diff --git a/composer.json b/composer.json
index a3f53e8..913c395 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
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     "require": {
     	"cakephp/cakephp": "3.*",
-    	"casbin/casbin": "0.*"
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diff --git a/composer.lock b/composer.lock
index fed97cc..c12b3df 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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+    "content-hash": "a4670a8353dea3d8bd27e46cc1da7585",
     "packages": [
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             "name": "aura/intl",
@@ -56,20 +56,24 @@
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                 "localization"
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+                "source": "https://github.com/auraphp/Aura.Intl/tree/3.x"
+            },
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-            "version": "3.9.9",
+            "version": "3.9.10",
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@@ -154,7 +158,13 @@
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                 "validation"
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-            "time": "2021-04-24T04:48:18+00:00"
+            "support": {
+                "forum": "https://stackoverflow.com/tags/cakephp",
+                "irc": "irc://irc.freenode.org/cakephp",
+                "issues": "https://github.com/cakephp/cakephp/issues",
+                "source": "https://github.com/cakephp/cakephp"
+            },
+            "time": "2021-05-31T01:20:39+00:00"
         },
         {
             "name": "cakephp/chronos",
@@ -216,20 +226,25 @@
                 "datetime",
                 "time"
             ],
+            "support": {
+                "irc": "irc://irc.freenode.org/cakephp",
+                "issues": "https://github.com/cakephp/chronos/issues",
+                "source": "https://github.com/cakephp/chronos"
+            },
             "time": "2019-11-30T02:33:19+00:00"
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-            "version": "v0.2.1",
+            "version": "v3.3.0",
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                 "url": "https://github.com/php-casbin/php-casbin.git",
-                "reference": "73c57e26f6e0e5dd82f757803e38dde85f465faa"
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@@ -239,13 +254,14 @@
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-                "phpunit/phpunit": "~5.7"
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@@ -265,12 +281,25 @@
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             "keywords": [
+                "abac",
                 "access control",
                 "acl",
+                "authorization",
                 "casbin",
+                "permission",
                 "rbac"
             ],
-            "time": "2019-03-01T04:43:43+00:00"
+            "support": {
+                "issues": "https://github.com/php-casbin/php-casbin/issues",
+                "source": "https://github.com/php-casbin/php-casbin/tree/v3.3.0"
+            },
+            "funding": [
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+                    "url": "https://opencollective.com/casbin",
+                    "type": "open_collective"
+                }
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+            "time": "2021-05-26T12:42:18+00:00"
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         {
             "name": "laminas/laminas-diactoros",
@@ -351,6 +380,14 @@
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                 "psr-7"
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+            "support": {
+                "chat": "https://laminas.dev/chat",
+                "docs": "https://docs.laminas.dev/laminas-diactoros/",
+                "forum": "https://discourse.laminas.dev",
+                "issues": "https://github.com/laminas/laminas-diactoros/issues",
+                "rss": "https://github.com/laminas/laminas-diactoros/releases.atom",
+                "source": "https://github.com/laminas/laminas-diactoros"
+            },
             "time": "2020-03-23T15:28:28+00:00"
         },
         {
@@ -407,6 +444,12 @@
                 "laminas",
                 "zf"
             ],
+            "support": {
+                "forum": "https://discourse.laminas.dev/",
+                "issues": "https://github.com/laminas/laminas-zendframework-bridge/issues",
+                "rss": "https://github.com/laminas/laminas-zendframework-bridge/releases.atom",
+                "source": "https://github.com/laminas/laminas-zendframework-bridge"
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@@ -464,8 +507,122 @@
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                 "random"
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+                "issues": "https://github.com/paragonie/random_compat/issues",
+                "source": "https://github.com/paragonie/random_compat"
+            },
             "time": "2018-07-02T15:55:56+00:00"
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+            "version": "1.0.1",
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+                "url": "https://github.com/php-fig/cache.git",
+                "reference": "d11b50ad223250cf17b86e38383413f5a6764bf8"
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+            "license": [
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+                    "homepage": "http://www.php-fig.org/"
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+            "keywords": [
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+                "psr",
+                "psr-6"
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+                "url": "https://github.com/php-fig/container.git",
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+                    "homepage": "https://www.php-fig.org/"
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+            "description": "Common Container Interface (PHP FIG PSR-11)",
+            "homepage": "https://github.com/php-fig/container",
+            "keywords": [
+                "PSR-11",
+                "container",
+                "container-interface",
+                "container-interop",
+                "psr"
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+                "source": "https://github.com/php-fig/container/tree/1.1.1"
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+            "time": "2021-03-05T17:36:06+00:00"
+        },
