diff --git a/README.md b/README.md
index 6e3a03c..d7304fb 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ Then run `php artisan migrate` and the following _5_ tables will be created:
 * roles
 * roles_permissions
 * users_permissions
-* users_roles
+* role_user
 
 Creating the __CRUD__ and populating thoses tables is up to you.
 
diff --git a/migrations/2017_02_05_092446_create_permissions_table.php b/migrations/2017_02_05_092446_create_permissions_table.php
index 340d216..d0b8503 100644
--- a/migrations/2017_02_05_092446_create_permissions_table.php
+++ b/migrations/2017_02_05_092446_create_permissions_table.php
@@ -15,7 +15,7 @@ public function up()
     {
         Schema::create('permissions', function (Blueprint $table) {
             $table->increments('id');
-            $table->string('name');
+            $table->string('name')->unique();
             $table->timestamps();
         });
     }
diff --git a/migrations/2017_02_05_093559_create_role_user_table.php b/migrations/2017_02_05_093559_create_users_roles_table.php
similarity index 79%
rename from migrations/2017_02_05_093559_create_role_user_table.php
rename to migrations/2017_02_05_093559_create_users_roles_table.php
index f860732..25d3d6d 100644
--- a/migrations/2017_02_05_093559_create_role_user_table.php
+++ b/migrations/2017_02_05_093559_create_users_roles_table.php
@@ -4,7 +4,7 @@
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Database\Migrations\Migration;
 
-class CreateRoleUserTable extends Migration
+class CreateUsersRolesTable extends Migration
 {
     /**
      * Run the migrations.
@@ -13,8 +13,7 @@ class CreateRoleUserTable extends Migration
      */
     public function up()
     {
-        Schema::create('role_user', function (Blueprint $table) {
-            $table->increments('id');
+        Schema::create('users_roles', function (Blueprint $table) {
             $table->integer('user_id')->unsigned()->index();
             $table->integer('role_id')->unsigned()->index();
             $table->timestamps();
@@ -22,7 +21,7 @@ public function up()
             $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
             $table->foreign('role_id')->references('id')->on('roles')->onDelete('cascade');
 
-            $table->unique(['user_id', 'role_id']);
+            $table->primary(['user_id', 'role_id']);
         });
     }
 
diff --git a/src/HasRolesAndPermissions.php b/src/HasRolesAndPermissions.php
index 3ee895b..3ac5557 100644
--- a/src/HasRolesAndPermissions.php
+++ b/src/HasRolesAndPermissions.php
@@ -14,16 +14,8 @@ trait HasRolesAndPermissions
      * @param  Denismitr\Permissions\Models\Permission|string  $permission
      * @return bool
      */
-    public function hasPermissionTo($permission)
+    public function hasPermissionTo(string $permission)
     {
-        if (is_string($permission)) {
-            $permission = Permission::where('name', $name);
-        }
-
-        if (! $permission) {
-            return false;
-        }
-
         return $this->hasPermissionThroughRole($permission) || $this->hasPermission($permission);
     }
 
@@ -34,20 +26,18 @@ public function hasPermissionTo($permission)
      */
     public function givePermissionTo(...$permissions)
     {
-        $permissions = $this->getAllPermissions(array_flatten($permissions));
-
-        if ($permissions === null) {
-            return $this;
-        }
-
         foreach ($permissions as $key => $permission) {
             if ($this->hasPermissionTo($permission)) {
                 unset($permissions[$key]);
+            } else {
+                $permissions[$key] = Permission::fromName($permission);
             }
         }
 
         $this->permissions()->saveMany($permissions);
 
+        $this->load('permissions');
+
         return $this;
     }
 
@@ -58,11 +48,12 @@ public function givePermissionTo(...$permissions)
      */
     public function grantAllPermissions()
     {
-        $permission = new Permission;
-        $permission->name = 'all';
+        $permission = Permission::fromName('all');
 
         $this->permissions()->saveMany([$permission]);
 
+        $this->load('permissions');
+
         return $this;
     }
 
@@ -119,32 +110,40 @@ public function hasRole(...$roles)
         return false;
     }
 
-
+    /**
+     *  Get roles of the user
+     *
+     * @return Illuminate\Database\Eloquent\Relations\BelongsToMany
+     */
     public function roles()
     {
-        return $this->belongsToMany(Role::class);
+        return $this->belongsToMany(Role::class, 'users_roles');
     }
 
-
+    /**
+     *  Get permissions for user
+     *
+     * @return Illuminate\Database\Eloquent\Relations\BelongsToMany
+     */
     public function permissions()
     {
         return $this->belongsToMany(Permission::class, 'users_permissions');
     }
 
-    protected function hasPermissionThroughRole(Permission $permission)
+    protected function hasPermissionThroughRole(string $permission)
     {
-        foreach ($permission->roles as $role) {
-            if ($this->roles->contains($role)) {
-                return true;
-            }
-        }
+        // foreach ($permission->roles as $role) {
+        //     if ($this->roles->contains($role)) {
+        //         return true;
+        //     }
+        // }
 
         return false;
     }
 
-    protected function hasPermission(Permission $permission)
+    protected function hasPermission(string $permission)
     {
-        return (bool) $this->permissions->where('name', $permission->name)->count();
+        return (bool) $this->permissions->where('name', $permission)->count();
     }
 
     protected function getAllPermissions(array $permissions)
diff --git a/src/Models/Permission.php b/src/Models/Permission.php
index 71fb22e..e77d7a9 100644
--- a/src/Models/Permission.php
+++ b/src/Models/Permission.php
@@ -12,4 +12,12 @@ public function roles()
     {
         return $this->belongsToMany(Role::class, 'roles_permissions');
     }
+
+
+    public static function fromName($name)
+    {
+        return self::updateOrCreate([
+            'name' => $name
+        ]);
+    }
 }