@wearesage/schema/examples/rbac/GroupMembership.ts

A flexible schema definition and validation system for TypeScript with multi-database support

import "reflect-metadata";
import { Entity, Id, Property, ManyToOne } from "../..";
import { User } from "./User";
import { Group } from "./Group";

/**
 * A pivot (linking) entity to connect a User to a Group.
 * This is often more flexible than a simple ManyToMany in some DB abstractions,
 * because you can store extra fields on the membership itself
 * (like "joinedAt", "roleInGroup", etc.).
 */
@Entity()
export class GroupMembership {
  @Id()
  id: string;

  @Property({ default: () => new Date() })
  joinedAt: Date;

  @ManyToOne({
    target: () => User,
    inverse: "memberships",
    name: "MEMBERSHIP_FOR_USER",
  })
  user: User;

  @ManyToOne({
    target: () => Group,
    inverse: "memberships",
    name: "MEMBERSHIP_IN_GROUP",
  })
  group: Group;
}