Class: FlowEngine::Transition

Inherits:
Object
  • Object
show all
Defined in:
lib/flowengine/transition.rb

Overview

A single edge from one step to another, optionally guarded by a rule. Transitions are evaluated in order; the first whose rule is true determines the next step.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(target:, rule: nil) ⇒ Transition 



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# File 'lib/flowengine/transition.rb', line 14

def initialize(target:, rule: nil)
  @target = target
  @rule = rule
  freeze
end

Instance Attribute Details

#rule ⇒ Rules::Base? (readonly)

condition; nil means unconditional (always applies)



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# File 'lib/flowengine/transition.rb', line 9

def rule
  @rule
end

#target ⇒ Symbol (readonly)

id of the step to go to when this transition applies



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# File 'lib/flowengine/transition.rb', line 9

def target
  @target
end

Instance Method Details

#applies?(answers) ⇒ Boolean

Whether this transition should be taken given current answers.



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# File 'lib/flowengine/transition.rb', line 31

def applies?(answers)
  return true if rule.nil?

  rule.evaluate(answers)
end

#condition_label ⇒ String

Human-readable label for the condition (e.g. for graph export).



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# File 'lib/flowengine/transition.rb', line 23

def condition_label
  rule ? rule.to_s : "always"
end