diff --git a/app/Caches/ChapterCounter.php b/app/Caches/ChapterCounter.php
new file mode 100644
index 00000000..c3f840c9
--- /dev/null
+++ b/app/Caches/ChapterCounter.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Caches;
+
+use App\Repos\Chapter as ChapterRepo;
+
+class ChapterCounter extends Counter
+{
+
+    protected $lifetime = 7 * 86400;
+
+    public function getLifetime()
+    {
+        return $this->lifetime;
+    }
+
+    public function getKey($id = null)
+    {
+        return "chapter_counter:{$id}";
+    }
+
+    public function getContent($id = null)
+    {
+        $chapterRepo = new ChapterRepo();
+
+        $chapter = $chapterRepo->findById($id);
+
+        return [
+            'user_count' => $chapter->user_count,
+            'lesson_count' => $chapter->lesson_count,
+            'comment_count' => $chapter->comment_count,
+            'agree_count' => $chapter->agree_count,
+            'oppose_count' => $chapter->oppose_count,
+        ];
+    }
+
+}
diff --git a/app/Caches/CourseCounter.php b/app/Caches/CourseCounter.php
new file mode 100644
index 00000000..bed56542
--- /dev/null
+++ b/app/Caches/CourseCounter.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Caches;
+
+use App\Repos\Course as CourseRepo;
+
+class CourseCounter extends Counter
+{
+
+    protected $lifetime = 7 * 86400;
+
+    public function getLifetime()
+    {
+        return $this->lifetime;
+    }
+
+    public function getKey($id = null)
+    {
+        return "course_counter:{$id}";
+    }
+
+    public function getContent($id = null)
+    {
+        $courseRepo = new CourseRepo();
+
+        $course = $courseRepo->findById($id);
+
+        return [
+            'user_count' => $course->user_count,
+            'lesson_count' => $course->lesson_count,
+            'comment_count' => $course->comment_count,
+            'consult_count' => $course->consult_count,
+            'review_count' => $course->review_count,
+            'favorite_count' => $course->favorite_count,
+        ];
+    }
+
+}
diff --git a/app/Caches/CoursePackageList.php b/app/Caches/CoursePackageList.php
index 2767cca2..2f59296b 100644
--- a/app/Caches/CoursePackageList.php
+++ b/app/Caches/CoursePackageList.php
@@ -5,6 +5,7 @@ namespace App\Caches;
 use App\Models\Package as PackageModel;
 use App\Repos\Course as CourseRepo;
 use App\Repos\Package as PackageRepo;
+use Phalcon\Mvc\Model\Resultset;
 
 class CoursePackageList extends Cache
 {
@@ -27,19 +28,19 @@ class CoursePackageList extends Cache
 
         $packages = $courseRepo->findPackages($id);
 
-        if ($packages->count() == 0) {
-            return [];
-        }
-
         return $this->handleContent($packages);
     }
 
     /**
-     * @param PackageModel[] $packages
+     * @param Resultset|PackageModel[] $packages
      * @return array
      */
     protected function handleContent($packages)
     {
+        if ($packages->count() == 0) {
+            return [];
+        }
+
         $result = [];
 
         foreach ($packages as $package) {
@@ -64,6 +65,10 @@ class CoursePackageList extends Cache
 
         $courses = $packageRepo->findCourses($packageId);
 
+        if ($courses->count() == 0) {
+            return [];
+        }
+
         $result = [];
 
         $baseUrl = kg_ci_base_url();
diff --git a/app/Console/Tasks/RebuildChapterCacheTask.php b/app/Console/Tasks/RebuildChapterCacheTask.php
index a1763e33..4f648df0 100644
--- a/app/Console/Tasks/RebuildChapterCacheTask.php
+++ b/app/Console/Tasks/RebuildChapterCacheTask.php
@@ -7,7 +7,6 @@ use App\Caches\ChapterCounter as ChapterCounterCache;
 use App\Library\Cache\Backend\Redis as RedisCache;
 use App\Repos\Chapter as ChapterRepo;
 use App\Services\ChapterCacheSyncer;
-use Phalcon\Mvc\Model\Resultset;
 
 class RebuildChapterCacheTask extends Task
 {
@@ -41,9 +40,6 @@ class RebuildChapterCacheTask extends Task
 
