グループ招待の通知とか

Resolve #5880
Resolve #5927

src/models/repositories/user-group-invitation.ts

@@ -0,0 +1,24 @@
+import { EntityRepository, Repository } from 'typeorm';
+import { UserGroupInvitation } from '../entities/user-group-invitation';
+import { UserGroups } from '..';
+import { ensure } from '../../prelude/ensure';
+
+@EntityRepository(UserGroupInvitation)
+export class UserGroupInvitationRepository extends Repository<UserGroupInvitation> {
+	public async pack(
+		src: UserGroupInvitation['id'] | UserGroupInvitation,
+	) {
+		const invitation = typeof src === 'object' ? src : await this.findOne(src).then(ensure);
+
+		return {
+			id: invitation.id,
+			group: await UserGroups.pack(invitation.userGroup || invitation.userGroupId),
+		};
+	}
+
+	public packMany(
+		invitations: any[],
+	) {
+		return Promise.all(invitations.map(x => this.pack(x)));
+	}
+}