class ActivityMonth
  def self.validate(row)
    reasons = []

    unless row[:activity_month]
      reasons << 'Activity month is required'
    end

    if row[:activity_month]
      if row[:activity_month].to_i < 1 or row[:activity_month].to_i > 12
        reasons << 'Activity month must be a valid month number'
      end
    end

    reasons
  end
end