Initialization error with mongoid-3.1.0

[pmor]

I just updated do mongoid-3.1.0 and I get this error on any state_machine I try to create. Classes without state_machine are working fine.

Exception: NoMethodError: undefined method `[]=' for nil:NilClass
--
0: [...]/mongoid-3.1.0/lib/mongoid/attributes.rb:171:in `block in write_attribute'
1: [...]/mongoid-3.1.0/lib/mongoid/threaded/lifecycle.rb:26:in `_assigning'
2: [...]/mongoid-3.1.0/lib/mongoid/attributes.rb:169:in `write_attribute'
3: [...]/mongoid-3.1.0/lib/mongoid/fields.rb:436:in `block (2 levels) in create_field_setter'
4: [...]/state_machine-1.1.2/lib/state_machine/machine.rb:1097:in `write'
5: [...]/state_machine-1.1.2/lib/state_machine/machine.rb:695:in `initialize_state'
6: [...]/state_machine-1.1.2/lib/state_machine/machine_collection.rb:31:in `block in initialize_states'
7: [...]/state_machine-1.1.2/lib/state_machine/machine_collection.rb:30:in `each_value'
8: [...]/state_machine-1.1.2/lib/state_machine/machine_collection.rb:30:in `initialize_states'
9: [...]/state_machine-1.1.2/lib/state_machine/integrations/mongoid.rb:375:in `initialize'

The exception is thrown here (/mongoid-3.1.0/lib/mongoid/attributes.rb:171:in `block in write_attribute')

attributes_before_type_cast[name.to_s] = value

because attributes_before_type_cast is nil

[pmor]

Also opened issue in mongoid: https://github.com/mongoid/mongoid/issues/2827

[obrie]

Thanks for reporting this! I've made a change to the Mongoid integration which will prevent issues like this from cropping up in the future -- this will make state_machine work on the unpatched version of Mongoid 3.1.0.

[pmor]

:thumbsup: Great!