class String

def classify

'posts'.classify # => "Post"
'ham_and_eggs'.classify # => "HamAndEgg"

follow +classify+ with +constantize+.)
Note that this returns a string and not a class. (To convert to an actual class
Creates a class name from a plural table name like Rails does for table names to models. 
def classify
  ActiveSupport::Inflector.classify(self)
end