ROR : Workflow gem : I want to implement dynamic states from database - ruby-on-rails

Question

I am currrently working on a project that has to implement dynamic workflow.
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
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.
My code:
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
Expectation and Problem encountered:
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
Need you help, thanks
EDIT:
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
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)
but I want
#<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">

Answer 1

You have used:
workflow do
self.something
end
self in the context of this block will refer to the WorkflowSpecification. If you really want access to the instance of SpsWorkflow, you may have to pass it into the block or assign it to a different variable and use it there.

Answer 2

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