Module: Workflow
- Defined in:
- lib/workflow.rb
Overview
See also README.markdown for documentation
Defined Under Namespace
Modules: ActiveRecordInstanceMethods, RemodelInstanceMethods, WorkflowClassMethods, WorkflowInstanceMethods Classes: Event, NoTransitionAllowed, Specification, State, TransitionHalted, WorkflowDefinitionError, WorkflowError
Class Method Summary
-
+ (Object) create_workflow_diagram(klass, target_dir = '.', graph_options = 'rankdir="LR", size="7,11.6", ratio="fill"')
Generates a `dot` graph of the workflow.
- + (Object) included(klass)
Class Method Details
+ (Object) create_workflow_diagram(klass, target_dir = '.', graph_options = 'rankdir="LR", size="7,11.6", ratio="fill"')
Generates a `dot` graph of the workflow. Prerequisite: the `dot` binary. (Download from www.graphviz.org/) You can use this method in your own Rakefile like this:
namespace :doc do desc "Generate a graph of the workflow." task :workflow => :environment do # needs access to the Rails environment Workflow::create_workflow_diagram(Order) end end
You can influence the placement of nodes by specifying additional meta information in your states and transition descriptions. You can assign higher `doc_weight` value to the typical transitions in your workflow. All other states and transitions will be arranged around that main line. See also `weight` in the graphviz documentation. Example:
state :new do event :approve, :transitions_to => :approved, :meta => {:doc_weight => 8} end
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# File 'lib/workflow.rb', line 366 def self.create_workflow_diagram(klass, target_dir='.', ='rankdir="LR", size="7,11.6", ratio="fill"') workflow_name = "#{klass.name.tableize}_workflow".gsub('/', '_') fname = File.join(target_dir, "generated_#{workflow_name}") File.open("#{fname}.dot", 'w') do |file| file.puts %Q| digraph #{workflow_name} { graph [#{graph_options}]; node [shape=box]; edge [len=1]; | klass.workflow_spec.states.each do |state_name, state| file.puts %Q{ #{state.name} [label="#{state.name}"];} state.events.each do |event_name, event| = event. if [:doc_weight] weight_prop = ", weight=#{meta_info[:doc_weight]}" else weight_prop = '' end file.puts %Q{ #{state.name} -> #{event.transitions_to} [label="#{event_name.to_s.humanize}" #{weight_prop}];} end end file.puts "}" file.puts end `dot -Tpdf -o'#{fname}.pdf' '#{fname}.dot'` puts " Please run the following to open the generated file: open '#{fname}.pdf' " end |
+ (Object) included(klass)
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# File 'lib/workflow.rb', line 325 def self.included(klass) klass.send :include, WorkflowInstanceMethods klass.extend WorkflowClassMethods if Object.const_defined?(:ActiveRecord) if klass < ActiveRecord::Base klass.send :include, ActiveRecordInstanceMethods klass.before_validation :write_initial_state end elsif Object.const_defined?(:Remodel) if klass < Remodel::Entity klass.send :include, RemodelInstanceMethods end end end |