2 files changed, 30 insertions, 0 deletions

diff --git a/server/models/activitypub/actor-follow.ts b/server/models/activitypub/actor-follow.ts
index de5bb6f74..435d22db5 100644
--- a/server/models/activitypub/actor-follow.ts
+++ b/server/models/activitypub/actor-follow.ts
@@ -2,6 +2,7 @@ import * as Bluebird from 'bluebird'
 import { values } from 'lodash'
 import * as Sequelize from 'sequelize'
 import {
+  AfterCreate, AfterDestroy, AfterUpdate,
   AllowNull, BelongsTo, Column, CreatedAt, DataType, Default, ForeignKey, IsInt, Max, Model, Table,
   UpdatedAt
 } from 'sequelize-typescript'
@@ -79,6 +80,25 @@ export class ActorFollowModel extends Model<ActorFollowModel> {
   })
   ActorFollowing: ActorModel
 
+  @AfterCreate
+  @AfterUpdate
+  static incrementFollowerAndFollowingCount (instance: ActorFollowModel) {
+    if (instance.state !== 'accepted') return
+
+    return Promise.all([
+      ActorModel.incrementFollows(instance.actorId, 'followingCount', 1),
+      ActorModel.incrementFollows(instance.targetActorId, 'followersCount', 1)
+    ])
+  }
+
+  @AfterDestroy
+  static decrementFollowerAndFollowingCount (instance: ActorFollowModel) {
+    return Promise.all([
+      ActorModel.incrementFollows(instance.actorId, 'followingCount',-1),
+      ActorModel.incrementFollows(instance.targetActorId, 'followersCount', -1)
+    ])
+  }
+
   // Remove actor follows with a score of 0 (too many requests where they were unreachable)
   static async removeBadActorFollows () {
     const actorFollows = await ActorFollowModel.listBadActorFollows()
diff --git a/server/models/activitypub/actor.ts b/server/models/activitypub/actor.ts
index 17f69f7a7..b7be9c32c 100644
--- a/server/models/activitypub/actor.ts
+++ b/server/models/activitypub/actor.ts
@@ -264,6 +264,16 @@ export class ActorModel extends Model<ActorModel> {
     return ActorModel.scope(ScopeNames.FULL).findOne(query)
   }
 
+  static incrementFollows (id: number, column: 'followersCount' | 'followingCount', by: number) {
+    // FIXME: typings
+    return (ActorModel as any).increment(column, {
+      by,
+      where: {
+        id
+      }
+    })
+  }
+
   toFormattedJSON () {
     let avatar: Avatar = null
     if (this.Avatar) {