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