topic Re: Where to look for categories? in Alfresco Archive

Where to look for categories?

alina — Fri, 10 Aug 2012 21:06:49 GMT

Hello everybody, I'm a total newbie to Alfresco scripting, but I have an urgent task, that has to be completed 'yesterday'. I'm a PHP& JavaScript programmer, but I do not yet understand the object model and the framework in Alfresco.My task is to create category tree according to a structure sto

Re: Where to look for categories?

afaust — Sat, 11 Aug 2012 09:34:06 GMT

Hello,

categories can be found via the classification root object.

Regards
Axel

Re: Where to look for categories?

alina — Mon, 13 Aug 2012 08:38:50 GMT

Axel, thanks a lot for your help.

Another question on classification. I have two properties there: a name (in Cyrillic) and a description. node.name returns me its ID (hex) and I cannot find descriptions at all.

And the final point is to create categories with descritions. I can see createSubCategory function, but it accepts only 'name' as an argument. How can I add a description?

Re: Where to look for categories?

afaust — Mon, 13 Aug 2012 08:54:46 GMT

Hello,

hmm, node.name (or alternatively node.properties.name) should yield your cyrillic name, not the ID. The description is a regular property and should be obtainable by node.properties.description.

You're right that the createSubCategory function only accepts a "name" argument. All classification services in Alfresco work on the assumption, that a classification node at their core only require a name for the classification tree. In order to add and access metadata to categories, you need to use the standard NodeService or ScriptNode operations, since categories are essentially just plain old nodes. So 1) create category via createSubCategory and then 2) modify the properties of the returned category node.

Regards
Axel

Re: Where to look for categories?

alina — Mon, 13 Aug 2012 15:26:25 GMT

Thank you very much for your answer.

Yet I don't understand. Maybe on my installation there is smth. wrong with the classification object?

I've written a primitive script - a line, actually:

var nodes_prop = classification.getAllCategoryNodes().length;‍

And only this var output in the template.

This is what I get from the server:

Message:   07130152 Wrapped Exception (with status template): 07136864 Failed to execute script '/test/folder1.get.js (in repository store workspace://SpacesStore/Company Home/Data Dictionary/Web Scripts Extensions)': 07136863 Can't find method org.alfresco.repo.jscript.Classification.getAllCategoryNodes(). (workspace://SpacesStore/Company Home/Data Dictionary/Web Scripts Extensions/test/folder1.get.js#3)
    
Exception:   org.mozilla.javascript.EvaluatorException - Can't find method org.alfresco.repo.jscript.Classification.getAllCategoryNodes(). (workspace://SpacesStore/Company Home/Data Dictionary/Web Scripts Extensions/test/folder1.get.js#3)
    
   org.mozilla.javascript.DefaultErrorReporter.runtimeError(DefaultErrorReporter.java:109)
   org.mozilla.javascript.Context.reportRuntimeError(Context.java:1030)
   org.mozilla.javascript.Context.reportRuntimeError(Context.java:1086)

etc…
‍‍‍‍‍‍‍‍‍‍

What is the reason?

Re: Where to look for categories?

afaust — Mon, 13 Aug 2012 16:12:16 GMT

Hello,

you're missing a parameter in your call to getAllCategoryNodes. This method requires you to specify the QName-String of the classification of which you want to retrieve all category nodes, so e.g.

var size = classification.getAllCategoryNodes("cm:generalClassifiable").length;‍

Regards
Axel

Re: Where to look for categories?

alina — Mon, 13 Aug 2012 18:52:12 GMT

Yes, thanks, indeed, my fault. Though I've tried this way too. Now it gives 0 as a result. Is that OK? I guess, no.

Re: Where to look for categories?

afaust — Mon, 13 Aug 2012 20:53:21 GMT

For cm:generalClassifiable this is not ok (except if you have deleted all the out-of-the-box categories). It may be that your Lucene / SOLR service is not working correctly, since all category handling is done via searches. Check the categoryRoot and classification via the node browser to make sure the categories are actually there.

Regards
Axel

Re: Where to look for categories?

alina — Mon, 13 Aug 2012 21:25:57 GMT

The categories are there. And if I use luceneSearch, I find many of them (but without proper names, as I've told above). What can I do in such situation? Is it possible to fix the search services?

Re: Where to look for categories?

alina — Tue, 14 Aug 2012 15:07:08 GMT

Our admin told me that there are indexes broken on the site. Could that be the reason?

Re: Where to look for categories?

afaust — Tue, 14 Aug 2012 15:12:11 GMT

Yes - category search / navigation in admin view uses index and if there is some corruption, this may explain your issues.

Re: Where to look for categories?

alina — Tue, 14 Aug 2012 20:07:20 GMT

ОК, Аxel, thanks A LOT for your help. Your advice was very useful.

Re: Where to look for categories?

alina — Mon, 20 Aug 2012 07:24:35 GMT

I'm stuck again.

This weekend the indexes were rebuilt, so the code

var size = classification.getAllCategoryNodes("cm:generalClassifiable").length;‍

works ok.

Now I can get the full list of the categories, but I cannot find categories by name.

var nodes = classification.childByNamePath("Test");‍

gives me

Message:   07200006 Wrapped Exception (with status template): 07200446 Failed to execute script '/test/folder1.get.js (in repository store workspace://SpacesStore/Company Home/Data Dictionary/Web Scripts Extensions)': 07200445 TypeError: Cannot find function childByNamePath. (workspace://SpacesStore/Company Home/Data Dictionary/Web Scripts Extensions/test/folder1.get.js#1)
    
Exception:   org.mozilla.javascript.EcmaError - TypeError: Cannot find function childByNamePath. (workspace://SpacesStore/Company Home/Data Dictionary/Web Scripts Extensions/test/folder1.get.js#1)‍‍‍

What's wrong? How can I find a category by its name?

Re: Where to look for categories?

afaust — Mon, 20 Aug 2012 09:47:03 GMT

Hello,

you can't use childByNamePath on classification as this is not a propert ScriptNode. You need to obtain the root node to search from first. Unfortunately, you can only obtain root categories via classification, not the absolute root node for the entire category tree. This means you have to look up a root category via JavaScript loop and name checks, while any category below a root category may be found via childByNamePath relative to that root category node.

Please be aware that if you use childByNamePath you will NOT end up with a CategoryNode - all elements returned are simple ScriptNode, which lack some category related functionality. The only alternative to this is implementing your own JavaScript based lookup which uses the getRootCategories (classification) and getSubCategories (CategoryNode) functions and finds your target category via loop and compare operations.

Regards
Axel

Re: Where to look for categories?

alina — Mon, 20 Aug 2012 11:10:28 GMT

It's sad. Thanks, Axel.
Unfortunately, in Alfresco 3.4. there is even no method called getSubCategories. So my task is simple - to loop through all the categories.

Alina