Ruby on Rails

I don't know how to pass many arguments to before_validation hook. I
want to implement the hook on both create and update methods:

before_validation(:on => [:create, :update]) {
// do something
}
But this form of arguments :on => [:create, :update] throws an error:

/active_support/callbacks.rb:403: syntax error, unexpected '[',
expecting tSTRING_CONTENT or tSTRING_DBEG or tSTRING_DVAR or tSTRING_END
... (self.validation_context == :[:create, :update])


This one :on => :create, :update also doesn't work:

syntax error, unexpected ')', expecting tASSOC
before_validation(:on => :create, :update) {


And API has only one example with one argument:

before_validation(:on => :create) do
self.number = number.gsub(/[^0-9]/, "") if
attribute_present?("number")
end

How to pass multiple arguments?

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