request.rb

  # Time specifications:
  validates_each :assembly_time2 do |record, attr, value|
    next if value.nil?
    # Leave this up to other validation
    next if record.assembly_time1.nil?
    if value < ( record.assembly_time1 + 1.hour + 15.minutes )
      record.errors.add attr, "must allow for at least one hour assembly and 15 minute break"
    end
  end
  validates_each :assembly_time3 do |record, attr, value|
    next if value.nil?
    # Leave this up to other validation
    next if record.assembly_time2.nil?
    if value < ( record.assembly_time2 + 1.hour + 15.minutes )
      record.errors.add attr, "must allow for at least one hour assembly and 15 minute break"
    end
  end
  validates_each :assembly_time1 do |record, attr, value|
    next if value.nil?
    # Must be later than 9:30
    if (value.hour < 9) || (value.hour == 9 && value.min < 30 )
      record.errors.add attr, "must be no earlier than 9:30am"
    end
  end