         $chapterRepo = new ChapterRepo();
 
-        /**
-         * @var Resultset $chapters
-         */
         $chapters = $chapterRepo->findByIds($chapterIds);
 
         if ($chapters->count() == 0) {
@@ -51,24 +47,32 @@ class RebuildChapterCacheTask extends Task
         }
 
         $chapterCache = new ChapterCache();
+
         $counterCache = new ChapterCounterCache();
 
         foreach ($chapters as $chapter) {
+
             $chapter->user_count = $chapterRepo->countUsers($chapter->id);
+            $chapter->lesson_count = $chapterRepo->countLessons($chapter->id);
             $chapter->comment_count = $chapterRepo->countComments($chapter->id);
-            $chapter->like_count = $chapterRepo->countLikes($chapter->id);
+            $chapter->agree_count = $chapterRepo->countAgrees($chapter->id);
+            $chapter->oppose_count = $chapterRepo->countOpposes($chapter->id);
+
             $chapter->update();
 
             $chapterCache->rebuild($chapter->id);
+
             $counterCache->rebuild($chapter->id);
         }
+
+        $this->redis->sRem($key, ...$chapterIds);
     }
 
     protected function getCacheKey()
     {
         $syncer = new ChapterCacheSyncer();
 
-        return $syncer->getCacheKey();
+        return $syncer->getSyncKey();
     }
 
 }
diff --git a/app/Console/Tasks/RebuildCourseCacheTask.php b/app/Console/Tasks/RebuildCourseCacheTask.php
index cb55d9a7..f78a3c8f 100644
--- a/app/Console/Tasks/RebuildCourseCacheTask.php
+++ b/app/Console/Tasks/RebuildCourseCacheTask.php
@@ -5,10 +5,8 @@ namespace App\Console\Tasks;
 use App\Caches\Course as CourseCache;
 use App\Caches\CourseCounter as CourseCounterCache;
 use App\Library\Cache\Backend\Redis as RedisCache;
-use App\Models\Course as CourseModel;
 use App\Repos\Course as CourseRepo;
 use App\Services\CourseCacheSyncer;
-use Phalcon\Mvc\Model\Resultset;
 
 class RebuildCourseCacheTask extends Task
 {
@@ -42,9 +40,6 @@ class RebuildCourseCacheTask extends Task
 
         $courseRepo = new CourseRepo();
 
-        /**
-         * @var Resultset|CourseModel[] $courses
-         */
         $courses = $courseRepo->findByIds($courseIds);
 
         if ($courses->count() == 0) {
@@ -52,18 +47,22 @@ class RebuildCourseCacheTask extends Task
         }
 
         $courseCache = new CourseCache();
+
         $counterCache = new CourseCounterCache();
 
         foreach ($courses as $course) {
 
             $course->user_count = $courseRepo->countUsers($course->id);
+            $course->lesson_count = $courseRepo->countLessons($course->id);
             $course->comment_count = $courseRepo->countComments($course->id);
+            $course->consult_count = $courseRepo->countConsults($course->id);
             $course->review_count = $courseRepo->countReviews($course->id);
             $course->favorite_count = $courseRepo->countFavorites($course->id);
 
             $course->update();
 
             $courseCache->rebuild($course->id);
+
             $counterCache->rebuild($course->id);
         }
 
@@ -74,7 +73,7 @@ class RebuildCourseCacheTask extends Task
     {
         $syncer = new CourseCacheSyncer();
 
-        return $syncer->getCacheKey();
+        return $syncer->getSyncKey();
     }
 
