Hi,
I've a question: why declare the specific attributes for
indexing/metadata at all? I couldn't see what binds the cmf:indexable
declaration to a particular adapter in the example, so I was wondering
if we could do without. Suppose we had an adapter like:
<adapter
name="NavigationProperties"
for="IContent"
provides="ICatalogVariables"
factory="addNavigationProperties"
/>
where ICatalogVariables defines a single method that returns a dict of
properties and values to index. (FWIW I put an implementation of this
interface in the tracker a while ago (#378) plus some code to expose
plone's indexing registry as this interface.) It could even define a
second method that indicated the available properties.
The catalog could work out everything that provides the
ICatalogVariables interface, and calculate the properties to index. It
will already index/record them as metadata if they have been added as
metadata/indexes in the catalog, so not sure what all this declaration
really buys us.
It does get us some cool stuff if we want to automatically set up
indexes using the configuration or check that indexes/metadata exist in
the catalog. But wouldn't the index configuration be part of a CMFSetup
profile? In which case it would start living in two places, which could
get confusing. Also, wouldn't having something that sets indexes up
automatically cause a conflict when you need to add a new type of index
to optimise out a hotspot?
Having seen data go into the catalog, out the other side and into the
bin when I've forgotten the index, some way of checking thar
indexes/metadata exist would be useful. But perhaps it's preferable to
log this to the event log or something, rather than add new directives?
I'm not clear about what the pros and cons are of new directives vs.
using code, perhaps someone with more experience has some ideas?
Anyway, just some thoughts. It would be good to really get the catalog
to be a 'service' with hooks that things can register with in a simple
way, rather than having to do quite so much to wire them in.
Cheers,
pete
whit wrote:
here is a sketch of how a working "indexable" configuration would look.
Names subject to improvement.
------------
<configure xmlns="http://namespaces.zope.org/cmf";
xmlns="http://namespaces.zope.org/zope";>
<adapter
name="SearchableText"
for="IContent"
provides="IIndexable"
factory="SearchableTextExtractor"
/>
<adapter
name="folder_order"
for="IContent"
provides="ICatalogMetadata"
factory="folderOrderCalculator"
/>
<cmf:indexable
for="IContent"
attributes='SearchableText
path
folder_order'
metadata='folder_order' />
<!-- or this for interface lovers --/>
<cmf:indexable
for="IContent"
attributes='IContentIndexableAttrs'
metadata='IContentMetadataAttrs' />
</configure>
-------------
Our primary goal was is to be able to catalog non-direct
attributes as both indexes and metadata. This straight forward to
accomplish.
Eventually, I think it makes sense, as content gets happily dumber, that
all indexing should work this way.
For backward compatibility, a default adapter could return direct attrs
from an object for indexing.
<adapter
provides="IDefaultIndexable, IDefaultMetadata"
for="*"
factory="directAttrAccess"
/>
<cmf:indexable
for="*"
attributes='*'
metadata='*' />
Ultimately, if you didn't need back compatibility, you could override
like this:
<cmf:indexable
for="*"
attributes='None'
metadata='None' />
then developers could determine class by class and interface by
interface (and perhaps even by event) what was called when an object is
indexed, thus lowering the overhead of cataloging.
Some other niceties come to mind when thinking about this that may not
be inially easily attainable; the main two are installation of indexes
via configuration and the validation of index existence by the
cmf:indexable handler.
I look forward to y'alls comments.
-w
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