> This is pretty much what I was looking to do, except that I was hoping > struts2 could automatically remove an object if *all* of it's properties were > null, not just one. Would your answer be the same given this minor > difference?
This is actually not a question whether struts2 can do but whether OGNL can do it. OGNL is the expression language that struts 2 uses to navigate the object network. -Maybe it works if you write your own OGNL PropertyAccessor (http://www.opensymphony.com/ognl/html/DeveloperGuide/propertyAccessors.html). -I read that struts 2.1 will make the Expression Language plugable. Maybe different language works your way or is more easily extendable. But booth these solutions are nontrivial. Maybe there is a better way hidden in the OGNL Documentaion: Language Guide: http://www.opensymphony.com/ognl/html/LanguageGuide/index.html Developer Guide: http://www.opensymphony.com/ognl/html/DeveloperGuide/index.html /Stephan -------- Original-Nachricht -------- > Datum: Thu, 21 Aug 2008 11:36:47 +0100 > Von: "Gawain Hammond" <[EMAIL PROTECTED]> > An: "Struts Users Mailing List" <user@struts.apache.org> > Betreff: RE: [S2] Does struts set null values for pojo fields? > Thanks very much for your reply. > > The problem with this type of work around is that it completely messes up > my fiendish master plan. If it wasn't for those pesky objects with null > values! :-P > > You see, I've probably been a bit too clever for my own good, and for the > first time I've created a single action, a single service, and single dao > to persist objects submitted from multiple struts forms. I'm currently > persisting about 20 domain objects this way, and this is the last issue I need > to solve to get it all working as desired. > > This issue is a pretty common occurrence in my domain model, so I'd have > to write code to check for null values in many places for every domain > object. I've been thinking this problem would be best solved either in the > struts/view layer, or maybe the persistence layer. I'm spreading myself a bit > thin trying to work it out at both ends at the same time :-) > > If you don't mind, I have one last question: You said: > > "I think you cann't expect Struts 2 to automatically remove an object just > because one of it's properties is set to null." > > This is pretty much what I was looking to do, except that I was hoping > struts2 could automatically remove an object if *all* of it's properties were > null, not just one. Would your answer be the same given this minor > difference? > > > > -----Original Message----- > From: "Stephan Schröder" [mailto:[EMAIL PROTECTED] > Sent: 21 August 2008 09:10 > To: Struts Users Mailing List > Subject: Re: [S2] Does struts set null values for pojo fields? > > I think you cann't expect Struts 2 to automatically remove an object just > because one of it's properties is set to null. Ok, in your case it's the > id-property but struts 2 (or better OGNL) doesn't know that. > So i don't think this is worth a feature request. > But here is the workaround i'd use: > use the prepare-Interceptor after params and set group to null if the ID > is null in the prepare method. That way the execute method stays a simple > "persist( user );return SUCCESS;". > > /Stephan > > > <s:select label="Group" headerKey="" > > headerValue="-- None --" > > name="user.group.id" > > value="%{user.group.id}" > > list="%{#groupAction.list}" > > listKey="id" listValue="name" > > /> > > > > > > Does anyone know if this can be done? Can I configure struts to set > > user.group as null rather than create an empty Group object if no > > id/value has been specified in the drop down select box? > > > > Is this something that is working as desired, and I'm the one who needs > > to change? Or does struts maybe needs a new feature request in jira? > -- > Ist Ihr Browser Vista-kompatibel? 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