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transitions.rb
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transitions.rb
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# Copyright (c) 2009 Rick Olson
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
module ActiveModel
module Transitions
extend ActiveSupport::Concern
included do
include ::Transitions
after_initialize :set_initial_state
validates_presence_of :state
validate :state_inclusion
end
# The optional options argument is passed to find when reloading so you may
# do e.g. record.reload(:lock => true) to reload the same record with an
# exclusive row lock.
def reload(options = nil)
super.tap do
self.class.state_machines.values.each do |sm|
remove_instance_variable(sm.current_state_variable) if instance_variable_defined?(sm.current_state_variable)
end
end
end
protected
def write_state(state_machine, state)
prev_state = current_state(state_machine.name)
write_state_without_persistence(state_machine, state)
save!
rescue ActiveRecord::RecordInvalid
write_state_without_persistence(state_machine, prev_state)
raise
end
def write_state_without_persistence(state_machine, state)
ivar = state_machine.current_state_variable
instance_variable_set(ivar, state)
self.state = state.to_s
end
def read_state(state_machine)
self.state && self.state.to_sym
end
def set_initial_state
self.state ||= self.class.state_machine.initial_state.to_s if self.has_attribute?(:state)
end
def state_inclusion
unless self.class.state_machine.states.map{|s| s.name.to_s }.include?(self.state.to_s)
self.errors.add(:state, :inclusion, :value => self.state)
end
end
end
end