tags: #events

events¶

NorthConf, a made-up two-day tech conference, as a domain model: the event and its venue, the programme, the people, tickets, and what happens on the day. Its sample data is in events-samples; the flows (registrations, the double-booking guard, payments, reminders, check-in, feedback) are in the events-… topics, explained in FlowsGuide.

Conventions (d2 class syntax): X* is a list, <>X / <>X* a reference by key, a bare X is containment (a class with no @key is kept inside its owner). @label marks the display field, ? an optional field, @calc(…) a field worked out from the others.

The event¶

$class Event (
  @key id: String,
  @label name: String,
  venue: <>Venue,
  starts: Date,
  ends: Date,
  status: String,
  capacity: Number,
  registered: Number,
  @calc(capacity - registered) seatsLeft: Number,
) @group("Event")

$class Room (
  @label name: String,
  capacity: Number,
) @group("Event")

$class Venue (
  @key id: String,
  @label name: String,
  city: String,
  rooms: Room*,
) @group("Event")

$class Track (
  @key id: String,
  @label name: String,
  colour: String,
) @group("Event")

$class Session (
  @key id: String,
  event: <>Event,
  @label title: String,
  room: String,
  track: <>Track,
  start: Date,
  end: Date,
  speakers: <>Speaker*,
  status: String,
) @group("Event")

$class Speaker (
  @key id: String,
  @label name: String,
  email: String,
  bio: String,
) @group("Event")

$class Sponsor (
  @key id: String,
  @label name: String,
  level: String,
) @group("Event")

People¶

$class Attendee (
  @key id: String,
  @label name: String,
  email: String,
) @group("People")

$class Organizer (
  @key id: String,
  @label name: String,
  email: String,
) @group("People")

$class Shift (
  role: String,
  start: Date,
  end: Date,
) @group("People")

$class Volunteer (
  @key id: String,
  @label name: String,
  email: String,
  shifts: Shift*,
) @group("People")

Tickets¶

$class TicketType (
  @key id: String,
  event: <>Event,
  @label name: String,
  price: Number,
  capacity: Number,
  sold: Number,
  status: String,
  @calc(capacity - sold) remaining: Number,
) @group("Tickets")

$class Registration (
  @key id: String,
  attendee: <>Attendee,
  ticketType: <>TicketType,
  status: String,
  discount: <>Discount?,
) @group("Tickets")

$class Payment (
  @key id: String,
  registration: <>Registration,
  amount: Number,
  method: String,
) @group("Tickets")

$class Discount (
  @key code: String,
  pct: Number,
) @group("Tickets")

$class Invoice (
  @key number: String,
  registration: <>Registration,
  amount: Number,
  issued: Date,
) @group("Tickets")

On the day¶

$class CheckIn (
  @key id: String,
  registration: <>Registration,
  session: <>Session?,
  at: Date,
) @group("On the day")

$class Feedback (
  @key id: String,
  session: <>Session,
  attendee: <>Attendee,
  stars: Number,
  @label text: String,
) @group("On the day")

$class Announcement (
  @key id: String,
  event: <>Event,
  @label text: String,
  at: Date,
) @group("On the day")

$class Badge (
  @key id: String,
  registration: <>Registration,
  @label name: String,
  printed: Boolean,
) @group("On the day")

The outbox¶

Every message the flows send goes through events.notify (events-notify), which keeps it here, so you can see what would go out and to whom.

$class Message (
  @key id: String,
  to: String,
  @label text: String,
  at: Date,
) @group("Outbox")

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