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             "name": "psr/http-message",
             "version": "1.0.1",
@@ -520,6 +677,9 @@
                 "request",
                 "response"
             ],
+            "support": {
+                "source": "https://github.com/php-fig/http-message/tree/master"
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@@ -573,6 +733,9 @@
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@@ -627,6 +790,9 @@
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@@ -684,20 +850,24 @@
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+                "source": "https://github.com/S1lentium/IPTools/tree/master"
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@@ -707,17 +877,43 @@
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+                "psr/simple-cache": "^1.0",
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+                "symfony/dependency-injection": "^4.4|^5.0",
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+                "symfony/http-kernel": "^4.4|^5.0",
+                "symfony/messenger": "^4.4|^5.0",
+                "symfony/var-dumper": "^4.4|^5.0"
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@@ -729,32 +925,534 @@
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-                    "email": "fabien@symfony.com"
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+                    "homepage": "https://symfony.com/contributors"
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@@ -853,6 +1555,12 @@
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@@ -904,6 +1612,10 @@
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@@ -1973,6 +2695,10 @@
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@@ -2100,6 +2830,10 @@
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@@ -2233,6 +2971,10 @@
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@@ -2375,6 +3121,10 @@
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-                    "dev-main": "2.4-dev"
-                },
-                "thanks": {
-                    "name": "symfony/contracts",
-                    "url": "https://github.com/symfony/contracts"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Contracts\\Service\\": ""
-                }
+            "support": {
+                "source": "https://github.com/symfony/polyfill-php81/tree/v1.23.0"
             },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Nicolas Grekas",
-                    "email": "p@tchwork.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Generic abstractions related to writing services",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "abstractions",
-                "contracts",
-                "decoupling",
-                "interfaces",
-                "interoperability",
-                "standards"
-            ],
             "funding": [
                 {
                     "url": "https://symfony.com/sponsor",
@@ -3561,20 +4204,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-04-01T10:43:52+00:00"
+            "time": "2021-05-21T13:25:03+00:00"
         },
         {
             "name": "symfony/string",
-            "version": "v5.2.6",
+            "version": "v5.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/string.git",
-                "reference": "ad0bd91bce2054103f5eaa18ebeba8d3bc2a0572"
+                "reference": "a9a0f8b6aafc5d2d1c116dcccd1573a95153515b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/string/zipball/ad0bd91bce2054103f5eaa18ebeba8d3bc2a0572",
-                "reference": "ad0bd91bce2054103f5eaa18ebeba8d3bc2a0572",
+                "url": "https://api.github.com/repos/symfony/string/zipball/a9a0f8b6aafc5d2d1c116dcccd1573a95153515b",
+                "reference": "a9a0f8b6aafc5d2d1c116dcccd1573a95153515b",
                 "shasum": "",
                 "mirrors": [
                     {
@@ -3633,6 +4276,9 @@
                 "utf-8",
                 "utf8"
             ],
+            "support": {
+                "source": "https://github.com/symfony/string/tree/v5.3.0"
+            },
             "funding": [
                 {
                     "url": "https://symfony.com/sponsor",
@@ -3647,20 +4293,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-03-17T17:12:15+00:00"
+            "time": "2021-05-26T17:43:10+00:00"
         },
         {
             "name": "symfony/yaml",
-            "version": "v5.2.7",
+            "version": "v5.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "76546cbeddd0a9540b4e4e57eddeec3e9bb444a5"
+                "reference": "3bbcf262fceb3d8f48175302e6ba0ac96e3a5a11"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/76546cbeddd0a9540b4e4e57eddeec3e9bb444a5",
-                "reference": "76546cbeddd0a9540b4e4e57eddeec3e9bb444a5",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/3bbcf262fceb3d8f48175302e6ba0ac96e3a5a11",
+                "reference": "3bbcf262fceb3d8f48175302e6ba0ac96e3a5a11",
                 "shasum": "",
                 "mirrors": [
                     {
@@ -3711,6 +4357,9 @@
             ],
             "description": "Loads and dumps YAML files",
             "homepage": "https://symfony.com",
+            "support": {
+                "source": "https://github.com/symfony/yaml/tree/v5.3.0"
+            },
             "funding": [
                 {
                     "url": "https://symfony.com/sponsor",
@@ -3725,7 +4374,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-04-29T20:47:09+00:00"
+            "time": "2021-05-26T17:43:10+00:00"
         },
         {
             "name": "theseer/tokenizer",
@@ -3771,6 +4420,10 @@
                 }
             ],
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/master"
+            },
             "funding": [
                 {
                     "url": "https://github.com/theseer",
@@ -3837,6 +4490,10 @@
                 "check",
                 "validate"
             ],
+            "support": {
+                "issues": "https://github.com/webmozarts/assert/issues",
+                "source": "https://github.com/webmozarts/assert/tree/1.10.0"
+            },
             "time": "2021-03-09T10:59:23+00:00"
         }
     ],
@@ -3847,5 +4504,5 @@
     "prefer-lowest": false,
     "platform": [],
     "platform-dev": [],
-    "plugin-api-version": "1.1.0"
+    "plugin-api-version": "2.0.0"
 }
diff --git a/src/Adapter.php b/src/Adapter.php
index 0faaf24..381c9d5 100644
--- a/src/Adapter.php
+++ b/src/Adapter.php
@@ -35,18 +35,21 @@ public function savePolicyLine($ptype, array $rule)
         $this->table->save($entity);
     }
 
