Robert Walker wrote in post #1142180:
> The documentation contains your answer:
>
> 
http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-text_area

In case you didn't get that here's an example:

<%= f.text_area :description, { id: "my_description" } %>
=> <textarea id="my_description" name="person[description]"></textarea>

If you wan't to override any of the defaults you can pass what you want 
in the "options" hash.

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