Grails 域中的枚举

Question

我正在尝试在 Grails 2.1 域类中使用 enum。我正在通过grails generate-all <domain class> 命令生成控制器和视图，当我访问视图时，出现如下所示的错误。我在这里错过了什么？

错误

Failed to convert property value of type java.lang.String to required type 
com.domain.ActionEnum for property action; nested exception is 
java.lang.IllegalStateException: Cannot convert value of type 
[java.lang.String] to required type [com.domain.ActionEnum] for property action: 
no matching editors or conversion strategy found

枚举（在/src/groovy）

package com.domain

enum ActionEnum  {
    PRE_REGISTER(0), PURCHASE(2)

    private final int val
    public ActionEnum(int val) {
        this.val = val
    }

    int value() { return value }
}

域

package com.domain

class Stat {
    ActionEnum action

    static mapping = {
        version false
    }
}   

查看

<g:select name="action" 
    from="${com.domain.ActionEnum?.values()}"
    keys="${com.domain.ActionEnum.values()*.name()}" required="" 
    value="${xyzInstance?.action?.name()}"/>

---

编辑

更改以下内容后出现错误Property action must be a valid number。

查看

<g:select optionKey='id' name="action" 
from="${com.domain.ActionEnum?.values()}" 
required="" 
value="${xyzInstance?.action}"/>  // I tried simply putting a number here

枚举

package com.domain

enum ActionEnum  {
    PRE_REGISTER(0), PURCHASE(2)

    final int id
    public ActionEnum(int id) {
        this.id = id
    }

    int value() { return value }

    static ActionEnum byId(int id) {
        values().find { it.id == id }
    } 
}

域

package com.domain.site

class Stat {
    static belongsTo = Game;

    Game game
    Integer action

    static mapping = {
        version false
   }

    static constraints = {
        action inList: ActionEnum.values()*.id
    }

    String toString() {
        return "${action}"
    }
}

Answer 1

看这里...

Grails Enum Mapping

Grails GORM & Enums

你也可能会遇到这个问题。来自文档：

1) Enum 类型现在使用它们的 String 值而不是序数值进行映射。您可以通过如下更改映射来恢复旧行为：

static mapping = {
    someEnum enumType:"ordinal"
}