4

我已经阅读了很多关于通过关联将活动管理员与 has_many 一起使用的帖子，但我没有得到想要的结果。本质上，我有 2 个模型“会议”和“帐户”。我需要将多个帐户分配给一个会议并将多个会议分配给一个帐户。无论我使用 HABTM 还是 has_many 对我来说都无关紧要。当我创建一个新会议时，我只需要能够看到一个下拉选择选项，反之亦然。

账户模型

class Account < ActiveRecord::Base
  attr_accessible :address, :city, :name, :phone, :state, :website, :zip
  has_many :contacts, :dependent => :destroy
  has_many :conferences, :through => :conferenceaccount
end

会议模式

class Conference < ActiveRecord::Base
  attr_accessible :address, :city, :conferencename, :eventdateend, :eventdatestart, :industry, :phone, :state, :website
  has_many :accounts, :through => :conferenceaccount
end

会议账户模型

class Conferenceaccount < ActiveRecord::Base
  belongs_to :conference
  belongs_to :account

  attr_accessible :account_id, :conference_id
end

会议管理模式

ActiveAdmin.register Conference do 
  form do |f|
      f.inputs "Details" do # Project's fields
          f.input :conferencename
          f.input :address
          f.input :city
          f.input :state         
          f.input :website
          f.input :phone
          f.input :eventdatestart
          f.input :eventdateend
          f.input :industry         
      end
      f.has_many :conferenceaccounts do |app_f|
         app_f.inputs "Conferences" do
           if !app_f.object.nil?
             # show the destroy checkbox only if it is an existing appointment
             # else, there's already dynamic JS to add / remove new appointments
             app_f.input :_destroy, :as => :boolean, :label => "Destroy?"
           end

           app_f.input :account # it should automatically generate a drop-down select to choose from your existing patients
         end
       end      
      f.buttons
  end
end

我不断收到以下错误

ActionView::Template::Error (undefined method `klass' for nil:NilClass):
    1: insert_tag renderer_for(:new)
  app/admin/conferences.rb:14:in `block (2 levels) in <top (required)>'

我怎样才能解决这个问题？

谢谢。

4

2 回答 2

4

您是否尝试将以下行添加到您的会议模型中？

# conference.rb
attr_accessible : conferenceaccounts_attributes
has_many :conferenceaccounts

# This line after your your relations
accepts_nested_attributes_for : conferenceaccounts, :allow_destroy => true

请参阅：接受 has_many 关系的嵌套属性

于 2013-05-08T05:27:52.673 回答
1

使用时has_many through: :some_model，请确保同时定义 has_many :some_model，例如：

如果你有：

class Account < ActiveRecord::Base
  has_many :conferences, :through => :conferenceaccount
end

将其转换为：

class Account < ActiveRecord::Base
  has_many :conferences, :through => :conferenceaccount
  has_many :conferenceaccount                              # <- added
end
于 2014-12-08T00:42:49.520 回答