formtastic गतिशील Activeadmin चयन

Question

मैं बहुत तरह Activeadmin के formtastic के माध्यम से एक गतिशील विकल्प का चयन करना चाहते हैं। मुझे क्या परिवर्तन करना चाहिए?

मैं नीचे के रूप में 4 मॉडल है:

class Student < ActiveRecord::Base 
    has_many :lessons 
    has_many :users, through: :lessons 
    has_many :exam_registrations, through: :lessons 

class Lesson < ActiveRecord::Base 
    belongs_to :user 
    belongs_to :student 
    belongs_to :exam_registration 

class User < ActiveRecord::Base 
    has_many :lessons 
    has_many :students, through: :lessons 
    has_many :exam_registrations, through: :lessons 

class ExamRegistration < ActiveRecord::Base 
    has_many :lessons 
    has_many :users, through: :lessons 
    has_many :students, through: :lessons 

Answer 1

हल किसी और को एक ही समस्या के साथ कुश्ती के लिए, यह railscast

पर देखने के लिए यहाँ कैसे मैं activeadmin में एक से अधिक गतिशील चयन मेनू लागू किया है :

कॉन्फ़िगर/प्रारंभकर्ता/active_admin.rb

config.register_javascript 'exam_registrations.js.coffee' 

एप्लिकेशन/व्यवस्थापक/exam_registrations.rb

form do |f| 
    f.inputs "Exam Registration Details" do 
     f.input :user_id, :label => 'Teacher', :as => :select, :collection => User.where(:admin => 'false', :active => true).order(:name), :include_blank => true 
     f.input :student_id, :hint => 'Students grouped by teacher names', :as => :select, :collection => option_groups_from_collection_for_select(User.where(:admin => false, :active => true).order(:name), :students, :name, :id, :name) 
     f.input :lesson_id, :hint => 'Lessons grouped by student names', :as => :select, :collection => option_groups_from_collection_for_select(Student.where(:active => true).order(:name), :lessons, :name, :id, :name) 
    end 
    f.buttons 
    end 

एप्लिकेशन/आस्तियों/javascripts/exam_registrations.js.coffee

#first menu  
jQuery -> 
     $('#exam_registration_student_id').parent().hide() 
     students = $('#exam_registration_student_id').html() 
     $('#exam_registration_user_id').change -> 
     user = $('#exam_registration_user_id :selected').text() 
     escaped_user = user.replace(/([ #;&,.+*~\':"!^$[\]()=>|\/@])/g, '\\$1') 
     options = $(students).filter("optgroup[label='#{escaped_user}']").html() 
     if options 
      $('#exam_registration_student_id').html(options) 
      $('#exam_registration_student_id').parent().show() 
     else 
      $('#exam_registration_student_id').empty() 
      $('#exam_registration_lesson_id').empty() 

# second menu 
    $('#exam_registration_lesson_id').parent().hide() 
    lessons = $('#exam_registration_lesson_id').html() 
    $('#exam_registration_student_id').click -> 
    student = $('#exam_registration_student_id :selected').text() 
    escaped_student = student.replace(/([ #;&,.+*~\':"!^$[\]()=>|\/@])/g, '\\$1') 
    options = $(lessons).filter("optgroup[label='#{escaped_student}']").html() 
    if options 
     $('#exam_registration_lesson_id').html(options) 
     $('#exam_registration_lesson_id').parent().show() 
    else 
     $('#exam_registration_lesson_id').empty() 

पुनः आरंभ सर्वर और मेनू काम !