 }
diff --git a/app/Http/Admin/Services/Category.php b/app/Http/Admin/Services/Category.php
index 7e2bf2e5..faae26c5 100644
--- a/app/Http/Admin/Services/Category.php
+++ b/app/Http/Admin/Services/Category.php
@@ -2,6 +2,9 @@
 
 namespace App\Http\Admin\Services;
 
+use App\Caches\Category as CategoryCache;
+use App\Caches\CategoryList as CategoryListCache;
+use App\Caches\CategoryTreeList as CategoryTreeListCache;
 use App\Models\Category as CategoryModel;
 use App\Repos\Category as CategoryRepo;
 use App\Validators\Category as CategoryValidator;
@@ -86,6 +89,7 @@ class Category extends Service
         $category->update();
 
         $this->updateCategoryStats($category);
+        $this->rebuildCategoryCache($category);
 
         return $category;
     }
@@ -122,6 +126,7 @@ class Category extends Service
         $category->update($data);
 
         $this->updateCategoryStats($category);
+        $this->rebuildCategoryCache($category);
 
         return $category;
     }
@@ -139,6 +144,7 @@ class Category extends Service
         $category->update();
 
         $this->updateCategoryStats($category);
+        $this->rebuildCategoryCache($category);
 
         return $category;
     }
@@ -152,6 +158,7 @@ class Category extends Service
         $category->update();
 
         $this->updateCategoryStats($category);
+        $this->rebuildCategoryCache($category);
 
         return $category;
     }
@@ -169,6 +176,21 @@ class Category extends Service
         $category->update();
     }
 
+    protected function rebuildCategoryCache(CategoryModel $category)
+    {
+        $itemCache = new CategoryCache();
+
+        $itemCache->rebuild($category->id);
+
+        $listCache = new CategoryListCache();
+
+        $listCache->rebuild();
+
+        $treeListCache = new CategoryTreeListCache();
+
+        $treeListCache->rebuild();
+    }
+
     protected function enableChildCategories($parentId)
     {
         $categoryRepo = new CategoryRepo();
diff --git a/app/Http/Admin/Services/Chapter.php b/app/Http/Admin/Services/Chapter.php
index af1151d7..98cd2406 100644
--- a/app/Http/Admin/Services/Chapter.php
+++ b/app/Http/Admin/Services/Chapter.php
@@ -2,6 +2,7 @@
 
 namespace App\Http\Admin\Services;
 
+use App\Caches\CourseChapterList as CourseChapterListCache;
 use App\Models\Chapter as ChapterModel;
 use App\Models\Course as CourseModel;
 use App\Repos\Chapter as ChapterRepo;
@@ -59,6 +60,7 @@ class Chapter extends Service
 
         $this->updateChapterStats($chapter);
         $this->updateCourseStats($chapter);
+        $this->rebuildChapterCache($chapter);
 
         return $chapter;
     }
@@ -100,6 +102,7 @@ class Chapter extends Service
 
         $this->updateChapterStats($chapter);
         $this->updateCourseStats($chapter);
+        $this->rebuildChapterCache($chapter);
 
         return $chapter;
     }
@@ -118,6 +121,7 @@ class Chapter extends Service
 
         $this->updateChapterStats($chapter);
         $this->updateCourseStats($chapter);
+        $this->rebuildChapterCache($chapter);
 
         return $chapter;
     }
@@ -132,6 +136,7 @@ class Chapter extends Service
 
         $this->updateChapterStats($chapter);
         $this->updateCourseStats($chapter);
+        $this->rebuildChapterCache($chapter);
 
         return $chapter;
     }
@@ -168,6 +173,13 @@ class Chapter extends Service
         }
     }
 
