我想通过Activeadmin的formtastic制作动态选择选项,如下所示：
form do |f|
f.inputs "Exam Registration Details" do
f.input :user_id,:as => :select,:collection => User.where(:admin => 'false')
#selects user from list. WORKING
f.input :student_id,:collection => Student.joins(lessons: :user)
#collection of students will change to students who have lessons with chosen user. NOT WORKING,returns all students who have lessons.
f.input :lesson_id,:collection => Lesson.joins(:student,:user)
#collection of lessons will change to reflect lessons connected by chosen user and student. NOT WORKING,returns all lessons.
end
f.buttons
end
我的业余代码显然不能像我预期的那样工作.我应该做些什么改变？
我有4个型号如下：
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 class ExamRegistration < ActiveRecord::Base has_many :lessons has_many :users,through: :lessons has_many :students,through: :lessons
解决方法
解决了
对于其他遇到同样问题的人,请看这个railscast
这是我如何在activeadmin中实现多个动态选择菜单：
配置/初始化/ active_admin.rb
config.register_javascript 'exam_registrations.js.coffee'
应用程序/管理/ exam_registrations.rb
form do |f|
f.inputs "Exam Registration Details" do
f.input :user_id,:label => 'Teacher',:collection => User.where(:admin => 'false',:active => true).order(:name),:include_blank => true
f.input :student_id,:hint => 'Students grouped by teacher names',:collection => option_groups_from_collection_for_select(User.where(:admin => false,:students,:name,:id,:name)
f.input :lesson_id,:hint => 'Lessons grouped by student names',:collection => option_groups_from_collection_for_select(Student.where(:active => true).order(:name),:lessons,:name)
end
f.buttons
end
应用程序/资产/ JavaScript的/ 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(/([ #;&,'\\$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()
重启服务器,菜单工作！