module AASM::Persistence::RedisPersistence::InstanceMethods

def aasm_ensure_initial_state


foo.aasm_state # => nil
foo.valid?
foo.aasm_state = nil
foo.aasm_state # => 1
foo = Foo.find(:first)


foo.aasm_state # => "open" (where :open is the initial state)
foo.valid?
foo.aasm_state # => nil
foo = Foo.new

that the initial state gets populated before validation on create
Ensures that if the aasm_state column is nil and the record is new 
def aasm_ensure_initial_state
  AASM::StateMachineStore.fetch(self.class, true).machine_names.each do |name|
    aasm_column = self.class.aasm(name).attribute_name
    aasm(name).enter_initial_state if !send(aasm_column).value || send(aasm_column).value.empty?
  end
end

def aasm_read_state(name=:default)

This allows for nil aasm states - be sure to add validation to your model

NOTE: intended to be called from an event

foo.current_state # => nil
foo.aasm_state = nil
foo.current_state # => :opened
foo = Foo[1]

foo.current_state # => :closed
foo.close
foo.current_state # => :opened
foo = Foo.new

end
end
state :closed
state :opened
aasm :column => :status do
include AASM
include Redis::Objects
class Foo

If it's a new record, and the aasm state column is blank it returns the initial state

Returns the value of the aasm.attribute_name - called from aasm.current_state 
def aasm_read_state(name=:default)
  state = send(self.class.aasm(name).attribute_name)
  if state.value.nil?
    nil
  else
    state.value.to_sym
  end
end

def aasm_write_state(state, name=:default)

NOTE: intended to be called from an event

Foo[1].aasm.current_state # => :closed
foo.aasm.current_state # => :closed
foo.close!
foo.aasm.current_state # => :opened
foo = Foo[1]

Writes state to the state column and persists it to the database 
def aasm_write_state(state, name=:default)
  aasm_column = self.class.aasm(name).attribute_name
  send("#{aasm_column}").value = state
end

def aasm_write_state_without_persistence(state, name=:default)

NOTE: intended to be called from an event

Foo[1].aasm.current_state # => :closed
foo.aasm.current_state # => :closed
foo.save
Foo[1].aasm.current_state # => :opened
foo.aasm.current_state # => :closed
foo.close
foo.aasm.current_state # => :opened
foo = Foo[1]

it does not operate like an AR model and does not know how to postpone changes.
With Redis::Objects it's not possible to skip persisting - it's not an ORM,

(but actually it still does)
Writes state to the state column, but does not persist it to the database 
def aasm_write_state_without_persistence(state, name=:default)
  aasm_write_state(state, name)
end

def initialize(*args)

Redis::Objects removes the key from Redis when set to `nil`

Initialize with default values 
def initialize(*args)
  super
  aasm_ensure_initial_state
end