+    protected function rebuildChapterCache(ChapterModel $chapter)
+    {
+        $cache = new CourseChapterListCache();
+
+        $cache->rebuild($chapter->course_id);
+    }
+
     protected function findOrFail($id)
     {
         $validator = new ChapterValidator();
diff --git a/app/Http/Admin/Services/Course.php b/app/Http/Admin/Services/Course.php
index d955024f..12b7c970 100644
--- a/app/Http/Admin/Services/Course.php
+++ b/app/Http/Admin/Services/Course.php
@@ -3,6 +3,9 @@
 namespace App\Http\Admin\Services;
 
 use App\Builders\CourseList as CourseListBuilder;
+use App\Caches\CourseCategoryList as CourseCategoryListCache;
+use App\Caches\CourseRelatedList as CourseRelatedListCache;
+use App\Caches\CourseTeacherList as CourseTeacherListCache;
 use App\Library\Paginator\Query as PagerQuery;
 use App\Models\Course as CourseModel;
 use App\Models\CourseCategory as CourseCategoryModel;
@@ -348,6 +351,10 @@ class Course extends Service
                 }
             }
         }
+
+        $cache = new CourseTeacherListCache();
+
+        $cache->rebuild();
     }
 
     protected function saveCategories(CourseModel $course, $categoryIds)
@@ -388,6 +395,17 @@ class Course extends Service
                 }
             }
         }
+
+        $categoryId = $newCategoryIds[0] ?? 0;
+
+        if ($categoryId) {
+            $course->category_id = $categoryId;
+            $course->update();
+        }
+
+        $cache = new CourseCategoryListCache();
+
+        $cache->rebuild($course->id);
     }
 
     protected function saveRelatedCourses(CourseModel $course, $courseIds)
@@ -449,6 +467,10 @@ class Course extends Service
                 }
             }
         }
+
+        $cache = new CourseRelatedListCache();
+
+        $cache->rebuild($course->id);
     }
 
     protected function handleCourses($pager)
diff --git a/app/Http/Admin/Services/Nav.php b/app/Http/Admin/Services/Nav.php
index b0a0d36d..bfe3634a 100644
--- a/app/Http/Admin/Services/Nav.php
+++ b/app/Http/Admin/Services/Nav.php
@@ -92,6 +92,8 @@ class Nav extends Service
 
         $this->updateNavStats($nav);
 
+        $this->rebuildNavCache();
+
         return $nav;
     }
 
@@ -140,6 +142,8 @@ class Nav extends Service
 
         $this->updateNavStats($nav);
 
+        $this->rebuildNavCache();
+
         return $nav;
     }
 
@@ -157,6 +161,8 @@ class Nav extends Service
 
         $this->updateNavStats($nav);
 
+        $this->rebuildNavCache();
+
         return $nav;
     }
 
@@ -170,6 +176,8 @@ class Nav extends Service
 
         $this->updateNavStats($nav);
 
+        $this->rebuildNavCache();
+
         return $nav;
     }
 
@@ -182,10 +190,16 @@ class Nav extends Service
         }
 
         $childCount = $navRepo->countChildNavs($nav->id);
-        $nav->child_count = $childCount;
-        $nav->update();
 
+        $nav->child_count = $childCount;
+
+        $nav->update();
+    }
+
+    protected function rebuildNavCache()
+    {
         $cache = new NavTreeListCache();
+
         $cache->rebuild();
     }
 
diff --git a/app/Http/Admin/Services/Slide.php b/app/Http/Admin/Services/Slide.php
index 1708a369..afa43bed 100644
--- a/app/Http/Admin/Services/Slide.php
+++ b/app/Http/Admin/Services/Slide.php
@@ -2,6 +2,7 @@
 
 namespace App\Http\Admin\Services;
 
+use App\Caches\SlideList as SlideListCache;
 use App\Library\Paginator\Query as PagerQuery;
 use App\Models\Slide as SlideModel;
 use App\Repos\Slide as SlideRepo;
@@ -59,6 +60,8 @@ class Slide extends Service
 
         $slide->create($data);
 
+        $this->rebuildSlideCache();
+
         return $slide;
     }
 
@@ -106,6 +109,8 @@ class Slide extends Service
 
         $slide->update($data);
 
