2010/7/5, Jörg Richter <j...@deepamehta.de>:
>
> How can a MetaModelClass be renamed?
> There seems to be no obvious way.
>
> I tried to change the "meta_model_name" property of the wrapped node and
> re-index the node. This basically works, but namespace.getMetaClass() still
> returns a MetaModelClass object when called with the old name. IMO it would
> be correct if null is returned in this case, like for any unknown class.
> Otherwise the application could get confused.
>
> Example code:
>
> // creating a class and getting the wrapped node
> MetaModelClass class1 = namespace.getMetaClass("My Class", true);
> Node classNode1 = class1.node();
>
> // change the node's name property and re-index
> classNode1.setProperty(MetaModelProperty.KEY_NAME, "New Class Name");
> index.removeIndex(classNode1, MetaModelProperty.KEY_NAME);
> index.index(classNode1, MetaModelProperty.KEY_NAME, "New Class Name");
>
Maybe there's some bug in the removeIndex(Node,String) method. Instead
try to do a:
index.removeIndex(classNode1,MetaModelProperty.KEY_NAME,classNode1.getName());
before you set the new name
> // both calls return a class, the second one shouldn't
> namespace.getMetaClass("New Class Name", false);
> namespace.getMetaClass("My Class", false);
>
> Tested with latest snapshots of neo4j kernel, index, and meta-model
> components and Lucene 2.9.2
>
>
> API proposal:
>
> Class MetaModelObject should have a setName(String) method for easy and
> consistent renaming of classes and properties.
> Furthermore, namespace.getMetaClass() should return null when called with a
> stale name.
>
What is your use case for renaming a meta model class? Is that really
functionality that should be used at runtime? My gut feeling says that
this is a develpment time thing and once a class is created with a
name it sticks with that name. Or are you doing some kind of migration
of your data?
> BTW: one big up to the great Neo4j team and community!
Cheers!
> Cheers,
> Jörg
>
>
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--
Mattias Persson, [matt...@neotechnology.com]
Hacker, Neo Technology
www.neotechnology.com
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