#online_exam_controller
class OnlineExamController < ApplicationController
def index
@user=current_user
@employee=Employee.find_by_employee_number(@user.username)
# flash[:notice]="#{@employee.id}"
@subjects=EmployeesSubject.find_all_by_employee_id(@employee.id)
@subject_name=[]
@batch_details=[]
@display_details=[[]]
@count=0
for @t in @subjects
@subject_name[@count]=Subject.find(@t.subject_id,:select=>'name,code,batch_id')
@batch_details[@count]=Batch.find(@subject_name[@count].batch_id,:select =>'name')
@display_details[@count][0]=@subject_name[@count].name+" "+@batch_details[@count].name
@display_details[@count][1]=@t.subject_id
@count+=1
end
end
def show
if params[:subject_id]==''
@question_type=[]
else
@question_type=['multiple_choice','fill_ups','matches','descriptive']
@subject_id=params[:subject_id]
end
respond_to do |format|
format.js {render:action=>'show' }
end
end
def new_multiple_choice
@quiz=MultipleChoiceQuestion.new
@subject=Subject.find params[:id] if request.xhr? and params[:id]
respond_to do |format|
format.js {render :action => 'new_multiple_choice'}
end
end
end
#index.html.erb
<div id="content-header">
<img src="/images/show_settings.png" alt="Subjects"/>
<h1>Subjects</h1>
<h3>Home</h3>
<div id="app-back-button">
<%= link_to_function image_tag("/images/buttons/back.png",:border => 0), "history.back()" %>
</div>
</div>
<div id="page-yield">
<% unless flash[:notice].nil? %>
<p class="flash-msg"> <%= flash[:notice] %> </p>
<% end %>
<div class="box">
<div class="label-field-pair">
<label for="student_course">Select a batch:
<%= image_tag("loader.gif",:align => "absmiddle",:border => 0,:id => "loader", :style =>"display: none;" ) %>
</label>
<div class="text-input-bg">
<%= select :subject,:id,
@display_details.map {|b| [b[0],b[1]]},
{:prompt => 'selecct subject'},
{:onchange =>"#{remote_function(
:url=>{:action => 'show'},
:before=> "Element.show('loader')",
:success => "Element.hide('loader')" )}"}%>
</div></div>
<div id="subjects"></div>
<div id="modal-box" style="display:none;"></div>
<div class="extender"></div>
</div></div>
#show.rjs
if @question_type.empty?
page.replace_html 'subjects', :partial => 'question_bank'
else
page.replace_html 'subjects', :partial => 'question_bank'
end
#_question_bank.html.erb
<% unless @question_type.nil? %>
<div class="add_sub">
<%= link_to_remote 'Add Multiple Question ', :url => { :action => 'new_multiple_choice', :id => @subject_id } %>
</div>
<div class="add_sub">
<%= link_to_remote 'Add Fill Up Question', :url => { :action => 'new_fill_ups', :id => @subject_id } %>
</div>
<div class="add_sub">
<%= link_to_remote 'Add Match Question', :url => { :action => 'new_matches', :id => @subject_id } %>
</div>
<div class="add_sub">
<%= link_to_remote 'Add Descriptive Question', :url => { :action => 'new_descriptive', :id => @subject_id } %>
</div>
<% end %>
#new_multiple_choice.rjs
page.replace_html 'modal-box', :partial => 'new_multiple_choice'
page << "Modalbox.show($('modal-box'), {title: 'Add new multiple choice questions', width: 500});"
#_new_multiple_choice.html.erb
<div id="grading-levels-form">
<h4><%= @subject.name unless @subject.nil? %></h4>
<% form_remote_for @quiz do |f| %>
<% subject_id = (@subject.nil? ? nil : @subject.id) %>
<% batch_id = (@subject.nil? ? nil : @subject.batch_id ) %>
<%= f.hidden_field :batch_id, :value => batch_id %>
<%= f.hidden_field :subject_id, :value => elective_group_id %>
<div id="form-errors"></div>
<div class="label-field-pair">
<div class="label-container"><%= f.label :question %></div>
<div class="input-container"> <%= f.text_field :question %></div>
</div>
<div class="label-field-pair">
<div class="label-container"><%= f.label :answer1 %></div>
