ROR:工作流gem:我想从数据库实现动态状态 [英] ROR : Workflow gem : I want to implement dynamic states from database

问题描述

我目前正在从事一个必须实现动态工作流程的项目.

I am currrently working on a project that has to implement dynamic workflow.

动态:我将工作流的状态存储在名为 wf_steps 的数据库表中，工作流gem必须从数据库中为特定工作流创建states

Dynamic: I store workflow's states in database table called wf_steps and the workflow gem has to create states for a particular workflow from the database

为此，我正在尝试使用工作流gem .您可以在gem的github页上查看它如何初始化状态和相应的事件.

For that I am trying to use the workflow gem. You can see how it initializes states and corresponding events in the gem's github-page.

我的代码:

class SpsWorkflow < ActiveRecord::Base
  belongs_to :user
  has_many :wf_steps
  include Workflow
  workflow do
    # binding.pry
    # read wf-states from the database
    # for now let event be same for all the states
    self.wf_steps.each do |step|
      state step.title.to_sym do
        event :assign, transitions_to: :assigning
        event :hire, transitions_to: :hiring
        event :not_hire, transitions_to: :not_hiring
      end
    end
  end
end

遇到的期望和问题:

我期望在代码块中，术语self.wf_steps下的项将返回我的SpsWorkflow的实例/集合.但是，当我在workflow方法的代码块中使用binding.pry时，self关键字返回#<Workflow::Specification:0x000000063e23e8 @meta={}, @states={}>(在代码中已注释)

I expected in the code block below the term self.wf_steps would return my SpsWorkflow's instance/collection. However the self keyword returns #<Workflow::Specification:0x000000063e23e8 @meta={}, @states={}> when I use binding.pry inside the workflow method's block ( I commented in the code )

# read wf-states from the database
# for now let event be same for all the states
  self.wf_steps.each do |step|
    state step.title.to_sym do

需要您的帮助，谢谢

我还尝试将实例存储在变量中，并在传递给workflow方法调用的块中使用变量.

I also tried storing the instance in a variable and using the variable inside the block passing to the workflow method call.

class SpsWorkflow < ActiveRecord::Base
  include Workflow
  sps_instance = self

但是我得到了类SpsWorkflow的实例，

But I got the instance of the class SpsWorkflow like

SpsWorkflow(id: integer, workflow_state: string, assigned_to: integer, title: string, description: string, organization_id: integer, user_id: integer, created_at: datetime, updated_at: datetime)

但我想要

 #<SpsWorkflow id: 1, workflow_state: "step1", assigned_to: nil, title: "Software Engineer", description: "Hire best engineer", organization_id: nil, user_id: 1, created_at: "2015-08-08 00:58:12", updated_at: "2015-08-08 00:58:12">

推荐答案

我终于使用activerecord回调解决了它

I finally solved it using a activerecord callback

class SpsWorkflow < ActiveRecord::Base
  include Workflow
  after_initialize do
    sps_instance = self
    SpsWorkflow.workflow do
      # read wf-states as well as events from the database
      sps_instance.wf_steps.each do |step|
        state step.title.to_sym do
          event :assign, transitions_to: :step2
          event :hire, transitions_to: :hire
          event :not_hire, transitions_to: :not_hiring
        end
      end
    end
  end
  belongs_to :user
  has_many :wf_steps
end

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