Counting and displaying word count from user-input in ruby

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Ruby

Hello,

I am currently doing an assignment with dynamic pages,
I have one dynamic page for rating courses, in which i had to restrict the comment box to 25 characters and also find a way to count the number of words input by the user giving a rating.

I have figured out how to restrict to 25 characters in my comment.rb file but i am completely lost how to capture the user input word count?

I assume its coding needed in my html.erb and controller file?

Thanks

What I have tried:

##code used for my character restriction
validates :comment, :presence => true, :length => {
:maximum => 25,
:too_long => ":Please limit your commentary to a maximum of %{count} characters, thank you."