Heroku only:祖先的宝石崩溃与未定义的方法`ancestry'##Model:0x #######>

Question

我在Heroku上看到的问题只有祖先宝石(无法在本地重现):https: //github.com/stefankroes/ancestry

home#upload中出现NoMethodError:#的未定义方法`ancestry'

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

此方法甚至不会调用.ancestry方法 - 但只要模型创建就会发生异常.

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将该方法添加ancestry到您的模型中：

 heroku run rake db:migrate

当然，假设您的应用程序可以在开发中使用。如果没有，您可以使用以下命令生成迁移

rails g migration add_ancestry_to_[table] ancestry:string

取自祖先

已编辑

读完你的评论后，我确实尝试了我的假设。将 gem添加ancestry到不需要的项目中，并将它们添加has_ancestry到 model 中Task，无需迁移，在我得到的控制台上：

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