游戏框架-如何使游戏接受“空"游戏? yaml文件中的值? [英] play framework - how can I make play accept "null" values in yaml files?

问题描述

我正在尝试从YAML文件中加载数据，其中某些字段包含空"值.当Play Framework尝试解析空"值时，将引发以下异常:

I am trying to load data from a YAML file where some fields contain "null" values. Play Framework throws the following exception when it tries to parse a "null" value:

"play.exceptions.YAMLException: null; mapping values are not allowed here".

以下是我尝试导入的数据的示例:

The following is a sample of the data I am trying to import:

person(0)
  name:F1
  father:

和模型:

    public class Person extends Model {

    public String name;

    public Long father;
}

您可以从数据样本中看到父亲"字段具有空"值.父亲字段是另一个人的"ID".如何让Play接受?

You can see from the data sample that the "father" field has a "null" value. The father field is an "ID" to another person. How can I make Play accept it?

P.S:出于技术原因，我将父亲"字段的数据类型设置为长"，所以请不要建议我将其设置为人"类型.

P.S: I have the "father" field as data type "Long" for technical reasons, so please don't advice me to make it a "Person" type.

推荐答案

只需将其保留在yaml文件之外. 例如，这应该可以工作

Just leave it out of the yaml file. e.g this should work

person(0)
  name:F1

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