Hi
There is also another alternative available in Neo4j.rb (the JRuby
Neo4j wrapper) by using lucene.
In Neo4j.rb you have access to the full lucene query language.
Examples:
Person.find(:name => 'kalle').sort_by(:salary)
Person.find("name:kalle AND salary:[10000 TO
30000]").sort_by(Desc[:salary, :country])
Cheers
/Andreas
On Wed, Nov 18, 2009 at 1:07 AM, Anders Nawroth
<and...@neotechnology.com> wrote:
> Hi!
>
>> I want to use neo4j to build a prototype of a social network
>> application because of his graph structure and I have a problem when I
>> try to filter and sort the nodes resulted from traversal.
>> For example - I want to show a list with members of a group filtered
>> by some property and ordered by another; I don't find any optimization
>> for filter/sort operations in neo.
>>
>
> Regarding filtering, my first thought goes to using ReturnableEvaluator
> when using a Traverser to find nodes. The ReturnableEvaluator decides
> which nodes should go into the result. If you need to block traversal
> beyond specific nodes or at a specific depth, have a look at the
> StopEvalutor as well. You'll find some hints on searching in Neo4j here:
> http://wiki.neo4j.org/content/Design_Guide#Search
> The evaluators are described in the core APIdocs:
> http://api.neo4j.org/current/
>
> The structure of the node space can also be used to implement your very
> own indexing/search stuff. You can find a practical example of that here:
> http://wiki.neo4j.org/content/IMDB_Search_Engine
>
> For sorting, the simplest option is to do it in your own code.
>
> HTH!
>
>
> /anders
>> Do you have some implementation suggestions? Do you think that neo4j
>> can be used for this kind of job?
>>
>> Thank you.
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