fix: Group membership count off after suspending users in groups (#1670)

* fix: Clear group memberships when suspending a user
Refactor to command

* test

* test

server/commands/userSuspender.js

@@ -0,0 +1,44 @@
+// @flow
+import { ValidationError } from "../errors";
+import { User, Event, GroupUser } from "../models";
+import { sequelize } from "../sequelize";
+
+export default async function userSuspender({
+  user,
+  actorId,
+  ip,
+}: {
+  user: User,
+  actorId: string,
+  ip: string,
+}): Promise<void> {
+  if (user.id === actorId) {
+    throw new ValidationError("Unable to suspend the current user");
+  }
+
+  let transaction;
+  try {
+    transaction = await sequelize.transaction();
+
+    await user.update({
+      suspendedById: actorId,
+      suspendedAt: new Date(),
+    });
+
+    await GroupUser.destroy({ where: { userId: user.id } });
+  } catch (err) {
+    if (transaction) {
+      await transaction.rollback();
+    }
+    throw err;
+  }
+
+  await Event.create({
+    name: "users.suspend",
+    actorId,
+    userId: user.id,
+    teamId: user.teamId,
+    data: { name: user.name },
+    ip,
+  });
+}