Refactored Permission class.

Permission.php

<?php

class Permission  {
    
    public static function ask()
    {
        return static::action('Question');
    }

    public static function answer()
    {
        return static::action('Answer');
    }

    public static function vote()
    {
        return static::action('Vote');
    }

    public static function denounce()
    {
        return static::action('Denounce');
    }

    /**
    * Check if the user has permission to perform an action today.
    *
    * @param  string     $model
    * @param  string     $field
    * @return boolean
    */
    private static function action($model, $field = '')
    {
        $limit_per_day = static::query_action_limit(Session::get('ULVL'), $model,  $field);
        
        $user_did_today = static::query_user_actions_today(Session::get('UID'), $model)->count();

        return $limit_per_day - $user_did_today > 0;
    }

    /**
    *
    * Query the $model and get the limit for one day. If $field isn't
    * provided, assume a lower-cased-pluralized version of $model.
    *
    * @param  int      $level
    * @param  string   $model
    * @param  string   $field
    * @return int
    */
    private static function query_action_limit($level, $model, $field = '')
    {
        $field = (empty($field)) ? strtolower(Str::plural($model)) : $field;

        return Permissionslevel::where_level($level)->first()->$field;
    }

    /**
    * Get the actions performed by the user today
    *
    * @param  int      $user_id
    * @param  string   $model
    * @return Laravel\Query
    */
    private static function query_user_actions_today($user_id, $model)
    {
        return $model::where_user_id($user_id)
                                 ->where('created_at', '>', date('Y-m-d') . ' 00:00:00')
                                 ->where('created_at', '<', date('Y-m-d') . ' 23:59:59');
    }



    private static function choose_best_answer()
    {
        //list($count_limit_day,$count_did_today) = self::query('Vote','votes');

        //$count_did_today = Answer::where('choosed', '=', '1')->where('created_at', '>', date('Y-m-d') . ' 00:00:00')->where('created_at', '<', date('Y-m-d') . ' 23:59:59')->question_id;
        //$count_did_todayA = $count_did_today-> 
        $count_limit_day = Permissionslevel::where('level', '=', Session::get('ULVL'))->first()->best_answers;

        if($count_limit_day - $count_did_today > 0) {
           return true;
        }
        else {
            return false;
        }
    }
}