When ActiveRecord does not find a record

In Rails, when ActiveRecord does not find a record with the specified ID raises and exception. A good way to control this exception is to intercept it and respond with an appropriate HTTP status code, in this case a 404. This is a simple example:

	begin
	p = Participant.find params[:id]
	render :nothing => true, :status => 200
	rescue
	render :nothing => true, :status => 404
	end

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