CakePHP - 在模型中设置默认字段值 [英] CakePHP - Set Default Field Values in the Model

问题描述

如何为模型中的字段设置默认值?

How do you set a default value for a field in a model?

我已按照建议尝试使用 _schema 的方法，但未使用默认值.

I have tried the method using _schema as suggested, but the default value is not being used.

public $_schema = array(
    'newsletter' => array(
        'default' => 1
    ),
);  

推荐答案

您可以在数据库中设置值并在模式中对其进行管理，例如:

You can set the value in database and get it managed in schema, e.g.:

public $items = array(
    'id' => array('type' => 'integer', 'null' => false, 'default' => null, 'length' => 10, 'unsigned' => false, 'key' => 'primary'),
    'quantity' => array('type' => 'decimal', 'null' => false, 'default' => '1.00', 'length' => '12,2', 'unsigned' => false),
    //                                                        ^^^^^^^^^^^^^^^^^^^
    'indexes' => array(
        'PRIMARY' => array('column' => 'id', 'unique' => 1),
    ),
    'tableParameters' => array('charset' => 'utf8', 'collate' => 'utf8_spanish_ci', 'engine' => 'InnoDB')
);

这个默认值可以稍后通过模型的schema属性在模型或控制器中读取:

This default value can be read later in model or controller though the model's schema property:

// Controller example
$itemSchema = $this->Item->schema();
$defaultQuantity = $itemSchema['quantity']['default'];
// ... or:
$quantityInfo = $this->Item->schema('quantity');
$defaultQuantity = $quantityInfo['default'];

在最近的 PHP 版本中，它可以是单行的:

In recent PHP versions it can be a one-liner:

$defaultQuantity = $this->Item->schema('quantity')['default'];

这适用于带有 MySQL 适配器的 Cake/2.5(不知道其他场景).

This works in Cake/2.5 with MySQL adapter (no idea of other scenarios).

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