Added view count tracking with personalised lists

app/Services/ViewService.php

@@ -0,0 +1,77 @@
+<?php namespace BookStack\Services;
+
+
+use BookStack\Entity;
+use BookStack\View;
+
+class ViewService
+{
+
+    protected $view;
+    protected $user;
+
+    /**
+     * ViewService constructor.
+     * @param $view
+     */
+    public function __construct(View $view)
+    {
+        $this->view = $view;
+        $this->user = auth()->user();
+    }
+
+    /**
+     * Add a view to the given entity.
+     * @param Entity $entity
+     * @return int
+     */
+    public function add(Entity $entity)
+    {
+        $view = $entity->views()->where('user_id', '=', $this->user->id)->first();
+        // Add view if model exists
+        if ($view) {
+            $view->increment('views');
+            return $view->views;
+        }
+
+        // Otherwise create new view count
+        $entity->views()->save($this->view->create([
+            'user_id' => $this->user->id,
+            'views' => 1
+        ]));
+
+        return 1;
+    }
+
+    /**
+     * Get all recently viewed entities for the current user.
+     * @param int         $count
+     * @param int         $page
+     * @param Entity|bool $filterModel
+     * @return mixed
+     */
+    public function getUserRecentlyViewed($count = 10, $page = 0, $filterModel = false)
+    {
+        $skipCount = $count * $page;
+        $query = $this->view->where('user_id', '=', auth()->user()->id);
+
+        if ($filterModel) $query->where('viewable_type', '=', get_class($filterModel));
+
+        $views = $query->with('viewable')->orderBy('updated_at', 'desc')->skip($skipCount)->take($count)->get();
+        $viewedEntities = $views->map(function ($item) {
+            return $item->viewable()->getResults();
+        });
+        return $viewedEntities;
+    }
+
+
+    /**
+     * Reset all view counts by deleting all views.
+     */
+    public function resetAll()
+    {
+        $this->view->truncate();
+    }
+
+
+}