-    public function loadPolicy($model)
+    public function loadPolicy($model): void
     {
         $rows = $this->table->find();
 
         foreach ($rows as $row) {
             $array = $row->toArray();
+            $array = array_filter($array, function ($value) {
+                return !is_null($value) && $value !== '';
+            });
             $line = implode(', ', array_slice(array_values($array), 1));
             $this->loadPolicyLine(trim($line), $model);
         }
     }
 
-    public function savePolicy($model)
+    public function savePolicy($model): void
     {
         foreach ($model->model['p'] as $ptype => $ast) {
             foreach ($ast->policy as $rule) {
@@ -59,16 +62,14 @@ public function savePolicy($model)
                 $this->savePolicyLine($ptype, $rule);
             }
         }
-
-        return true;
     }
 
-    public function addPolicy($sec, $ptype, $rule)
+    public function addPolicy($sec, $ptype, $rule): void
     {
-        return $this->savePolicyLine($ptype, $rule);
+        $this->savePolicyLine($ptype, $rule);
     }
 
-    public function removePolicy($sec, $ptype, $rule)
+    public function removePolicy($sec, $ptype, $rule): void
     {
         $entity = $this->table->newEntity();
 
@@ -76,10 +77,10 @@ public function removePolicy($sec, $ptype, $rule)
             $entity->set('v'.strval($key), $value);
         }
 
-        return $this->table->delete($entity);
+        $this->table->delete($entity);
     }
 
-    public function removeFilteredPolicy($sec, $ptype, $fieldIndex, ...$fieldValues)
+    public function removeFilteredPolicy($sec, $ptype, $fieldIndex, ...$fieldValues) :void
     {
         throw new CasbinException('not implemented');
     }