+        $this->rebuildSlideCache();
+
         return $slide;
     }
 
@@ -117,6 +122,8 @@ class Slide extends Service
 
         $slide->update();
 
+        $this->rebuildSlideCache();
+
         return $slide;
     }
 
@@ -128,9 +135,18 @@ class Slide extends Service
 
         $slide->update();
 
+        $this->rebuildSlideCache();
+
         return $slide;
     }
 
+    protected function rebuildSlideCache()
+    {
+        $cache = new SlideListCache();
+
+        $cache->rebuild();
+    }
+
     protected function findOrFail($id)
     {
         $validator = new SlideValidator();
diff --git a/app/Library/Helper.php b/app/Library/Helper.php
index e3694a5c..69be136a 100644
--- a/app/Library/Helper.php
+++ b/app/Library/Helper.php
@@ -53,7 +53,7 @@ function kg_uniqid($prefix = '', $more = false)
  */
 function kg_json_encode($data)
 {
-    $options = JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE;
+    $options = JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_PRESERVE_ZERO_FRACTION;
 
     return json_encode($data, $options);
 }
diff --git a/app/Listeners/ChapterCounter.php b/app/Listeners/ChapterCounter.php
new file mode 100644
index 00000000..f9b91d9f
--- /dev/null
+++ b/app/Listeners/ChapterCounter.php
@@ -0,0 +1,69 @@
+<?php
+
+namespace App\Listeners;
+
+use App\Caches\ChapterCounter as CacheChapterCounter;
+use App\Models\User as ChapterModel;
+use Phalcon\Events\Event;
+
+class ChapterCounter extends Listener
+{
+
+    protected $counter;
+
+    public function __construct()
+    {
+        $this->counter = new CacheChapterCounter();
+    }
+
+    public function incrUserCount(Event $event, $source, ChapterModel $chapter)
+    {
+        $this->counter->hIncrBy($chapter->id, 'user_count');
+    }
+
+    public function decrUserCount(Event $event, $source, ChapterModel $chapter)
+    {
+        $this->counter->hDecrBy($chapter->id, 'user_count');
+    }
+
+    public function incrCommentCount(Event $event, $source, ChapterModel $chapter)
+    {
+        $this->counter->hIncrBy($chapter->id, 'comment_count');
+    }
+
+    public function decrCommentCount(Event $event, $source, ChapterModel $chapter)
+    {
+        $this->counter->hDecrBy($chapter->id, 'comment_count');
+    }
+
+    public function incrAgreeCount(Event $event, $source, ChapterModel $chapter)
+    {
+        $this->counter->hIncrBy($chapter->id, 'agree_count');
+    }
+
+    public function decrAgreeCount(Event $event, $source, ChapterModel $chapter)
+    {
+        $this->counter->hDecrBy($chapter->id, 'agree_count');
+    }
+
+    public function incrOpposeCount(Event $event, $source, ChapterModel $chapter)
+    {
+        $this->counter->hIncrBy($chapter->id, 'oppose_count');
+    }
+
+    public function decrOpposeCount(Event $event, $source, ChapterModel $chapter)
+    {
+        $this->counter->hDecrBy($chapter->id, 'oppose_count');
+    }
+
+    public function incrLessonCount(Event $event, $source, ChapterModel $chapter)
