I've found the solution:

class ProjectReport < ActiveRecord::Base
  def total_hours
    @attributes['total_hours']
  end

  def group_name
    @attributes['group_name']
  end

  def project_type
    @attributes['project_type']
  end

  def request_type
    @attributes['request_type']
  end
end

So I can access results from find_by_sql using something like
'accessors'.

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