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!

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