<div class="input-container"> <%= f.text_field :answer1 %></div>
</div>
<div class="label-field-pair">
<div class="label-container"><%= f.label :answer2 %></div>
<div class="input-container"> <%= f.text_field :answer2 %></div>
</div>
<div class="label-field-pair">
<div class="label-container"><%= f.label :answer3 %></div>
<div class="input-container"> <%= f.text_field :answer3 %></div>
</div>
<div class="label-field-pair">
<div class="label-container"><%= f.label :answer4 %></div>
<div class="input-container"> <%= f.text_field :answer4 %></div>
</div>
<div class="label-field-pair">
<div class="label-container"> <%= f.label :correct_option %></div>
<div class="input-container"><%= f.select (:correct_option,%w{1,2,3,4}) %></div>
</div>
<%= f.submit "", :value => "► Save", :class => "submit_button" %>
<% end %>
</div>
#server log
Processing OnlineExamController#show (for 127.0.0.1 at 2011-04-05 19:31:00) [POST]
Parameters: {"action"=>"show", "authenticity_token"=>"OXozxkL1y+gCKkWxsUbAR8nH9Cb8MJJJPtnEVw8Y1AI=", "controller"=>"online_exam"}
User Columns (0.8ms) SHOW FIELDS FROM `users`
User Load (0.1ms) SELECT * FROM `users` WHERE (`users`.`id` = 8)
CACHE (0.0ms) SELECT * FROM `users` WHERE (`users`.`id` = 8)
Rendering online_exam/show
Rendered online_exam/_question_bank (5.6ms)
Completed in 21ms (View: 8, DB: 3) | 200 OK [http://localhost/online_exam/show]
SQL (4.7ms) SET SQL_AUTO_IS_NULL=0
Processing OnlineExamController#show (for 127.0.0.1 at 2011-04-05 19:31:02) [POST]
Parameters: {"action"=>"show", "authenticity_token"=>"OXozxkL1y+gCKkWxsUbAR8nH9Cb8MJJJPtnEVw8Y1AI=", "controller"=>"online_exam"}
User Columns (1.0ms) SHOW FIELDS FROM `users`
User Load (0.8ms) SELECT * FROM `users` WHERE (`users`.`id` = 8)
CACHE (0.0ms) SELECT * FROM `users` WHERE (`users`.`id` = 8)
Rendering online_exam/show
Rendered online_exam/_question_bank (5.6ms)
Processing OnlineExamController#new_multiple_choice (for 127.0.0.1 at 2011-04-05 19:31:04) [POST]
Parameters: {"action"=>"new_multiple_choice", "authenticity_token"=>"OXozxkL1y+gCKkWxsUbAR8nH9Cb8MJJJPtnEVw8Y1AI=", "controller"=>"online_exam"}
User Columns (1.1ms) SHOW FIELDS FROM `users`
User Load (0.1ms) SELECT * FROM `users` WHERE (`users`.`id` = 8)
CACHE (0.0ms) SELECT * FROM `users` WHERE (`users`.`id` = 8)
MultipleChoiceQuestion Columns (1.0ms) SHOW FIELDS FROM `multiple_choice_questions`
Completed in 22ms (View: 2, DB: 2) | 200 OK [http://localhost/online_exam/new_multiple_choice]
SQL (0.1ms) SET SQL_AUTO_IS_NULL=0 here
我知道代码很长，几个小时都没关系了，当我点击最后的第一个链接时，我的问题_new_multiple_choice.html.erb没有呈现。
答案 0 :(得分：6)
大多数Rubyist会被这段代码吓坏，然后逃跑。而不是回答你的问题（如果解决了，会使你的应用程序更加可怕），这里有一些基础知识;做这些，这样你就可以开始提出人们会回答的问题了。
Rails为您完成大部分工作，因此您无需查找与ID的关系或自行设置数组。实例变量用于将事物传递给视图。尝试准确地传递视图所需的内容，而不是更多。
首先，建立与模型的关系......
<强>模型/ user.rb
class User
has_one :employee
end
<强>模型/ employee.rb
class Employee
belongs_to :user
has_and_belongs_to_many :employee_subjects
end
<强>模型/ employee_subject.rb
class EmployeeSubject
has_and_belongs_to_many :employees
has_one :batch
end
<强>模型/ batch.rb
class Batch
belongs_to :employee_subject
end
has_and_belongs_to_many有点棘手，所以请仔细阅读文档： http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#method-i-has_and_belongs_to_many
然后，您可以将控制器操作简化为一行......
<强>控制器/ online_exams_controller.rb
def index
@subjects = current_user.employee.employee_subjects
end
并在您的观点中......
<强>视图/ online_exams / index.html.erb
<ul>
<%= render :partial => '/subjects/list_view', :collection => @subjects, :as => :subject %>
</ul>
<强>视图/ employee_subjects / _list_view.html.erb
<li>
Name: <%= subject.name -%>, Code: <%= subject.code -%>,
Batch Name: <%= subject.batch.name -%>
</li>
在进行更多操作之前，请先考虑应用程序的对象应如何组织和相关，并尝试使用有意义的名称。阅读有关面向对象编程概念的更多信息，并遵循一些Rails教程，并习惯使代码行数减少10倍的应用程序！