Question

当我尝试通过ActiveAdmin的信息中心查看两个特定模型时，我收到以下错误。我读过的所有内容都指向可能的关联问题，但我不确定如何纠正它。我看到很多人都遇到了同样的问题，但没有找到任何解决方案。任何帮助将非常感激。

NoMethodError in Admin::Listings#index
undefined method `klass' for nil:NilClass

或

NoMethodError in Admin::Buildings#index
undefined method `klass' for nil:NilClass

模型

class Company < ApplicationRecord
  has_many :appointments, through: :listings, dependent: :destroy
  has_many :listings, through: :users, dependent: :destroy
  has_many :buildings, through: :users, dependent: :destroy
  has_many :users, dependent: :destroy
end

class User < ApplicationRecord
  belongs_to :company
  has_many :apointments, through: :listings
  has_many :listings, through: :buildings
  has_many :buildings
end

class Listing < ApplicationRecord
  has_many :companies, through: :users
  has_many :users, through: :buildings
  belongs_to :building
  has_many :appointments
end

class Building < ApplicationRecord
  has_many :companies, through: :users
  belongs_to :user
  has_many :appointments, through: :listings
  has_many :listings, dependent: :destroy
end


class Appointment < ApplicationRecord
  belongs_to :listing
  has_many :companies, through: :listings 
end

Answer 1

我认为你在has_many :apointments, through: :lisings

中有拼写错误

尝试使用has_many :appointments, through: :listings

你缺少p而缺少t

没有解决方案，但https://github.com/activeadmin/activeadmin/issues/4470也是您的问题。

另一个想法：

在具有belong_to的模型上，您将该关联用于直通，请尝试将其更改为单数。例如：

class Appointment < ApplicationRecord belongs_to :listing has_many :companies, through: :listing # nb: singular here end

也许那会有帮助吗？

Rails 5.1 ActiveAdmin错误未定义方法`klass＆＃39;为零：NilClass

1 个答案: