Fixing errors with state_machine when excluding states

This is for you if you get the following strange error from the state_machine gem Show archive.org snapshot :

undefined method `-' for #<StateMachine::BlacklistMatcher:0x124769b0>

You probably did something like this in your state_machine ... do block:

def self.final_states
  [ :foo, :bar ]
end

transition (all - machine.final_states - [:baz]) => :target_state

Instead, define the source states like this:

def self.final_states
  [ :foo, :bar ]
end

transition (all - (machine.final_states | [:baz])) => :target_state

Arne Hartherz

Last edit

2013-01-26

License

Source code in this card is licensed under the MIT License.

Posted by Arne Hartherz to makandra dev (2012-10-15 08:54)