On Jul 15, 2006, at 3:52 PM, Michael Carter wrote:
> To keep the extension from loading data beyond the id, a hook will
> be placed at the end of Query.compile so the sql query can be
> modified to forget about those extra columns. Quick question, under
> what circumstance, if any, will the next two lines (which come
> after the place where the hook would go) add more columns besides
> the id?
>
> # give all the attached properties a chance to modify the query
> for key, value in self.mapper.props.iteritems():
> value.setup(key, statement, **kwargs)
>
those lines are the lines that put the columns into the query. the
extension would be like:
if extension.compile_columns(....) is EXT_PASS:
for key, value in self.mapper.props.iteritems():
value.setup(key, statement, **kwargs)
> As for caching objects, the Proxy object can get its data from
> wherever it wants when its class changes to the real version.
>
> Now as for caching the results of a select, this is the clearest
> way I can see to do it. Override Query.select via MapperExtension.
> This can check the cache first for results. if it can't find the
> results in the cache, it returns sqlalchemy.orm.EXT_PASS. if it
> does, it creates a list of proxy instances out of the result and
> returns them.
>
oh, you *do* want to cache the queries as well eh ? i would consider
this a separate function from the proxy object thing. I can
definitely see people wanting the proxy object functionality without
using a cache.
i would just do it the way SelectResultsExt does it in
selectresults.py, using select_whereclause to actually query the DB.
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