[flexcoders] Dot notation to access objects inside a datagrid column
Hi FlexCoders:
Coming from a Java background, I was surprised that the dot operator is
not working as I expected.
The array with the data structure and children is populated from the
(Hibernate) data source at creationComplete time with:
ds.fill(users, all.users, []);
The array collection is declared via:
mx:ArrayCollection id=users /
and then used inside the datagrid ...
mx:DataGrid id=dgrid dataProvider={users} editable=false
mx:columns
mx:DataGridColumn headerText=User ID dataField=id/
mx:DataGridColumn headerText=First Name dataField=firstName/
mx:DataGridColumn headerText=Last Name dataField=lastName/
mx:DataGridColumn headerText=Group dataField=userGroup.name/
/mx:columns
/mx:DataGrid
Unfortunately the dot-access to the related user group name seems not to
work, there is just nothing being displayed. If dataField=userGroup then
there is [object UserGroup] displayed inside the datagrid column.
So how do you retrieve the properties of the related user group object?
Thanks for your help,
Niko
PS: The classes for value objects look very straight-forward:
// User.as
package com.example.flex
{
[Managed]
[RemoteClass(alias=com.example.flex.User)]
public class User
{
public var id:Number;
public var firstName:String = ;
public var lastName:String = ;
public var userGroup:UserGroup;
public function User() {
}
}
}
// UserGroup.as
package com.example.flex
{
[Managed]
[RemoteClass(alias=com.example.flex.UserGroup)]
public class UserGroup
{
public var id:Number;
public var name:String = ;
public function UserGroup() {
}
}
}
[flexcoders] FDS: Using Hibernate second-level cache possible?
Hi together, As a newbie I would like to get your advices on how to use the Hibernate caching for Flex Data Management Services. Is this possible at all or a contra-diction to the HibernateAssembler? For my java applications I currently use second-level caching to speed up data access with Hibernate (3.2), which I would also like to use for my Flex app: For this I use in the Hibernate mapping definition (inside the class element): cache usage=read-write/ Unfortunately if I turn EhCache on (via the hibernate configuration) ... property name=cache.provider_classorg.hibernate.cache.EhCacheProvider/property ... the tomcat logs show an ugly stack-trace: CacheException: Attempt to restart an already started EhCacheProvider. See below for the exception in its full-length beauty. The only way to overcome this, to avoid caching at all by setting: property name=cache.provider_classorg.hibernate.cache.NoCacheProvider/property (Also using the recommended SingletonEhCacheProvider does not help) Any help much appreciated. Thanks, Niko 2006-12-05 08:57:08,737 [main] ERROR org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/useradmin] - Servlet /useradmin threw load() exception java.lang.ExceptionInInitializerError at flex.data.assemblers.HibernateManager.createSessionFactory(HibernateManager.java:66) at flex.data.assemblers.HibernateManager.init(HibernateManager.java:44) at flex.data.assemblers.HibernateAssembler.initialize(HibernateAssembler.java:137) at flex.messaging.factories.JavaFactory$JavaFactoryInstance.createInstance(JavaFactory.java:254) at flex.messaging.factories.JavaFactory.createFactoryInstance(JavaFactory.java:93) at flex.messaging.FactoryDestination.getFactoryInstance(FactoryDestination.java:76) at flex.data.adapters.JavaAdapter.server(JavaAdapter.java:158) at flex.data.adapters.JavaAdapter.setSettings(JavaAdapter.java:119) at flex.messaging.Destination.createAdapter(Destination.java:279) at flex.messaging.Destination.initDestination(Destination.java:103) at flex.messaging.FactoryDestination.initDestination(FactoryDestination.java:58) at flex.data.DataService.createDestination(DataService.java:90) at flex.messaging.services.AbstractService.createDestinations(AbstractService.java:82) at flex.messaging.config.MessagingConfiguration.createServices(MessagingConfiguration.java:187) at flex.messaging.config.MessagingConfiguration.configureBroker(MessagingConfiguration.java:84) at flex.messaging.MessageBrokerServlet.init(MessageBrokerServlet.java:105) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1105) at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:932) at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3951) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4225) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524) at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:608) at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:535) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:470) at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1122) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:310) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1021) at org.apache.catalina.core.StandardHost.start(StandardHost.java:718) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442) at org.apache.catalina.core.StandardService.start(StandardService.java:450) at org.apache.catalina.core.StandardServer.start(StandardServer.java:709) at org.apache.catalina.startup.Catalina.start(Catalina.java:551) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432) Caused by: org.hibernate.cache.CacheException: Attempt to restart an already started EhCacheProvider. Use sessionFactory.close() between repeated calls to buildSessionFactory. Consider using net.sf.ehcache.hibernate.SingletonEhCacheProvider. at
