init following storage

src/application/model/follow.php

@@ -0,0 +1,27 @@
+<?php
+
+class ModelFollow extends Model {
+
+  public function getFollow($userId) {
+
+    try {
+
+      $query = $this->_db->execute("SELECT `followUser`.`userId` FROM `followUser`
+                                                                 JOIN `follow` ON (`follow`.`followId` = `followUser`.`followId`)
+
+                                                                 WHERE `follow`.`userId` = ?
+
+                                                                 GROUP BY `followUser`.`userId`
+                                                                 ORDER BY `follow`.`seq` DESC");
+
+      $query->execute([$userId]);
+
+      return $query->rowCount() ? $query->fetch() : [];
+
+    } catch (PDOException $e) {
+
+      trigger_error($e->getMessage());
+      return false;
+    }
+  }
+}