say i have five columns of type integer like: age, book_number,
page_number, number_of_pages, number_of_people
and instead of doing this
validate_numericality_of :age, :book_number, :page_number,
:number_of_pages, :number_of_people
I want to name all columns that are of type integer to an array and for
every element of that array validate if its a number or not
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