Question

我已经通过关联阅读了很多关于使用带有has_many的活动管理员的帖子，但是我没有得到想要的结果。基本上我有两个模型“会议”＆amp; “帐户”。我需要为会议分配多个帐户，为帐户分配多个会议。我使用HABTM或has_many对我来说无关紧要。我只需要在创建新会议时看到下拉选择选项，反之亦然。

帐户模型

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

会议帐户模型

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

我一直收到以下错误

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)>'

我该如何解决这个问题？

感谢。

Answer 1

您是否尝试在会议模型中添加以下行？

# 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：accept nested attributes for has_many relationship

Answer 2

使用has_many through: :some_model时，请务必在:some_model上定义has_many，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

通过Active Admin使用HABTM或Has_many

2 个答案: