[OSM-dev] Minute Diffs Broken
frederik at remote.org
Tue May 5 22:53:25 BST 2009
Tom Hughes wrote:
>> Perhaps this could be done internally: User uploads new relation;
>> Rails goes through the elements of that new upload, and checks whether
>> these elements were already in the previous version. If yes, no
>> further check is required (because the previous relation is assumed to
>> have only valid members), so we only need to check those members that
>> are new.
> Except the whole point is to avoid looking up all the members... Once
> we've looked them up checking if they're still visible is cheap.
I was trying to say that you don't have to look them up. You get the
member ids/types of the new relation, remove from that list the member
ids/types of the old relation, and then look up only the remaining
members, if any.
Or did you mean that it takes tens of seconds to execute the Rails
equivalent of "select * from relation_members where id=1234"?
Frederik Ramm ## eMail frederik at remote.org ## N49°00'09" E008°23'33"
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