topic Re: Retrieving associations over CMIS in Alfresco Archive

Retrieving associations over CMIS

gehriga — Wed, 25 Nov 2009 10:45:04 GMT

Hi there,right now I'm trying to build an application based on Alfresco, connected over its CMIS API.My current problem while testing the API is following:How can I retrieve a (child-)association of a document via CMIS? I'm able to retrieve properties, child documents of folders, but no associations

Re: Retrieving associations over CMIS

jpotts — Wed, 25 Nov 2009 17:20:47 GMT

I had the same problem until David Caruana pointed me in the right direction.

Try this:

http://localhost:8080/alfresco/service/cmis/s/workspacepacesStore/i/845410d9-03de-4595-a71d-86854ba09e0d/rels?includeSubRelationshipTypes=true

The problem is that CMIS is only giving you back relationships of type "cmis:relationship". All custom relationships are sub-types of cmis:relationship, but the default for includeSubRelationshipTypes is false.

Jeff

Re: Retrieving associations over CMIS

gehriga — Thu, 26 Nov 2009 08:42:54 GMT

Thanks for your quick reply Jeff,
but unfortunately an empty list is returned, no matter whether I add includeSubRelationshipTypes=true or not.
Is the association defined correctly?
The linked document is both child of a folder and now child(-association) of my main document. Could that be decisive?
Therefore, the source-part of the association-definition has changed, as the linked document has two parents, not one:

<child-association name="hits:DownloadTeaser:Headline">
 <title>Headline</title>
 <source>
  <mandatory>false</mandatory>
  <many>true</many>
 </source>
 <target>
  <class>hits:binaryLanguageContent</class>
  <mandatory>false</mandatory>
  <many>false</many>
 </target>
</child-association>‍‍‍‍‍‍‍‍‍‍‍‍

For completeness, here's what is returned:

<?xml version="1.0" encoding="UTF-8"?>
<feed xmlns="http://www.w3.org/2005/Atom" xmlns:app="http://www.w3.org/2007/app" xmlns:cmisra="http://docs.oasis-open.org/ns/cmis/restatom/200908/" xmlns:cmis="http://docs.oasis-open.org/ns/cmis/core/200908/" xmlns:alf="http://www.alfresco.org" xmlns:opensearch="http://a9.com/-/spec/opensearch/1.1/">
<author><name>admin</name></author>
<generator version="3.2.0 (r2 2440)">Alfresco (Community)</generator>
<icon>http://localhost:8080/alfresco/images/logo/AlfrescoLogo16.ico</icon>
<id>urn:uuid:c609a1bc-5b80-41fa-841f-43c7c0928dce-relationships</id>
<link rel="service" href="http://localhost:8080/alfresco/service/cmis'/>
<link rel="self" href="http://localhost:8080/alfresco/service/cmis/s/workspace:SpacesStore/i/c609a1bc-5b80-41fa-841f-43c7c0928dce/rels?includeSubRelationshipTypes=true'/>
<link rel="via" href="http://localhost:8080/alfresco/service/cmis/s/workspace:SpacesStore/i/c609a1bc-5b80-41fa-841f-43c7c0928dce'/>
<title>DownloadTeaser Relationships</title>

<updated>2009-11-26T09:15:09.846+01:00</updated>
<opensearch:totalResults>0</opensearch:totalResults>
<opensearch:startIndex>0</opensearch:startIndex>
<opensearch:itemsPerPage>-1</opensearch:itemsPerPage>
<cmisra:numItems>0</cmisra:numItems>
</feed>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

In the Alfresco Node Browser the child-relationship is shown correctly.
Any idea?

Re: Retrieving associations over CMIS

gehriga — Thu, 26 Nov 2009 08:54:48 GMT

ok, new situation.
Obviously your hint belongs to a "normal" association. Here the additional parameter gives me the correct list of linked documents.
But what about child-associations? They are not in the list of relationships, and there is no working url for getting children of a non-folder document.

Thanks in advance!

Re: Retrieving associations over CMIS

gehriga — Tue, 15 Dec 2009 10:30:08 GMT

Hi there,

meanwhile I refrained from using child associations for my project.
In my structure of document types I'm using "normal" relations betweens documents. Now I'm trying to discover possible relations on the startup of my application. I'm able to find all possible properties for a certain type by using the script at /alfresco/service/cmis/{typeid}. But there are no associations listed.
Is there any possibilty to discover possible relationships for a certain type?

Thanks for your answers!

Re: Retrieving associations over CMIS

shivam — Wed, 16 Dec 2009 12:38:02 GMT

Hi Guys,
Sorry to pull in a different topic, I just started with CMIS web services call. I am getting security header error when I try to call CMIS web service. It will be great if you can share a code sample where you make a call to web services.

Anything basic like getRepositories OR getRepositoryInfo would be great.

Awaiting response.

Regards,
Shivam

Re: Retrieving associations over CMIS

fupduck — Thu, 21 Apr 2011 10:03:33 GMT

Hey folks,

thanks to jpotts i can see that there are relations. But how can i access them?
calling .getRelationships() on the item just returns an empty list.

Thank you 😃

Edit: Ok, now I saw it. So is there really no possibilty at all to get associations via CMIS?
I would really love to know this.
cheers

Edit2: now I found session.getRelationships(). But I just don't get it. Does anybody have an example to share? I'd apreciate that.

Re: Retrieving associations over CMIS

fmui — Tue, 26 Apr 2011 13:53:30 GMT

Child association are not exposed through CMIS.
You can get all relationships by calling getObject() with the parameter includeRelationships=both.

You should also download the CMIS Workbench [1] and discover what is visible through CMIS.

- Florian

[1] http://chemistry.apache.org/java/developing/tools/dev-tools-workbench.html

Re: Retrieving associations over CMIS

fupduck — Wed, 27 Apr 2011 08:42:37 GMT

Thank you for this information 😃

Finally got it to work.