On Wednesday 29 May 2002 04:20 pm, Casey Duncan wrote:

try:

ob = r.getObject() ob.function()

ob gets returned as None -- I think this is due to AbstractCatalogBrain::getObject(). I don't believe self.aq_parent is set correctly -- how is it supposed to be set ?

or if that doesn't work:

ob = catalog.getobject(r.data_record_id_)

AttributeError -- getobject doesnt exist?

ob.function()

Bear in mind that getObject traverses to the object which is expensive both in time and memory if the number of results is large.

OK -- is there a better way to do all of this ? What I am trying to do is have ZODB store objects and Catalog maintain indexes on them. Now I can come back and do a 'SELECT' on the objects, say for variable != 1, and somehow get access to the original objects if I wish to. Is there somewhere that documents using Catalog and PluginIndexes without all of the other Zope stuff? Any documents on using it with the Zope stuff ? Nic

hth,

-Casey

On Wednesday 29 May 2002 04:05 pm, Nicholas Henke wrote:

...

Hello~~ I am playing with using the Catalog class in ZCatalog along with

CatalogQuery

...

to create a generic object layer on top of ZODB. I can index and search til

I

...

am blue in the face, and I always get the correct answers. Now for the problems...

Say I have the following obj: class test(Persistent): variable = 1 def function(self): print self.__dict__

now if I do: catalog = Catalog() catalog.addIndex('variable', Fieldindex('variable')) catalog.addColumn('variable') obj = test() catalog.catalogObject(obj, id(obj))

catalog_query = CatalogQuery(catalog, "variable==1") results = catalog_query() for r in results: print r.variable # ok print r.getRID() # ok print r.function # NameError

...so I can get an object (a mybrains instance )back that allows me to print r.variable, but I cannot get r.function(). How does one do this? Is there a mapping between RIDs in the catalog and

real

...

objects somewhere? Do I need to do that mapping in an IOBtree (it would make the most sense since I am using id(obj) as the uid in the catalog)? Is there somewhere in Zope/google/web that does this?

Thanks for any help!! Nic

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