Move a Lesson’s Time
There are two different moves, done on two different screens:
| You want to change | Where | What moves |
|---|---|---|
| The standing weekly slot for the rest of the semester | Schedule grid, Edit mode, drag the reservation | The reservation + all its future lessons |
| One week only | Weekly calendar, Edit mode, drag the lesson | That single occurrence |
Moving the standing slot (the reservation)
On /admin/schedule.php, press Edit and drag the reservation’s cell onto
an empty slot — a different time, a different teacher’s column, even a
different location’s column. The drop can’t land on an occupied cell, and a
client-side check refuses drops that would run past the end of the day or
into the next booking.
The server (ReservationManagement::updateReservation) then:
- Validates the destination — the teacher must actually be assigned to that location this semester, and the slot is swept for conflicts before anything is written: against other reservations and hold blocks (teacher-wide, across all locations — a teacher can’t be in two places), and against every future occurrence date, including one-off lessons and hold blocks. The first conflict aborts the whole move with a specific message (“This teacher already has Ana’s weekly slot at 3:00–3:30 pm…”).
- Updates the reservation row (teacher, location, day, time).
- Moves the future lessons, if the reservation is confirmed:
- Same day of week — each future lesson still sitting at the old standing time is updated in place to the new time, so its notes, resources, attendance marks, substitute, and location override all survive.
- Different day of week — the future lessons are regenerated on the new weekday’s active dates. Per-occurrence data on the dropped dates is lost (notes, attendance, substitutes), so prefer same-day moves when a week has history on it.
Two things are always left alone: past lessons stay exactly where they were taught, and weeks that were individually hand-moved (their time no longer matches the standing time) keep their custom time — the move only carries the weeks still following the schedule.
Pending reservations move the same way but have no lessons yet, so only the reservation row changes.
Rescheduling a single week
On /admin/calendar_week.php, press Edit and drag the lesson to an empty
cell. One drag can change the time, the date (within the displayed week), the
teacher, and the location at once:
- Dropped on a different teacher’s column — that teacher becomes the substitute for that week only; the reservation is untouched. Dropping it back on its own teacher’s column clears the substitute.
- Dropped on a different location’s column — recorded as a one-week location override.
- The destination is conflict-checked against whoever ends up teaching; cancelled lessons don’t block a drop (a cancelled slot is free).
A cancelled lesson itself cannot be moved. After a hand-move, the lesson shows a “Time moved from 3:00 pm” note in the calendar — and, as above, it is thereafter excluded from standing-slot moves.
The lesson modal deliberately has no time field: moving is always done by dragging, so there is exactly one way to do it and it is always conflict-checked.