ruby-on-rails - Heroku 只有 : ancestry gem crashes with undefined method `ancestry' for #

Question

我在 Heroku 上只看到了祖先 gem 的问题(无法在本地复制):
https://github.com/stefankroes/ancestry

home#upload 中发生 NoMethodError:
#的未定义方法`祖先'

方法如下所示:

def anthem_upload
    user = User.find_by(id: params[:user_id])
    anthem = Anthem.create!(user_id: user.id, body:params[:post]) <-- HAPPENS HERE
   ...
ene

此方法甚至不调用 .ancestry 方法 - 但一旦创建模型就会发生异常。

模型看起来像这样:

class Anthem < ActiveRecord::Base
  has_ancestry
 ...
end

这是日志:

A NoMethodError occurred in home#anthem_upload:

  undefined method `ancestry' for #<Anthem:0x007f1684d58b98>
  app/controllers/home_controller.rb:335:in `anthem_upload'

Answer 1

您必须运行迁移才能添加方法 ancestry到您的模型:

 heroku run rake db:migrate

当然，假设您的应用程序在开发中工作。如果没有，您可以生成迁移

rails g migration add_ancestry_to_[table] ancestry:string

取自 ancestry

已编辑

阅读您的评论后，我确实尝试了我的假设。添加 ancestry gem 到一个不需要的项目，然后他们添加 has_ancestry到模型 Task ，没有迁移，在控制台我得到:

Loading development environment (Rails 4.2.2)
~/ (development) > Task.new
=> #<Task:0x00000008a3d088> {
               :id => nil,
       :project_id => nil,
             :name => nil,
      :description => nil,
    :points_budget => nil,
       :created_at => nil,
       :updated_at => nil
}
~/ (development) > Task.new.save
   (0.2ms)  BEGIN
   (0.2ms)  ROLLBACK
NoMethodError: undefined method `ancestry' for #<Task:0x00000008a9c998>
from /home/alejandro/.rvm/gems/ruby-2.2.2@rails4/gems/activemodel-4.2.2/lib/active_model/attribute_methods.rb:433:in `method_missing'
~/ (development) > Task.new.validate
NoMethodError: undefined method `ancestry' for #<Task:0x00000008ad1210>
from /home/alejandro/.rvm/gems/ruby-2.2.2@rails4/gems/activemodel-4.2.2/lib/active_model/attribute_methods.rb:433:in `method_missing'

你得到了同样的错误。当然，我正在开发中。你必须在 heroku 上尝试这样的事情: heroku run rails console