Pastable version of Rails DB Field to Image Output and Tag Parsing

<pre class='prettyprint' language='ruby'>def images
  image = Kernel.const_get(params[:class].capitalize).find_by_link(params[:id]).image
  if image.nil?
    redirect_to '/images/blank-photo.gif'
  else
    send_data(image, :type =&gt; 'image/png', :filename =&gt; params[:id] + '.png', :disposition =&gt; 'inline')
  end
end

# This Method is slightly different for each Model. This is from the Person Model.
# It takes the input which would be &quot;jack+smith&quot; for example and compares it to each record in the table with its name value which would actually be &quot;Jack Smith&quot;.
def self.find_by_link input
  find(:all).each do |p|
    if p.link_name == input
      return p
    end
  end
  return nil
end

def link_name
  name.downcase.gsub &quot; &quot;, &quot;-&quot;
end</pre>
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Pastable version of Rails DB Field to Image Output and Tag Parsing