學習RoR第一個項目CS169 edX

Question

我正在做第二個作業，僅供參考這是一個完整的版本http://alexandre-alcobia.herokuapp.com/movies我似乎無法讓我的「電影標題」和「發佈日期」標題成爲鏈接。 我覺得有一些錯誤的視圖文件，但我也包括控制器的相關部分，因爲當我手動包括？sort =標題到URI結束時，它不會最終排序。

這裏的MoviesController.rb

class MoviesController < ApplicationController 
    ... 
     def index 
     @movies = Movie.all unless params["sort"] == nil 
     @movies = Movie.order('movies.title').all if params["sort"] == "title" 
     @movies = Movie.order('movies.release_date').all if params["sort"] == "release_date" 
     end 
    ... 
    end 

和這裏的index.html.haml

-# This file is app/views/movies/index.html.haml 
    %h1 All Movies 
    %table#movies 
     %thead 
     %tr 
      %th{:class => @title_header} 
      = link_to "Movie Title", {:sort => :title}, {:id => :title_header} 
      %th Rating 
      %th{:class => @release_header} 
      = link_to "Release Date", {:sort => :release_date}, {:id => :release_header} 
      %th More Info 
     %tbody 
     - @movies.each do |movie| 
      %tr 
      %td= movie.title 
      %td= movie.rating 
      %td= movie.release_date 
      %td= link_to "More about #{movie.title}", movie_path(movie) 

= link_to 'Add new movie', new_movie_path 

而且我還沒有開始由等級部分的過濾器，從而忽略的是，在例子。

編輯：這裏是下面

undefined method `order' for #<Array:0xae00ad8> 

在評論中提到的錯誤和這裏的一些框架跟蹤的（不知道這是什麼意思...文本壁抱歉）

actionpack (3.1.0) lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
actionpack (3.1.0) lib/abstract_controller/base.rb:167:in `process_action' 
actionpack (3.1.0) lib/action_controller/metal/rendering.rb:10:in `process_action' 
actionpack (3.1.0) lib/abstract_controller/callbacks.rb:18:in `block in process_action' 
activesupport (3.1.0) lib/active_support/callbacks.rb:416:in `_run__379635507__process_action__868408152__callbacks' 
activesupport (3.1.0) lib/active_support/callbacks.rb:386:in `_run_process_action_callbacks' 
activesupport (3.1.0) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.1.0) lib/abstract_controller/callbacks.rb:17:in `process_action' 
actionpack (3.1.0) lib/action_controller/metal/rescue.rb:17:in `process_action' 
actionpack (3.1.0) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 
activesupport (3.1.0) lib/active_support/notifications.rb:53:in `block in instrument' 
activesupport (3.1.0) lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
activesupport (3.1.0) lib/active_support/notifications.rb:53:in `instrument' 
actionpack (3.1.0) lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
actionpack (3.1.0) lib/action_controller/metal/params_wrapper.rb:201:in `process_action' 
activerecord (3.1.0) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
actionpack (3.1.0) lib/abstract_controller/base.rb:121:in `process' 
actionpack (3.1.0) lib/abstract_controller/rendering.rb:45:in `process' 
actionpack (3.1.0) lib/action_controller/metal.rb:193:in `dispatch' 
actionpack (3.1.0) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 
actionpack (3.1.0) lib/action_controller/metal.rb:236:in `block in action' 
actionpack (3.1.0) lib/action_dispatch/routing/route_set.rb:65:in `call' 
actionpack (3.1.0) lib/action_dispatch/routing/route_set.rb:65:in `dispatch' 
actionpack (3.1.0) lib/action_dispatch/routing/route_set.rb:29:in `call' 
rack-mount (0.8.3) lib/rack/mount/route_set.rb:152:in `block in call' 
rack-mount (0.8.3) lib/rack/mount/code_generation.rb:96:in `block in recognize' 
rack-mount (0.8.3) lib/rack/mount/code_generation.rb:75:in `optimized_each' 
rack-mount (0.8.3) lib/rack/mount/code_generation.rb:95:in `recognize' 
rack-mount (0.8.3) lib/rack/mount/route_set.rb:141:in `call' 
actionpack (3.1.0) lib/action_dispatch/routing/route_set.rb:531:in `call' 
actionpack (3.1.0) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' 
rack (1.3.5) lib/rack/etag.rb:23:in `call' 
rack (1.3.5) lib/rack/conditionalget.rb:25:in `call' 
actionpack (3.1.0) lib/action_dispatch/middleware/head.rb:14:in `call' 
actionpack (3.1.0) lib/action_dispatch/middleware/params_parser.rb:21:in `call' 
actionpack (3.1.0) lib/action_dispatch/middleware/flash.rb:243:in `call' 
rack (1.3.5) lib/rack/session/abstract/id.rb:195:in `context' 
rack (1.3.5) lib/rack/session/abstract/id.rb:190:in `call' 
actionpack (3.1.0) lib/action_dispatch/middleware/cookies.rb:326:in `call' 
activerecord (3.1.0) lib/active_record/query_cache.rb:62:in `call' 
activerecord (3.1.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:477:in `call' 
actionpack (3.1.0) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' 
activesupport (3.1.0) lib/active_support/callbacks.rb:392:in `_run_call_callbacks' 
activesupport (3.1.0) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.1.0) lib/action_dispatch/middleware/callbacks.rb:28:in `call' 
actionpack (3.1.0) lib/action_dispatch/middleware/reloader.rb:68:in `call' 
rack (1.3.5) lib/rack/sendfile.rb:101:in `call' 
actionpack (3.1.0) lib/action_dispatch/middleware/remote_ip.rb:48:in `call' 
actionpack (3.1.0) lib/action_dispatch/middleware/show_exceptions.rb:47:in `call' 
railties (3.1.0) lib/rails/rack/logger.rb:13:in `call' 
rack (1.3.5) lib/rack/methodoverride.rb:24:in `call' 
rack (1.3.5) lib/rack/runtime.rb:17:in `call' 
activesupport (3.1.0) lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
rack (1.3.5) lib/rack/lock.rb:15:in `call' 
actionpack (3.1.0) lib/action_dispatch/middleware/static.rb:53:in `call' 
railties (3.1.0) lib/rails/engine.rb:455:in `call' 
railties (3.1.0) lib/rails/rack/content_length.rb:16:in `call' 
railties (3.1.0) lib/rails/rack/log_tailer.rb:14:in `call' 
rack (1.3.5) lib/rack/handler/webrick.rb:59:in `service' 
/usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service' 
/usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run' 
/usr/local/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread' 

Answer 1

你在使用Rails 4嗎？這應該工作

def index 
    @movies = Movie.all 
    @movies.order!(:title) if params["sort"] == "title" 
    @movies.order!(:release_date) if params["sort"] == "release_date" 
    end 

如果您使用Rails 3，修改您的控制器像這個：

def index 
    @movies = Movie.all 
    @movies = @movies.order(:title) if params["sort"] == "title" 
    @movies = @movies.order(:release_date) if params["sort"] == "release_date" 
    end 

你Rails的什麼都爲版本，你的鏈接應該是這樣的：

= link_to "Movie Title", movies_path(:sort => 'title'), {:id => :title_header} 
    ... 
    = link_to "Release Date", movies_path(:sort => 'release_date'), {:id => :release_header}