Loading an image to instance variable of AR


I would like to load an image (not uploading from the client) and store
this image as an instance variable of my model ?
I do that because I want to render it with
send_data(Person.defaultImage, :type => “image/jpeg”, :disposition

This is the code I did in my model, that not works ;-(, no error, but
the image is not render wth the send_data

def defaultImage
file=File.open("#{RAILS_ROOT}/public/images/picture.jpg", “r”)
file.each_byte do |abyte|
@waitingImage << abyte
return @waitingImage


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