Add unique index

migration/1558266512381-UserListJoining.ts

@@ -0,0 +1,13 @@
+import {MigrationInterface, QueryRunner} from "typeorm";
+
+export class UserListJoining1558266512381 implements MigrationInterface {
+
+    public async up(queryRunner: QueryRunner): Promise<any> {
+        await queryRunner.query(`CREATE UNIQUE INDEX "IDX_90f7da835e4c10aca6853621e1" ON "user_list_joining" ("userId", "userListId") `);
+    }
+
+    public async down(queryRunner: QueryRunner): Promise<any> {
+        await queryRunner.query(`DROP INDEX "IDX_90f7da835e4c10aca6853621e1"`);
+    }
+
+}

src/models/entities/user-list-joining.ts

@@ -4,6 +4,7 @@ import { UserList } from './user-list';
 import { id } from '../id';
 
 @Entity()
+@Index(['userId', 'userListId'], { unique: true })
 export class UserListJoining {
 	@PrimaryColumn(id())
 	public id: string;