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42 lines
887 B
Markdown
42 lines
887 B
Markdown
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# How to migrate from AASM version 3 to 4?
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## callback arguments
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On one hand, when using callbacks like this
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```ruby
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class MyClass
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aasm do
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...
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event :close, :before => :before do
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transitions :to => :closed, :from => :open, :on_transition => :transition_proc
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end
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end
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def transition_proc(arg1, arg2); end
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def before(arg1, arg2); end
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...
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end
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```
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you don't have to provide the target state as first argument anymore. So, instead of
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```ruby
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my_class = MyClass.new
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my_class.close(:closed, arg1, arg2)
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```
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you can leave that away now
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```ruby
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my_class.close(arg1, args)
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```
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On the other hand, you have to accept the arguments for **all** callback methods (and procs)
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you provide and use. If you don't want to provide these, you can splat them
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```ruby
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def before(*args); end
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# or
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def before(*_); end # to indicate that you don't want to use the arguments
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```
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