title: Brakeman unsafe reflection method constantize called with model attribute
body: <p>In my rails application I am getting the following security warning from brakeman. Unsafe reflection method constantize called with model attribute. Here is what my code is doing.</p>
  
  <pre>
  <code>
  chart_type = Chart.where(
    id: chart_id,
  ).pluck(:type).first
  
  begin
    ChartPresenter.new(chart_type.camelize.constantize.find(chart_id))
  rescue
    raise "Unable to find the chart presenter"
  end
  </code>
  </pre>
  
  <p>From my research I haven't found any concrete solution. I have heard that you can make a whitelist but I am not sure what brakeman is looking for. I tried to create an array and to check against that before calling constantize and breakman still complains. Any help with this would be great. If you feel it's not a needed fix can you give details as to why it shouldn't be a concern?</p>