Added relations for participants

ref #11

src/models/Address.ts

@@ -1,4 +1,4 @@
-import { Entity, PrimaryGeneratedColumn, Column } from "typeorm";
+import { Entity, PrimaryGeneratedColumn, Column, OneToMany } from "typeorm";
 import {
   IsInt,
   IsNotEmpty,
@@ -6,6 +6,7 @@ import {
   IsPostalCode,
   IsString,
 } from "class-validator";
+import { Participant } from "./Participant";
 
 /**
  * Defines a address (to be used for contact information).
@@ -70,4 +71,10 @@ export class Address {
   @IsString()
   @IsNotEmpty()
   country: string;
+
+  /**
+   * Used to link the address to participants.
+   */
+  @OneToMany(() => Participant, participant => participant.address)
+  participants: Participant[];
 }