laravel中model字段的类型定义

在HasAttributes中的两段方法:

public function setAttribute($key, $value)
    {
        // First we will check for the presence of a mutator for the set operation
        // which simply lets the developers tweak the attribute as it is set on
        // the model, such as "json_encoding" an listing of data for storage.
        if ($this->hasSetMutator($key)) {
            $method = 'set'.Str::studly($key).'Attribute';

            return $this->{$method}($value);
        }

        // If an attribute is listed as a "date", we'll convert it from a DateTime
        // instance into a form proper for storage on the database tables using
        // the connection grammar's date format. We will auto set the values.
        elseif ($value && $this->isDateAttribute($key)) {
            $value = $this->fromDateTime($value);
        }

        if ($this->isJsonCastable($key) && ! is_null($value)) {
            $value = $this->castAttributeAsJson($key, $value);
        }

        ………………
    }


protected function isJsonCastable($key)
    {
        return $this->hasCast($key, ['array', 'json', 'object', 'collection']);
    }

protected function castAttributeAsJson($key, $value)
    {
        $value = $this->asJson($value);

        if ($value === false) {
            throw JsonEncodingException::forAttribute(
                $this, $key, json_last_error_msg()
            );
        }

        return $value;
    }

  

protected function castAttribute($key, $value)
    {
        if (is_null($value)) {
            return $value;
        }

        switch ($this->getCastType($key)) {
            case 'int':
            case 'integer':
                return (int) $value;
            case 'real':
            case 'float':
            case 'double':
                return (float) $value;
            case 'string':
                return (string) $value;
            case 'bool':
            case 'boolean':
                return (bool) $value;
            case 'object':
                return $this->fromJson($value, true);
            case 'array':
            case 'json':
                return $this->fromJson($value);
            case 'collection':
                return new BaseCollection($this->fromJson($value));
            case 'date':
                return $this->asDate($value);
            case 'datetime':
                return $this->asDateTime($value);
            case 'timestamp':
                return $this->asTimestamp($value);
            default:
                return $value;
        }
    }

  所以,只需要在model中定义$casts数组,例如:

protected $casts = [
        'personal_access_client' => 'bool',
        'password_client' => 'bool',
        'revoked' => 'bool',
    ];

  存:

  laravel会通过在通过casts中定义的类型对接收的数据进行验证,然后通过第一段方法,转为相应的类型存到数据库。

  取:

  通过第二段方法将数据库中查出的数据转为casts数组中定义的类型,在返回出来。

 

  强大!

posted @ 2017-07-05 17:01  牛奶无花果  阅读(629)  评论(0编辑  收藏  举报