TypeError：错误的参数类型具有Controller关注的类（预期模块）
所以我有一个名为guests_controller.rb的控制器，如下所示：
class GuestsController < ApplicationController include Data def index display_data("db") display_data("session") end def new @guest = Guest.new end def create case params[:option] when '0' logger.debug 'Salvestame andmebaasi' save_data("db") when '1' logger.debug 'Salvestame sessiooni' save_data("session") end end private def guest_params params.require(:guest).permit(:name, :text) end end 而且我在控制器/ concens /中有一个名为data.rb的问题：
module Data extend ActiveSupport:Concern def save_data(save_method) case save_method when "db" @guest = Guest.new(guest_params) if @guest.save flash[:success] = "New guest entry created!" redirect_to guests_path else render 'new' end when "session" name = params[:guest][:name].to_s text = params[:guest][:text].to_s @guests_session = session[:guests] if session[:guests].nil? @guests_session = [{:name => 'temp', :text => 'temp'}] else logger.debug @guests_session @guests_session.push({:name => name, :text => text}) end session[:guests] = @guests_session redirect_to guests_path end end def display_data(display_method) case display_method when "db" @guests = Guest.all when "session" if session[:guests].nil? @guests_session = [{:name => 'temp', :text => 'temp'}] else #@guests_session = [{:name => 'temp', :text => 'temp'}] @guests_session = session[:guests] end end end end
现在，当我打开相应的视图时，我收到此错误：
GuestsController中的TypeError #index错误的参数类型类（预期的模块）
使用堆栈跟踪：
app/controllers/guests_controller.rb:2:in `include' app/controllers/guests_controller.rb:2:in `' app/controllers/guests_controller.rb:1:in `' activesupport (4.1.5) lib/active_support/dependencies.rb:443:in `load' activesupport (4.1.5) lib/active_support/dependencies.rb:443:in `block in load_file' activesupport (4.1.5) lib/active_support/dependencies.rb:633:in `new_constants_in' activesupport (4.1.5) lib/active_support/dependencies.rb:442:in `load_file' activesupport (4.1.5) lib/active_support/dependencies.rb:342:in `require_or_load' activesupport (4.1.5) lib/active_support/dependencies.rb:480:in `load_missing_constant' activesupport (4.1.5) lib/active_support/dependencies.rb:180:in `const_missing' activesupport (4.1.5) lib/active_support/inflector/methods.rb:238:in `const_get' activesupport (4.1.5) lib/active_support/inflector/methods.rb:238:in `block in constantize' activesupport (4.1.5) lib/active_support/inflector/methods.rb:236:in `each' activesupport (4.1.5) lib/active_support/inflector/methods.rb:236:in `inject' activesupport (4.1.5) lib/active_support/inflector/methods.rb:236:in `constantize' activesupport (4.1.5) lib/active_support/dependencies.rb:552:in `get' activesupport (4.1.5) lib/active_support/dependencies.rb:583:in `constantize' actionpack (4.1.5) lib/action_dispatch/routing/route_set.rb:78:in `controller_reference' actionpack (4.1.5) lib/action_dispatch/routing/route_set.rb:68:in `controller' actionpack (4.1.5) lib/action_dispatch/routing/route_set.rb:46:in `call' actionpack (4.1.5) lib/action_dispatch/journey/router.rb:71:in `block in call' actionpack (4.1.5) lib/action_dispatch/journey/router.rb:59:in `each' actionpack (4.1.5) lib/action_dispatch/journey/router.rb:59:in `call' actionpack (4.1.5) lib/action_dispatch/routing/route_set.rb:678:in `call' warden (1.2.3) lib/warden/manager.rb:35:in `block in call' warden (1.2.3) lib/warden/manager.rb:34:in `catch' warden (1.2.3) lib/warden/manager.rb:34:in `call' rack (1.5.2) lib/rack/etag.rb:23:in `call' rack (1.5.2) lib/rack/conditionalget.rb:25:in `call' rack (1.5.2) lib/rack/head.rb:11:in `call' actionpack (4.1.5) lib/action_dispatch/middleware/params_parser.rb:27:in `call' actionpack (4.1.5) lib/action_dispatch/middleware/flash.rb:254:in `call' rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context' rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call' actionpack (4.1.5) lib/action_dispatch/middleware/cookies.rb:560:in `call' activerecord (4.1.5) lib/active_record/query_cache.rb:36:in `call' activerecord (4.1.5) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call' activerecord (4.1.5) lib/active_record/migration.rb:380:in `call' actionpack (4.1.5) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' activesupport (4.1.5) lib/active_support/callbacks.rb:82:in `run_callbacks' actionpack (4.1.5) lib/action_dispatch/middleware/callbacks.rb:27:in `call' actionpack (4.1.5) lib/action_dispatch/middleware/reloader.rb:73:in `call' actionpack (4.1.5) lib/action_dispatch/middleware/remote_ip.rb:76:in `call' actionpack (4.1.5) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call' actionpack (4.1.5) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' railties (4.1.5) lib/rails/rack/logger.rb:38:in `call_app' railties (4.1.5) lib/rails/rack/logger.rb:20:in `block in call' activesupport (4.1.5) lib/active_support/tagged_logging.rb:68:in `block in tagged' activesupport (4.1.5) lib/active_support/tagged_logging.rb:26:in `tagged' activesupport (4.1.5) lib/active_support/tagged_logging.rb:68:in `tagged' railties (4.1.5) lib/rails/rack/logger.rb:20:in `call' actionpack (4.1.5) lib/action_dispatch/middleware/request_id.rb:21:in `call' rack (1.5.2) lib/rack/methodoverride.rb:21:in `call' rack (1.5.2) lib/rack/runtime.rb:17:in `call' activesupport (4.1.5) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call' rack (1.5.2) lib/rack/lock.rb:17:in `call' actionpack (4.1.5) lib/action_dispatch/middleware/static.rb:64:in `call' rack (1.5.2) lib/rack/sendfile.rb:112:in `call' railties (4.1.5) lib/rails/engine.rb:514:in `call' railties (4.1.5) lib/rails/application.rb:144:in `call' passenger (4.0.50) lib/phusion_passenger/rack/thread_handler_extension.rb:74:in `process_request' passenger (4.0.50) lib/phusion_passenger/request_handler/thread_handler.rb:141:in `accept_and_process_next_request' passenger (4.0.50) lib/phusion_passenger/request_handler/thread_handler.rb:109:in `main_loop' passenger (4.0.50) lib/phusion_passenger/request_handler.rb:455:in `block (3 levels) in start_threads'
我基本上只是想学习如何使用控制器的问题。 我想分离一大堆我的代码并将其放入相应的关注点以保持控制器的美观和清洁。
谷歌搜索或搜索控制器的问题时没有太多可以找到，所以我提出这个新问题希望得到帮助。
那么如何解决这个问题以及我做错了什么？
您遇到了名称冲突 – Data类存在于核心Ruby： 链接中 。 这意味着Rails不会启动const_missing，并且永远不会加载您的顾虑。 将您的关注重命名为DateModule或类似的。
你在Data关注中做了一个简单的错字 – 它应该extend ActiveSupport::Concern （注意双冒号，它是Ruby中的命名空间分隔符）。