before_validation issues with rails -

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the problem using 

def before_validation   self.author.strip!   self.author_email.strip! end

and error message:

deprecation warning: base#before_validation has been deprecated, please use base.before_validation :method instead.

can point me in right direction. thanks

somewhere toward top of class model place name of clean-up method:

before_validation :remove_whitespace

... , further down model class place private method same name:

def remove_whitespace   self.author.strip!   self.author_email.strip! end

optionally, if want one-liner, pass lambda instead of method name before_validation:

before_validation lambda {self.author.strip!; self.author_email.strip!}

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