[Neo] Popularity sorting

Craig Taverner craig at amanzi.com
Wed Feb 10 13:27:36 CET 2010

I understand that the problem is not how to store this, and the hash is a
solution to that, but how to measure 'popularity' if you don't get the same
node as many times as it was bought (due to traverser only returning each
node once). I think the solution can be as simple as:

   - have the traverser return the list of nodes for products bought by
   people that bought X (as before)
   - count popularity on each product as the count of incoming 'bought'
   relationships (so don't need to do this as part of the traverser)

Of course, it might also be a nice convenience if the traverser, in it's
duplicate detection code also kept a counter, and this could be requested

On Wed, Feb 10, 2010 at 1:10 PM, <rick.bullotta at burningskysoftware.com>wrote:

>   Hi, Chris.
>   You could implement something as straightforward as a
>   HashMap<String,Integer> that, as you traverse the graph, insert or
>   increment the Product and its "popularity accumulator".  Alternatively,
>   what we've generally done for more complex types of queries (sorted,
>   aggregated, complex filters) is to reduce the list of nodes to a
>   manageable set via smart traversals (e.g. other products purchases by
>   customers who have bought product X), and while traversing, create Java
>   objects that correspond to the values needed for the query (along with
>   a reference to the original node).  We add these Java objects to an
>   ArrayList, then we wrote a library of classes that allow us to do
>   SQL-like functions on the resultant collection.
>   Rick
>   -------- Original Message --------
>   Subject: [Neo] Popularity sorting
>   From: Chris Owen <cowen at thoughtworks.com>
>   Date: Wed, February 10, 2010 3:05 am
>   To: user at lists.neo4j.org
>   Hi,
>   One of the questions that we were asked to try and answer was:
>   *"based on Product X find other Products Customers bought who also
>   bought
>   Product X". *
>   This is quite simple to traverse, but what we were now trying to answer
>   a
>   very similar question of:
>   *"based on Product X find other Products Customers have bought who also
>   bought Product X and order by Popularity". *
>   We have not managed to find a way without altering the internal
>   traverses of
>   Neo4J to be able to see how many times a node is found as by default it
>   ignores duplicates. Any ideas of how we solve this problem?
>   Cheers, Chris.
>   --
>   Chris Owen
>   Developer
>   ThoughtWorks UK
>   cowen at thoughtworks.com
>   Mobile: 07886711645
>   IM: chris.jowen
>   Twitter: chrisjowen
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