lib/active_support/notifications.rb:123:in `block in instrument' 
    activesupport (3.2.3) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
    activesupport (3.2.3) lib/active_support/notifications.rb:123:in `instrument' 
    actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
    actionpack (3.2.3) lib/action_controller/metal/params_wrapper.rb:205:in `process_action' 
    activerecord (3.2.3) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
    actionpack (3.2.3) lib/abstract_controller/base.rb:121:in `process' 
    actionpack (3.2.3) lib/abstract_controller/rendering.rb:45:in `process' 
    actionpack (3.2.3) lib/action_controller/metal.rb:203:in `dispatch' 
    actionpack (3.2.3) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 
    actionpack (3.2.3) lib/action_controller/metal.rb:246:in `block in action' 
    actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:73:in `call' 
    actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:73:in `dispatch' 
    actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:36:in `call' 
    journey (1.0.3) lib/journey/router.rb:68:in `block in call' 
    journey (1.0.3) lib/journey/router.rb:56:in `each' 
    journey (1.0.3) lib/journey/router.rb:56:in `call' 
    actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:600:in `call' 
    rack-openid (1.3.1) lib/rack/openid.rb:98:in `call' 
    actionpack (3.2.3) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' 
    rack (1.4.1) lib/rack/etag.rb:23:in `call' 
    rack (1.4.1) lib/rack/conditionalget.rb:25:in `call' 
    actionpack (3.2.3) lib/action_dispatch/middleware/head.rb:14:in `call' 
    actionpack (3.2.3) lib/action_dispatch/middleware/params_parser.rb:21:in `call' 
    actionpack (3.2.3) lib/action_dispatch/middleware/flash.rb:242:in `call' 
    rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context' 
    rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call' 
    actionpack (3.2.3) lib/action_dispatch/middleware/cookies.rb:338:in `call' 
    activerecord (3.2.3) lib/active_record/query_cache.rb:64:in `call' 
    activerecord (3.2.3) lib/active_record/connection_adapters/abstract/connection_pool.rb:467:in `call' 
    actionpack (3.2.3) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' 
    activesupport (3.2.3) lib/active_support/callbacks.rb:405:in `_run__4577554638097020546__call__1559518111822758715__callbacks' 
    activesupport (3.2.3) lib/active_support/callbacks.rb:405:in `__run_callback' 
    activesupport (3.2.3) lib/active_support/callbacks.rb:385:in `_run_call_callbacks' 
    activesupport (3.2.3) lib/active_support/callbacks.rb:81:in `run_callbacks' 
    actionpack (3.2.3) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
    actionpack (3.2.3) lib/action_dispatch/middleware/reloader.rb:65:in `call' 
    actionpack (3.2.3) lib/action_dispatch/middleware/remote_ip.rb:31:in `call' 
    actionpack (3.2.3) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' 
    actionpack (3.2.3) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' 
    railties (3.2.3) lib/rails/rack/logger.rb:26:in `call_app' 
    railties (3.2.3) lib/rails/rack/logger.rb:16:in `call' 
    actionpack (3.2.3) lib/action_dispatch/middleware/request_id.rb:22:in `call' 
    rack (1.4.1) lib/rack/methodoverride.rb:21:in `call' 
    rack (1.4.1) lib/rack/runtime.rb:17:in `call' 
    activesupport (3.2.3) lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
    rack (1.4.1) lib/rack/lock.rb:15:in `call' 
    actionpack (3.2.3) lib/action_dispatch/middleware/static.rb:62:in `call' 
    railties (3.2.3) lib/rails/engine.rb:479:in `call' 
    railties (3.2.3) lib/rails/application.rb:220:in `call' 
    rack (1.4.1) lib/rack/content_length.rb:14:in `call' 
    railties (3.2.3) lib/rails/rack/log_tailer.rb:14:in `call' 
    rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service' 
    /Users/myth/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service' 
    /Users/myth/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run' 
    /Users/myth/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread' 

我要去哪裏錯了？

Answer 1

難道是你的模型重新加載，但這個擴展不？如果您將模型本身的擴展包含在內，會發生什麼？

Answer 2

由於這隻在開發環境中不起作用，所以在開發中重載類是一個問題。

添加在您config/environments/development.rb一個配置：

config.to_prepare do 
    load 'user_patch.rb' 
end 

應該確保它重新加載爲每個請求。

有了這個，您可能會驚訝於該模塊可能包含多次用戶，要修復它，您可以使用ActiveSupport::Concern。

有2個問題，它可以幫助你：

• Re-open an ActiveRecord model that's provided by a gem
• Rails extending ActiveRecord::Base

Answer 3

試試這個：

module UserPatch 
    def self.included(base) 
    base.extend(ClassMethods) 
    base.send(:include, InstanceMethods) 
    # Note the change below 
    base.unloadable 
    base.has_many :favourites 
    end 

    module ClassMethods  
    end 

    module InstanceMethods 
    end 

end 

您可以運行在類的類方法included部分。

Answer 4

您是否在使用乘客？如果您使用的是乘客，可能難以確保何時加載，使用加載物體的距離等。

我有類似的問題in this question，我無法得到答案。我也以類似的方式進行了全局變量初始化，似乎不能保證工作。

我解決了我的問題，不依賴於何時/多少次超出方法的語句執行運行。

問題的一部分可以通過已經給出的答案來避免，但就您使用乘客而言，就我而言，這並不容易。