Hi all
Say that I have a solr index with 5000 documents, each representing a
campaign that users of my site can join. The user can search and find
these campaigns in various ways, which is not a problem, but once a
user has found a campaign and joined it, I don't want that campaign to
ever show up again for that particular user.
After a while, a user can have built up a list of say 200 campaigns
that he has joined, and hence should never see in any search results
again.
I know this functionality could be achieved by simply building a
longer and longer negation query negating all the campaigns that a
user already has joined. I would assume that this would become slow
and ineffective eventually.
My question is: is there a better way to do this?
Thanks
Alec
