diff options
Diffstat (limited to 'activemodel/lib/active_model/state_machine.rb')
| -rw-r--r-- | activemodel/lib/active_model/state_machine.rb | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/state_machine.rb b/activemodel/lib/active_model/state_machine.rb new file mode 100644 index 0000000000..96df6539ae --- /dev/null +++ b/activemodel/lib/active_model/state_machine.rb @@ -0,0 +1,66 @@ +Dir[File.dirname(__FILE__) + "/state_machine/*.rb"].sort.each do |path| + filename = File.basename(path) + require "active_model/state_machine/#{filename}" +end + +module ActiveModel + module StateMachine + class InvalidTransition < Exception + end + + def self.included(base) + base.extend ClassMethods + end + + module ClassMethods + def inherited(klass) + super + klass.state_machines = state_machines + end + + def state_machines + @state_machines ||= {} + end + + def state_machines=(value) + @state_machines = value ? value.dup : nil + end + + def state_machine(name = nil, options = {}, &block) + if name.is_a?(Hash) + options = name + name = nil + end + name ||= :default + state_machines[name] ||= Machine.new(self, name) + block ? state_machines[name].update(options, &block) : state_machines[name] + end + end + + def current_state(name = nil, new_state = nil, persist = false) + sm = self.class.state_machine(name) + ivar = sm.current_state_variable + if name && new_state + if persist && respond_to?(:write_state) + write_state(sm, new_state) + end + + if respond_to?(:write_state_without_persistence) + write_state_without_persistence(sm, new_state) + end + + instance_variable_set(ivar, new_state) + else + instance_variable_set(ivar, nil) unless instance_variable_defined?(ivar) + value = instance_variable_get(ivar) + return value if value + + if respond_to?(:read_state) + value = instance_variable_set(ivar, read_state(sm)) + end + + value || sm.initial_state + end + end + end +end
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