+    {
+        $this->counter->hIncrBy($chapter->id, 'lesson_count');
+    }
+
+    public function decrLessonCount(Event $event, $source, ChapterModel $chapter)
+    {
+        $this->counter->hDecrBy($chapter->id, 'lesson_count');
+    }
+
+}
\ No newline at end of file
diff --git a/app/Listeners/CourseCounter.php b/app/Listeners/CourseCounter.php
new file mode 100644
index 00000000..fd44517d
--- /dev/null
+++ b/app/Listeners/CourseCounter.php
@@ -0,0 +1,79 @@
+<?php
+
+namespace App\Listeners;
+
+use App\Caches\CourseCounter as CacheCourseCounter;
+use App\Models\User as CourseModel;
+use Phalcon\Events\Event;
+
+class CourseCounter extends Listener
+{
+
+    protected $counter;
+
+    public function __construct()
+    {
+        $this->counter = new CacheCourseCounter();
+    }
+
+    public function incrUserCount(Event $event, $source, CourseModel $course)
+    {
+        $this->counter->hIncrBy($course->id, 'user_count');
+    }
+
+    public function decrUserCount(Event $event, $source, CourseModel $course)
+    {
+        $this->counter->hDecrBy($course->id, 'user_count');
+    }
+
+    public function incrCommentCount(Event $event, $source, CourseModel $course)
+    {
+        $this->counter->hIncrBy($course->id, 'comment_count');
+    }
+
+    public function decrCommentCount(Event $event, $source, CourseModel $course)
+    {
+        $this->counter->hDecrBy($course->id, 'comment_count');
+    }
+
+    public function incrConsultCount(Event $event, $source, CourseModel $course)
+    {
+        $this->counter->hIncrBy($course->id, 'consult_count');
+    }
+
+    public function decrConsultCount(Event $event, $source, CourseModel $course)
+    {
+        $this->counter->hDecrBy($course->id, 'consult_count');
+    }
+
+    public function incrReviewCount(Event $event, $source, CourseModel $course)
+    {
+        $this->counter->hIncrBy($course->id, 'review_count');
+    }
+
+    public function decrReviewCount(Event $event, $source, CourseModel $course)
+    {
+        $this->counter->hDecrBy($course->id, 'review_count');
+    }
+
+    public function incrFavoriteCount(Event $event, $source, CourseModel $course)
+    {
+        $this->counter->hIncrBy($course->id, 'favorite_count');
+    }
+
+    public function decrFavoriteCount(Event $event, $source, CourseModel $course)
+    {
+        $this->counter->hDecrBy($course->id, 'favorite_count');
+    }
+
+    public function incrLessonCount(Event $event, $source, CourseModel $course)
+    {
+        $this->counter->hIncrBy($course->id, 'lesson_count');
+    }
+
+    public function decrLessonCount(Event $event, $source, CourseModel $course)
+    {
+        $this->counter->hDecrBy($course->id, 'lesson_count');
+    }
+
+}
\ No newline at end of file
diff --git a/app/Models/Category.php b/app/Models/Category.php
index 69a37811..d994ab83 100644
--- a/app/Models/Category.php
+++ b/app/Models/Category.php
@@ -2,9 +2,6 @@
 
