Adding children to store root

[hsjawanda]

Hi,

I have been trying a few things, have been getting unexpected results, and now I am confused.  So here are my questions:

Is there anything special about adding a node (say, a folder) directly as a child of a store root? I have a store with protocol "workspace" – will the following code work for adding a folder directly under the store root:

// this.storeRef points to the store I am interested in.
NodeRef rootNode = nodeService.getRootNode(this.storeRef);

// Creating a folder as a direct child of storeRef
ChildAssociationRef childAssocRef = nodeService.createNode(rootNode,
        ContentModel.PROP_CONTAINS, QName.createQName(
                NamespaceService.CONTENT_MODEL_1_0_URI, folderName),
        ContentModel.TYPE_FOLDER);
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Does it matter whether I use ContentModel.PROP_CONTAINS or some other QName as the assocTypeQName when adding a child to a store's root?

What are the differences between creating child associations and creating plain-jane associations (NodeService#createAssociation())? I think one of the differences is that (recursive) searching under a parent node will search those nodes related through child associations, but not those related through plain associations – is this correct?

If I don't put any "PATH:" term in my Lucene search, does the whole store get searched? For example, if I construct a query like this:

String query = "+TYPE:\"" + ContentModel.TYPE_FOLDER.toString() + "\"";
‍‍‍

will I get back a list of all the folders in the store being searched?  Will the assocTypeQName I use while adding children make a difference to the results of the above query?

I apologize for asking so many questions in a single post, but I am getting confused by some of the results I am seeing :-).

Thanks.

[rwetherall]

Hi,

No there is nothing special about the the root node other than its association to its children is called 'children' rather than a folder which is called 'contains'.

I've updated the code below to reflect this:

// this.storeRef points to the store I am interested in.
NodeRef rootNode = nodeService.getRootNode(this.storeRef);

// Creating a folder as a direct child of storeRef
ChildAssociationRef childAssocRef = nodeService.createNode(rootNode,
        ContentModel.PROP_CHILDREN, QName.createQName(
                NamespaceService.CONTENT_MODEL_1_0_URI, folderName),
        ContentModel.TYPE_FOLDER);
‍‍‍‍‍‍‍‍‍‍

What are the differences between creating child associations and creating plain-jane associations (NodeService#createAssociation())?

* A child association implies a hierarchy between nodes.
* An association is a relationship between two nodes (with no hierarchy).

Cheers,
Roy

[hsjawanda]

Hi Roy,

No there is nothing special about the the root node other than its association to its children is called 'children' rather than a folder which is called 'contains'.

This is only a naming convention, right?  Will any constraints be violated if the wrong child-association name gets used?

Deleting a container node deletes its children too, right?

Thanks for your reply to my first posting.

[rwetherall]

Hi,

Yes, the name of the association can be anything you want, it is the type of the association (eg: 'children') that must follow the model defintion.

Yes, when a node is deleted its children are deleted too.

Cheers,
Roy

[soeursourire]

I was thinking I understood how to add a new node in MySQL and I wanted to add a node function in this database under the node People at the same level than Person but not in the node Person. (Person and function are brothers). So I was doing as follow:

- a new class FunctionService that is almost exactly the same than PersonServiceImpl

- in MyNewUserWizard in init() I initialize my function service :
this.functionService = new FunctionService();
this.functionService.setNodeService(this.nodeService);
this.functionService.setSearchService(this.searchService);
//this.functionService.setStoreRef(Repository.getStoreRef());

-in MyNewUserWizard in startWizardForEdit() I added this:
Node nodeFN = new Node(ref);  setFunction(nodeFN);
I have a node Node function;

-in MyNewUserWizard in populate() I added this: 
Map<String, Object> propsFN = getFunction().getProperties();

-And in finish(), I added :
Map<QName, Serializable> propsFN = new HashMap<QName, Serializable>(5);
propsFN.put(MyContentModel.PROP_FN_ID, this.functionId);
String assocNameFN = QName.createValidLocalName(String.valueOf(this.functionId));
NodeRef newFunction = this.functionService.createFunction(propsFN);

However, while doing that when I call the function finish() I have errors such as  Java.lang.NullPointerException. I have apparently a problem in getPeopleContainer (called by createFunction) while doing this:
NodeRef rootNodeRef = this.nodeService.getRootNode(storeRef);
List<NodeRef> results = searchService.selectNodes(rootNodeRef, PEOPLE_FOLDER, null, namespacePrefixResolver, false);

What do I do wrong here?
Thanks for help.

[soeursourire]

I found the problem… my NameSpacePrefixResolver was null. So now I can add a node function in the node People at the same level than the node person however while browsing the NodeBrowser if I first check a node person then the node function has the same properties than person and respectively. And then when I want to check again the node function I have this error:

cannot add component with id 'aspects' and path : {Component-Path : [Class: javax.faces.component.html.HtmlDataTable,Id: aspects]} to its parent component. This might be a problem due to duplicate ids.

I hope somebody will agree for helping me.. thanks

[gavinc]

This is more than likely a bug with the node browser. This error happens in JSF sometimes when a component is not given an explicit id.

Try closing the node browser and returing to it as a workaround.

An issue in JIRA has been raised for this: http://www.alfresco.org/jira/browse/AWC-563

[soeursourire]

Thanks a lot for the answer. So does that mean as well that when I go in my node function and I see the properties of my node person instead it is a bug of nodebrowser? How and where can I check in the database if my nodes are correctly filled?

I also noticed than when I delete some users that I created, they are removed from node browser but all usernames are kept in the database, is it normal?
Thus I wanted to delete some of these usernames from MySQL by command line but now I cannot log in to Alfresco as admin…

Thanks again

[soeursourire]

My god!! Help please!
Since I modified something in the database I cannot log in as admin and have this error page:

javax.portlet.PortletException: Error calling action method of component with id loginForm:submit

caused by:
javax.faces.FacesException: Error calling action method of component with id loginForm:submit

caused by:
javax.faces.el.EvaluationException: Exception while invoking expression #{LoginBean.login}

caused by:
org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [org.alfresco.repo.security.permissions.impl.hibernate.RecipientImpl#org.alfresco.repo.security.permissions.impl.hibernate.RecipientImpl@35f5b8]


What can I do now? I reinstalled MySQL and installed the last version of Alfresco and have this error!!

[kevinr]

Your issue may be related to this problem?
http://www.alfresco.org/forums/viewtopic.php?t=1125&highlight=

It looks like a similar error (it may not be) - keep an eye on the post and we should resolve it soon.

Kevin