Flowdock
text_area(object_name, method, options = {}) public

Returns a textarea opening and closing tag set tailored for accessing a specified attribute (identified by method) on an object assigned to the template (identified by object). Additional options on the input tag can be passed as a hash with options.

Example (call, result): 

  text_area("post", "body", "cols" => 20, "rows" => 40)
    <textarea cols="20" rows="40" id="post_body" name="post[body]">
      #{@post.body}
    </textarea>
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March 17, 2015 - (v2.1.0 - v3.2.13)
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defaults to 40 columns, 20 rows

as you can see in InstanceTag