shift_me.rb

user_1 = User.first
user_2 = User.second
manager = Manager.first

# usuario que solicita, el usuario y manager solicitado
# en qué día y qué turno?
Request.new(
  requester_id: user_1.id,
  requested_id: user_2.id,
  type: "user",
  status: "PENDING",
  date_work_shift: "01-10-19",
  requested_shift_id: 1,
  current_shift_id: 3
)

if type == "user" && status == "ACCEPTED"
  # sucede despues
  Request.new(
    requester_id: user_1.id,
    requested_id: manager.id,
    type: "manager",
    status: "PENDING",
    date_work_shift: "01-10-19",
    requested_shift_id: 1,
    current_shift_id: 3
  )
end

schedule_1 = Schedule.new(
  month: "October",
  user_id: 2,
  work_shifts: [
    {
      date: "01-10-19",
      shift_id: 1 # mañana
    },
    {
      date: "02-10-19",
      shift_id: 1 # mañana
    },
    {
      date: "03-10-19",
      shift_id: 2 # tarde
    },
    {
      date: "04-10-19",
      shift_id: 4 # DAY OFF
    }
  ]
)

schedule_1 = user_1.schedules.find_by_month("October")
work_shifts = schedule_1.work_shifts
work_shifts.map! do |work_shift|
  work_shift[:shift_id] = 3 if work_shift[:date] == "01-10-19"
end
schedule_1.update(work_shifts: work_shifts)