1) MongoCategoryTest::testValidationUniqueId

ErrorException: Undefined index: result

/var/www/leaf/vendor/jenssegers/mongodb/src/Jenssegers/Mongodb/Builder.php:151
/var/www/leaf/vendor/laravel/framework/src/Illuminate/Database/Query/Builder.php:1005
/var/www/leaf/vendor/jenssegers/mongodb/src/Jenssegers/Mongodb/Builder.php:230
/var/www/leaf/vendor/laravel/framework/src/Illuminate/Database/Query/Builder.php:1311
/var/www/leaf/vendor/laravel/framework/src/Illuminate/Validation/DatabasePresenceVerifier.php:57
/var/www/leaf/vendor/laravel/framework/src/Illuminate/Validation/Validator.php:759
/var/www/leaf/vendor/laravel/framework/src/Illuminate/Validation/Validator.php:264
/var/www/leaf/vendor/laravel/framework/src/Illuminate/Validation/Validator.php:225
/var/www/leaf/vendor/laravel/framework/src/Illuminate/Validation/Validator.php:239
/var/www/leaf/app/models/BaseModelMongo.php:35

    /**
     * Take some data and validate again model rules
     *
     * @param   array    data for validation      
     * @return  boolean  result
     */
    public function validate($data)
    {
        // make a new validator object
        $v = Validator::make($data, $this->rules);

        // check for failure
        if ($v->fails())
        {
            // set errors and return error message
            $this->errors = $v->messages();
            return false;
        }

        // validation pass
        return true;
    }

    protected $rules = array(
        'id' => 'unique:collection|min:1',
        'slug' => 'unique:collection|min:1|max:64',
        'name' => 'min:1|max:256',
    );