Symfony2 表单将空白字符串解释为空值 [英] Symfony2 forms interpret blank strings as nulls

问题描述

我有一个包含多个字段的 Symfony2 表单，包括一个名为 recap 的可选文本字段.

I have a Symfony2 form with a variety of fields, including one optional text field called recap.

这个 recap 字段在其中有一些文本时可以完美保存，但是当该字段留空时，我收到此错误:

This recap field saves perfectly when there's some text in it, but when the field is left blank, I get this error:

SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'recap' cannot be null

没错 - recap 列不能为 null.我是故意这样设置的.Null 表示未知.当用户将recap留空时，recap的值不是未知的；它是空白的.

That's right - the column recap can't be null. I set it that way on purpose. Null means unknown. When the user leaves recap blank, the value of recap is not unknown; it's blank.

我的问题是如何让 Symfony 在空白时将 recap 保存为 ''，而不是 null.

My question is how to get Symfony to save recap as '' when it's blank, not null.

推荐答案

转到您的实体并转到变量的声明.

Go to your Entity and go to the declaration of the variables.

/**
 * @var string $name
 *
 * @ORM\Column(type="string", length=50)
 */
public $recap = '';

您可以为 $recap 指定一个默认值.

you can assign a default value for $recap.

或者，当您拥有 setRecap 函数时，您可以检查是否为空或未设置并设置您期望的值.

Or otherway when you have the function setRecap you can check if empty or not set and set the value you expect.

public function setRecap($recap) {
   $this->recap = !isset($recap) ? '': $recap;
}

或者您将表单类型中的默认值设置为 '' 但我认为这不是您所期望的.

Or you set the default Value in your form Type to '' but i think then its not what you expect.

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