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-rw-r--r--activemodel/lib/active_model/state_machine/machine.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/state_machine/machine.rb b/activemodel/lib/active_model/state_machine/machine.rb
index 58c2f1b200..a5ede021b1 100644
--- a/activemodel/lib/active_model/state_machine/machine.rb
+++ b/activemodel/lib/active_model/state_machine/machine.rb
@@ -4,7 +4,8 @@ require 'active_model/state_machine/event'
module ActiveModel
module StateMachine
class Machine
- attr_accessor :initial_state, :states, :events, :state_index
+ attr_writer :initial_state
+ attr_accessor :states, :events, :state_index
attr_reader :klass, :name
def initialize(klass, name, options = {}, &block)