From 27d9e8464d06f5a48abea844d7a5c1078f7f1e6d Mon Sep 17 00:00:00 2001
From: Hongbo Wu <hongbo@omnivore.app>
Date: Mon, 5 Dec 2022 12:04:36 +0800
Subject: [PATCH] Add unique constraint on user_id and group_id to
 group_membership table

---
 packages/api/src/entity/groups/group_membership.ts       | 2 ++
 ...0102.do.add_unique_constraint_in_group_membership.sql | 9 +++++++++
 ...02.undo.add_unique_constraint_in_group_membership.sql | 9 +++++++++
 3 files changed, 20 insertions(+)
 create mode 100755 packages/db/migrations/0102.do.add_unique_constraint_in_group_membership.sql
 create mode 100755 packages/db/migrations/0102.undo.add_unique_constraint_in_group_membership.sql

diff --git a/packages/api/src/entity/groups/group_membership.ts b/packages/api/src/entity/groups/group_membership.ts
index 0bfc01c63..4db78bd45 100644
--- a/packages/api/src/entity/groups/group_membership.ts
+++ b/packages/api/src/entity/groups/group_membership.ts
@@ -6,6 +6,7 @@ import {
   ManyToOne,
   OneToOne,
   PrimaryGeneratedColumn,
+  Unique,
   UpdateDateColumn,
 } from 'typeorm'
 
@@ -14,6 +15,7 @@ import { Group } from './group'
 import { Invite } from './invite'
 
 @Entity()
+@Unique('group_membership_unique', ['user', 'group'])
 export class GroupMembership {
   @PrimaryGeneratedColumn('uuid')
   id!: string
diff --git a/packages/db/migrations/0102.do.add_unique_constraint_in_group_membership.sql b/packages/db/migrations/0102.do.add_unique_constraint_in_group_membership.sql
new file mode 100755
index 000000000..583a5c885
--- /dev/null
+++ b/packages/db/migrations/0102.do.add_unique_constraint_in_group_membership.sql
@@ -0,0 +1,9 @@
+-- Type: DO
+-- Name: add_unique_constraint_in_group_membership
+-- Description: Add unique constraint in group_membership table
+
+BEGIN;
+
+ALTER TABLE omnivore.group_membership ADD CONSTRAINT group_membership_unique UNIQUE (group_id, user_id);
+
+COMMIT;
diff --git a/packages/db/migrations/0102.undo.add_unique_constraint_in_group_membership.sql b/packages/db/migrations/0102.undo.add_unique_constraint_in_group_membership.sql
new file mode 100755
index 000000000..699e71e9d
--- /dev/null
+++ b/packages/db/migrations/0102.undo.add_unique_constraint_in_group_membership.sql
@@ -0,0 +1,9 @@
+-- Type: UNDO
+-- Name: add_unique_constraint_in_group_membership
+-- Description: Add unique constraint in group_membership table
+
+BEGIN;
+
+ALTER TABLE omnivore.group_membership DROP CONSTRAINT IF EXISTS group_membership_unique;
+
+COMMIT;