[opencms-dev] How to add a relation

[Paul-Inge Flakstad]

Hi Michael,

Thanks for your reply, it helped me understand the behaviour. I had already read your presentation 
(that's actually why I put a shout-out to you, mentioning your name in my previous mail), but I 
couldn't seem to extract this difference in weak and strong links from it.

Like I explained, I've tried to put an annotation in my XSD, defining the image link as strong, but 
since the image container (where the VfsFile element is) and it's parent container are both optional, 
I get an error stating:

	"XML content value "Paragraph/Image/URI" used for this check rule is not optional."

when I try to create a new resource of the type in question. 

So, is there any way to get around this? Is it possible to set xmlcontent relations to be 
strong by default, for example..?

Also, if you or anybody else knows about any tutorial or how-to on defining custom relations, please
let me know. :)

Cheers,
- Paul

> -----Original Message-----
> From: opencms-dev-bounces at opencms.org 
> [mailto:opencms-dev-bounces at opencms.org] On Behalf Of Michael Moossen
> Sent: 20. august 2009 16:27
> To: The OpenCms mailing list
> Subject: Re: [opencms-dev] How to add a relation
> 
> Hi Paul-Inge!
> 
> Yes, this is the intented behaviour.
> 
> The keyword here is relation type, which can be weak or strong.
> 
> "related resources" are strong relations and xmlcontent 
> relations are by 
> default weak.
> 
> for more details see:
> http://opencms.org/export/sites/opencms/en/events/opencms_days
> _2008/slides/T2_MichaelMoossen.pdf
> 
> -------------------
> Michael Moossen
> 
> Alkacon Software GmbH  - The OpenCms Experts
> http://www.alkacon.com - http://www.opencms.org
> 
> Paul-Inge Flakstad schrieb:
> > I've gotten no answers on this question, so I'm just 
> posting an update.
> >  
> > I don't get how the CRE is supposed to work. Seems to me that 
> > it actually doesn't work like it's supposed to(?). I've got 
> a structured 
> > content type, which is a just a type of general page. It nests 
> > paragraphs which in turn nests image containers (where you 
> > can VfsFile-link to the image). Pretty straightforward, 
> nothing special.
> >  
> > If I add a picture to the page, save, and then look at the 
> relations 
> > using the context menu's "Link relations to/from", I can see the 
> > relation between the page and the image just fine. So a relation 
> > has definitively been established.
> >  
> > But when I try to publish the page "with related 
> resources", the system 
> > apparently fails to recognize the relation, as no image 
> file appears in 
> > the publish list, only the page itself... WHY? The relation 
> clearly exists!
> >  
> >  
> > I've tried other approaches to try to force the behaviour I want:
> >  
> > Tried to manually add a relation using a simple .jsp that calls 
> > addRelationToResource. However, I was only able to add the types 
> > CATEGORY and OU_RESOURCE. All the other types caused 
> > IllegalArgumentExceptions. And still, "publish with related 
> resources" 
> > did not include the image when trying to publish the general page.
> >  
> > Tried to Add the relation in the XSD, but that didn't work 
> either (some 
> > elements are optional, which caused this approach to produce mostly 
> > errors when trying to create new general pages).
> >  
> >  
> > Can anybody shed some light on why the "publish with 
> related resources" 
> > behaves like this? Is it a configuration issue?
> > Also, I would still like to see an example on how to 
> programatically add 
> > a new relation between two resources (and how to define a 
> new type of 
> > relation).
> >  
> > Anyone? (Michael Moossen..? :) )
> >  
> >  
> > All the best,
> > Paul
> > 
> >     
> --------------------------------------------------------------
> ----------
> >     *From:* opencms-dev-bounces at opencms.org
> >     [mailto:opencms-dev-bounces at opencms.org] *On Behalf Of 
> *Paul-Inge
> >     Flakstad
> >     *Sent:* 13. august 2009 20:40
> >     *To:* opencms-dev at opencms.org
> >     *Subject:* [opencms-dev] How to add a relation
> > 
> >     Hi everyone
> >      
> >     I'm trying to programatically add a relation between 
> two resources,
> >     and things are not going so well.
> >      
> >     What I want to do is establish a relation between an xmlcontents
> >     type resource (structured content) and an image resource, so
> >     that the image gets published when the xmlcontents file 
> is published
> >     with related resources. This is actually quite 
> important, because
> >     many editors forget to publish images, resulting in an 
> error message
> >     for any user who's not logged in... 
> >      
> >     I'm putting my code inside a Java class method that creates the
> >     image (thumbnail) resource. When using the call like this (tried
> >     other CmsRelationTypes as well, same result):
> >     cmso.addRelationToResource("/en/index.html",
> >     "/images/thumbs/image.jpg", CmsRelationType.JSP_WEAK.getName());
> >      
> >     I get the following error:
> >     Error while adding a relation from resource "/en/index.html" to
> >     resource "/images/thumbs/image.jpg" with type "JSP_WEAK".
> >      
> >     Can anyone tell me what I'm doing wrong - and/or show 
> me how it's done?
> >      
> >     Cheers,
> >     Paul
> > 
> > 
> > 
> --------------------------------------------------------------
> ----------
> > 
> > 
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