 namespace App\Models;
 
-use App\Caches\Category as CategoryCache;
-use App\Caches\CategoryList as CategoryListCache;
-use App\Caches\CategoryTreeList as CategoryTreeListCache;
 use Phalcon\Mvc\Model\Behavior\SoftDelete;
 
 class Category extends Model
@@ -121,29 +118,4 @@ class Category extends Model
         $this->update_time = time();
     }
 
-    public function afterCreate()
-    {
-        $this->rebuildCache();
-    }
-
-    public function afterUpdate()
-    {
-        $this->rebuildCache();
-    }
-
-    public function rebuildCache()
-    {
-        $itemCache = new CategoryCache();
-
-        $itemCache->rebuild($this->id);
-
-        $listCache = new CategoryListCache();
-
-        $listCache->rebuild();
-
-        $treeListCache = new CategoryTreeListCache();
-
-        $treeListCache->rebuild();
-    }
-
 }
diff --git a/app/Models/Chapter.php b/app/Models/Chapter.php
index 01f5560e..79401f5a 100644
--- a/app/Models/Chapter.php
+++ b/app/Models/Chapter.php
@@ -218,7 +218,7 @@ class Chapter extends Model
     {
         $this->update_time = time();
 
-        if (!empty($this->attrs)) {
+        if (is_array($this->attrs) && !empty($this->attrs)) {
             $this->attrs = kg_json_encode($this->attrs);
         }
     }
diff --git a/app/Models/ChapterVod.php b/app/Models/ChapterVod.php
index e3bbf660..12fc5d4b 100644
--- a/app/Models/ChapterVod.php
+++ b/app/Models/ChapterVod.php
@@ -65,7 +65,7 @@ class ChapterVod extends Model
     {
         $this->create_time = time();
 
-        if (!empty($this->file_transcode)) {
+        if (is_array($this->file_transcode) && !empty($this->file_transcode)) {
             $this->file_transcode = kg_json_encode($this->file_transcode);
         }
     }
@@ -74,7 +74,7 @@ class ChapterVod extends Model
     {
         $this->update_time = time();
 
-        if (!empty($this->file_transcode)) {
+        if (is_array($this->file_transcode) && !empty($this->file_transcode)) {
             $this->file_transcode = kg_json_encode($this->file_transcode);
         }
     }
diff --git a/app/Models/Course.php b/app/Models/Course.php
index 92515895..cf1252a0 100644
--- a/app/Models/Course.php
+++ b/app/Models/Course.php
@@ -270,7 +270,7 @@ class Course extends Model
     {
         $this->update_time = time();
 
-        if (!empty($this->attrs)) {
+        if (is_array($this->attrs) && !empty($this->attrs)) {
             $this->attrs = kg_json_encode($this->attrs);
         }
     }
diff --git a/app/Models/Nav.php b/app/Models/Nav.php
index ea6d0e2b..dbe9bd6c 100644
--- a/app/Models/Nav.php
+++ b/app/Models/Nav.php
@@ -2,7 +2,6 @@
 
 namespace App\Models;
 
-use App\Caches\NavTreeList as NavTreeListCache;
 use Phalcon\Mvc\Model\Behavior\SoftDelete;
 
 class Nav extends Model
@@ -145,23 +144,6 @@ class Nav extends Model
         $this->update_time = time();
     }
 
-    public function afterCreate()
-    {
-        $this->rebuildCache();
-    }
-
-    public function afterUpdate()
-    {
-        $this->rebuildCache();
-    }
-
-    public function rebuildCache()
-    {
-        $cache = new NavTreeListCache();
-
-        $cache->rebuild();
-    }
-
     public static function positionTypes()
     {
         return [
diff --git a/app/Models/Order.php b/app/Models/Order.php
index 7b657a3e..504e268c 100644
--- a/app/Models/Order.php
+++ b/app/Models/Order.php
@@ -152,7 +152,7 @@ class Order extends Model
         $this->sn = date('YmdHis') . rand(1000, 9999);
         $this->create_time = time();
 
-        if (!empty($this->item_info)) {
+        if (is_array($this->item_info) && !empty($this->item_info)) {
             $this->item_info = kg_json_encode($this->item_info);
         } else {
             $this->item_info = '';
@@ -163,7 +163,7 @@ class Order extends Model
     {
         $this->update_time = time();
 
-        if (!empty($this->item_info)) {
+        if (is_array($this->item_info) && !empty($this->item_info)) {
             $this->item_info = kg_json_encode($this->item_info);
         }
     }
diff --git a/app/Models/Slide.php b/app/Models/Slide.php
index 6abd7054..8260dd9f 100644
--- a/app/Models/Slide.php
+++ b/app/Models/Slide.php
@@ -2,7 +2,6 @@
 
 namespace App\Models;
 
-use App\Caches\SlideList as SlideListCache;
 use Phalcon\Mvc\Model\Behavior\SoftDelete;
 
 class Slide extends Model
@@ -119,23 +118,6 @@ class Slide extends Model
         $this->update_time = time();
     }
 
