[Rails] Gem and/or meta_where problem

I've installed the gem "meta_where" (and it reported back:
"Succeeded") but when I use the example in a search method of a
controller:

Person.where(:some_field.matches => '%something%')

there is an error that it doesn't know the method 'matches', so what
still needs to be done to properly activate the gem and make its
methods available?

Thanks, Barney

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