Morten W. Petersen wrote:
> I've managed using the ZCatalog now. However, I have a small problem:
>
> When I instansiate a ZCatalog at the root of a tree, and search
> for all objects matching a given meta-type, all the objects in
> the entire tree are returned.
>
> Is there a way to instruct the ZCatalog instance that it should only
> return objects from within a certin part of the tree, without instansiating
> a new ZCatalog instance in the given subtree?
Yes.
Create a keyword index in your catalog called "path_kw_for_catalog".
Create an external method called "path_kw_for_catalog" that, for an
object, returns a list of strings that uniquely represent the physical
path to that object, and to each of its parents by containment.
Create an external method "path_kw" that, for an object, returns a
string that uniquely represents the physical path to that object.
Then, query your catalog using that keyword index, and the results
path_kw for the path you want results from under.
As an example, path_kw_for_catalog might return
['foo_bar_baz', 'foo_bar', 'foo']
for an object at http://your.server.net/foo/bar/baz
In the same example, path_kw would return 'foo_bar' for the object at
http://your.server.net/foo/bar
I don't know whether you can use the results of
string.join(getPhysicalPath(), '/') as a keyword in a KeywordIndex in a
ZCatalog. In the following methods, I'm assuming that you can't. They
can be simplified if it turns out you can.
I'm also assuming that space characters are bad in keyword indexes.
Again, I might be completely wrong. I guess I should check.
Anyhow, these methods should give you the general idea:
from string import join, replace
def kw_path_for_catalog(self):
keywords=[]
pp=self.getPhysicalPath()
for p in range(2, len(pp)+1):
keywords=keywords+[join(map(fix_bad_chars, pp[1:p]), '_')]
return keywords
def kw_path(self):
return join(map(fix_bad_chars, self.getPhysicalPath()[1:]), '_')
def fix_bad_chars(s):
return replace(s, ' ', 'x')
--
Steve Alexander
Software Engineer
Cat-Box limited
http://www.cat-box.net
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