-    public function afterCreate()
-    {
-        $this->rebuildCache();
-    }
-
-    public function afterUpdate()
-    {
-        $this->rebuildCache();
-    }
-
-    public function rebuildCache()
-    {
-        $cache = new SlideListCache();
-
-        $cache->rebuild();
-    }
-
     public static function targetTypes()
     {
         return [
diff --git a/app/Services/ChapterCacheSyncer.php b/app/Services/ChapterCacheSyncer.php
new file mode 100644
index 00000000..01f0bfbf
--- /dev/null
+++ b/app/Services/ChapterCacheSyncer.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Services;
+
+use App\Library\Cache\Backend\Redis as RedisCache;
+
+class ChapterCacheSyncer extends Service
+{
+
+    /**
+     * @var RedisCache
+     */
+    protected $cache;
+
+    /**
+     * @var \Redis
+     */
+    protected $redis;
+
+    /**
+     * @var int
+     */
+    protected $lifetime = 86400;
+
+    public function __construct()
+    {
+        $this->cache = $this->getDI()->get('cache');
+
+        $this->redis = $this->cache->getRedis();
+    }
+
+    public function addItem($chapterId)
+    {
+        $key = $this->getSyncKey();
+
+        $this->redis->sAdd($key, $chapterId);
+
+        $this->redis->expire($key, $this->lifetime);
+    }
+
+    public function getSyncKey()
+    {
+        return 'chapter_cache_sync';
+    }
+
+}
diff --git a/app/Services/CourseCacheSyncer.php b/app/Services/CourseCacheSyncer.php
new file mode 100644
index 00000000..65538a77
--- /dev/null
+++ b/app/Services/CourseCacheSyncer.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Services;
+
+use App\Library\Cache\Backend\Redis as RedisCache;
+
+class CourseCacheSyncer extends Service
+{
+
+    /**
+     * @var RedisCache
+     */
+    protected $cache;
+
+    /**
+     * @var \Redis
+     */
+    protected $redis;
+
+    /**
+     * @var int
+     */
+    protected $lifetime = 86400;
+
+    public function __construct()
+    {
+        $this->cache = $this->getDI()->get('cache');
+
+        $this->redis = $this->cache->getRedis();
+    }
+
+    public function addItem($courseId)
+    {
+        $key = $this->getSyncKey();
+
+        $this->redis->sAdd($key, $courseId);
+
+        $this->redis->expire($key, $this->lifetime);
+    }
+
+    public function getSyncKey()
+    {
+        return 'course_cache_sync';
+    }
+
+}
diff --git a/app/Services/Frontend/Course/ChapterList.php b/app/Services/Frontend/Course/ChapterList.php
index b94fa56e..5eae58de 100644
--- a/app/Services/Frontend/Course/ChapterList.php
+++ b/app/Services/Frontend/Course/ChapterList.php
@@ -40,7 +40,11 @@ class ChapterList extends Service
         return $this->handleChapters($chapters);
     }
 
-    protected function handleChapters(Resultset $chapters)
+    /**
+     * @param Resultset $chapters
+     * @return array
+     */
+    protected function handleChapters($chapters)
     {
         if ($chapters->count() == 0) {
             return [];
diff --git a/app/Services/Frontend/Course/PackageList.php b/app/Services/Frontend/Course/PackageList.php
index f3e4624b..4de932be 100644
--- a/app/Services/Frontend/Course/PackageList.php
+++ b/app/Services/Frontend/Course/PackageList.php
@@ -2,6 +2,7 @@
 
 namespace App\Services\Frontend\Course;
 
+use App\Models\Package as PackageModel;
 use App\Repos\Course as CourseRepo;
 use App\Repos\Package as PackageRepo;
 use App\Services\Frontend\CourseTrait;
@@ -25,7 +26,7 @@ class PackageList extends Service
     }
 
     /**
-     * @param Resultset $packages
+     * @param Resultset|PackageModel[] $packages
      * @return array
      */
     protected function handlePackages($packages)
@@ -58,6 +59,10 @@ class PackageList extends Service
 
         $courses = $packageRepo->findCourses($packageId);
 
+        if ($courses->count() == 0) {
+            return [];
+        }
+
         $result = [];
 
         $baseUrl = kg_ci_base_url();