Grails数据绑定 - 带有列表的命令对象 [英] Grails data binding - command objects with Lists
问题描述
Grails 1.3.7
数据绑定遇到麻烦带有列表内容的Command对象。示例命令:
class Tracker {
字符串名称
字符串描述
List< Unit> units = new ArrayList()
}
class Unit {
String name
Long unitMax
Long unitMin
}
为追踪器创建GSP具有单位字段。例如:
< g:textField name =units [0] .unitMaxvalue =/>
TrackerController保存方法:
def save = {Tracker trackerInstance - >
trackerInstance = trackingService.saveOrUpdateTracker(trackerInstance)
}
但是,总是java .lang.IndexOutOfBoundsException
或者,如果我将控制器更新为:
def save = {
Tracker trackerInstance = new Tracker()
trackerInstance.properties = params
....
然后groovy.lang.ReadOnlyPropertyException:无法设置只读属性:类的属性:com.redbrickhealth.dto.Tracker
任何想法?
GORM与Command对象的绑定似乎有所不同。
也许我需要扩展并注册PropertyEditorSupport for Unit?
-Todd
Grails需要一个带有现有列表的命令,它将充满来自请求的数据。
如果你知道确切的单位数,比如3,你可以:
class Tracker {
字符串名称
字符串描述
List< Unit>单位= [新单位(),新单位(),新单位()]
}
或从apache commons集合中使用LazyList
import org.apache.commons.collections.ListUtils
import org。 apache.commons.collections.Factory $ b $ class Tracker {
字符串名称
字符串描述
List< Unit> units = ListUtils.lazyList([],{new Unit()} as Factory)
}
Grails 1.3.7
Trouble with data binding Command objects that have List content. Example Command:
class Tracker {
String name
String description
List<Unit> units = new ArrayList()
}
class Unit {
String name
Long unitMax
Long unitMin
}
create GSP for Tracker has the Unit fields. One example:
<g:textField name="units[0].unitMax" value=""/>
TrackerController save method:
def save = { Tracker trackerInstance ->
trackerInstance = trackingService.saveOrUpdateTracker(trackerInstance)
}
But, always java.lang.IndexOutOfBoundsException
Alternatively, if I update controller to:
def save = {
Tracker trackerInstance = new Tracker()
trackerInstance.properties = params
....
Then groovy.lang.ReadOnlyPropertyException: Cannot set readonly property: properties for class: com.redbrickhealth.dto.Tracker Any ideas?
There seems to be a difference between binding in GORM vs Command objects.
Maybe I need to extend and register a PropertyEditorSupport for Unit?
-Todd
Grails requires an command with existing list, that will be filled with data from reques.
If you know exact number of units, say 3, you can:
class Tracker {
String name
String description
List<Unit> units = [new Unit(), new Unit(), new Unit()]
}
or use LazyList from apache commons collections
import org.apache.commons.collections.ListUtils
import org.apache.commons.collections.Factory
class Tracker {
String name
String description
List<Unit> units = ListUtils.lazyList([], {new Unit()} as Factory)
}
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