我正在尝试使用 enum
在 Grails 2.1 域类中。我正在通过 grails generate-all <domain class>
生成 Controller 和 View 命令,当我访问 View 时,出现如下所示的错误。我在这里缺少什么?
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
中)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 }
}
域名
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="${xyzInstance?.action?.name()}"/>
编辑
现在出现错误
Property action must be a valid number
更改以下内容后。查看
<g:select optionKey='id' name="action"
from="${com.domain.ActionEnum?.values()}"
required=""
value="${xyzInstance?.action}"/> // I tried simply putting a number here
枚举
package com.domain
enum ActionEnum {
PRE_REGISTER(0), PURCHASE(2)
final int id
public ActionEnum(int id) {
this.id = id
}
int value() { return value }
static ActionEnum byId(int id) {
values().find { it.id == id }
}
}
域名
package com.domain.site
class Stat {
static belongsTo = Game;
Game game
Integer action
static mapping = {
version false
}
static constraints = {
action inList: ActionEnum.values()*.id
}
String toString() {
return "${action}"
}
}
最佳答案
看看这里...
Grails Enum Mapping
Grails GORM & Enums
你也可能会遇到这个问题。从文档:
1) 枚举类型现在使用它们的字符串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"
}
关于grails - Grails 域中的枚举,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12046624/