Rails add one to increment SQL value

Question

I am trying to add one to the already incremented field in the DB, but I am getting the following error: NoMethodError (undefined method+' for false:FalseClass):`

Code:

med = Media.find(params[:media_id])
med.update_attributes({:screener_viewed => med.screener_viewed + 1})

I am just wanting to add 1 to the current value of screener_viewed, but can't get it to work.

Working Code:

Media.increment_counter(:screener_viewed, params[:media_id])

Answer 1

Use increment!:

med.increment!(:screener_viewed)

Make sure that screener_viewed is of type integer in your db.