[英]Rails and the state_machine gem. Using callbacks in namespaced state machines to trigger events in in other machines
Like the title says, I am using the state machine gem to create multiple, namespaced state machines on one model. 就像标题所说的那样,我正在使用状态机gem在一个模型上创建多个命名空间状态机。 When one of my state machines transitions to a specific state, I am trying to use a callback to trigger an event in a separate state machine on that same model but am getting an error. 当我的状态机之一转换为特定状态时,我试图使用回调在同一模型上的单独状态机中触发事件,但出现错误。
https://github.com/pluginaweek/state_machine https://github.com/pluginaweek/state_machine
This is what I am calling: 这就是我所说的:
project.status.complete_first
And this is the error I am getting: 这是我得到的错误:
NoMethodError: undefined method `start_the_second_state_machine' for #<StateMachines::Machine:0x007f9467974b60>
This is a simplified version of my code: 这是我的代码的简化版本:
class Status < ActiveRecord::Base
belongs_to :project
######### First Machine #########
state_machine :first_machine, initial: :first_pending, :namespace => 'first' do
after_transition any => :finished do |transition|
self.start_the_second_state_machine
end
event :complete do
transition first_pending: :finished
end
end
######### Second Machine #########
state_machine :second_machine, initial: :unstarted, :namespace => 'second' do
event :start_the_second_state_machine do
transition unstarted: :started
end
end
end
When I remove the line self.transition_to_creative_brief
, there are no errors and my first_machine object transitions, however I need the event to be called on my second_machine as well. 当我删除self.transition_to_creative_brief
,没有错误,并且first_machine对象进行了转换,但是我也需要在second_machine上调用该事件。 So, I know the issue is with self
and that is is not my status object, but I am not sure how to access that? 因此,我知道问题出在self
,那不是我的身份对象,但是我不确定如何访问它?
Try the following: 请尝试以下操作:
class Status < ActiveRecord::Base
belongs_to :project
######### First Machine #########
state_machine :first_machine, initial: :first_pending, :namespace => 'first' do
after_transition any => :finished do |status, transition|
status.start_the_second_state_machine
end
event :complete do
transition first_pending: :finished
end
end
######### Second Machine #########
state_machine :second_machine, initial: :unstarted, :namespace => 'second' do
event :start_the_second_state_machine do
transition unstarted: :started
end
end
end
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