将字段设置为 null 时出现有关长度的意外学说验证错误
我有一个定义如下的字段：
class Subcategory extends BaseSubcategory {}
abstract class BaseSubcategory extends Doctrine_Record
{
public function setTableDefinition()
{
// ...
$this->hasColumn('meta_description', 'string', 255);
// ...
}
// ...
}
这是表格的样子：
mysql> DESCRIBE subcategory;
+----------------------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------------------+------------------+------+-----+---------+----------------+
| id | int(10) unsigned | NO | PRI | NULL | auto_increment |
[...]
| meta_description | varchar(255) | YES | | NULL | |
[...]
+----------------------+------------------+------+-----+---------+----------------+
10 rows in set (0.00 sec)
这是我保存记录的代码
$m = new Subcategory;
// ...
$m->meta_description = null;
$m->save();
我收到以下验证错误
* 1 validator failed on meta_description (length)
为什么会发生这种情况？
I have a field that is defined as follows:
class Subcategory extends BaseSubcategory {}
abstract class BaseSubcategory extends Doctrine_Record
{
public function setTableDefinition()
{
// ...
$this->hasColumn('meta_description', 'string', 255);
// ...
}
// ...
}
Here's what the table looks like:
mysql> DESCRIBE subcategory;
+----------------------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------------------+------------------+------+-----+---------+----------------+
| id | int(10) unsigned | NO | PRI | NULL | auto_increment |
[...]
| meta_description | varchar(255) | YES | | NULL | |
[...]
+----------------------+------------------+------+-----+---------+----------------+
10 rows in set (0.00 sec)
Here's my code to save a record
$m = new Subcategory;
// ...
$m->meta_description = null;
$m->save();
I'm getting the following validation error
* 1 validator failed on meta_description (length)
Why is this happening?
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上面的代码示例并没有说明全部情况。我被早期的保存误导了，其中 meta_description 字段超载了超过 255 个字符。虚惊！
The code samples above do not tell the whole story. I was being misled by an earlier save, in which the meta_description field was being overloaded with over 255 characters. False alarm!