added getMutuals service

packages/server/src/services/getMutuals/index.js

@@ -0,0 +1,30 @@
+import { User, UserFollow } from "@models"
+
+// TODO: Sort follows by last activity
+export default async (payload = {}) => {
+    const from_user_id = payload.from_user_id
+
+    if (!from_user_id) {
+        throw new Error("Missing from_user_id")
+    }
+
+    let mutuals = []
+
+    // load friends and recents users
+    const follows = await UserFollow.find({
+        user_id: from_user_id,
+    })
+        .limit(15)
+
+    mutuals = await UserFollow.find({
+        user_id: follows.map((follow) => follow.to.toString()),
+        to: from_user_id,
+    })
+
+    // load data user
+    mutuals = await User.find({
+        _id: mutuals.map((mutual) => mutual.user_id.toString()),
+    })
+
+    return mutuals
+}