Problem using SPARQLGraph's "subjects" method

[Tatiana Al-Chueyr]

Hello guys!

First of all, well done for implementing RDFAlchemy! It is awesome to be able to use ORM to access RDF triplestores.

I'm using RDFAlchemy to access a SPARQL endpoint (DBPedia), and the "query" method worked fine. However, I didn't succeed using SPARQLGraph's "subjects" method. It is returning an empty list while it was supposed to find 43 instances - just as the query.

I've pasted the code here (both the working version with query, and the unsuccessful version using subjects):
https://gist.github.com/2967837

Am I doing something wrong?

These are the versions I'm using:
- Python 2.7.3
- RDFAlchemy==0.3
- rdflib==3.2.1

I had problems installing RDFAlchemy via pip, so I downloaded from GitHub [1] and installed (master) via setup.py.

I'd really appreciate your feedback.

Regards,

Tatiana

[1] https://github.com/gjhiggins/RDFAlchemy

[Tatiana Al-Chueyr Martins]

Just found out, the problem was using the namespaces! My mistake ;)

Line 28:
metal_guys2 = list(graph.subjects(predicate=DB.genre, object=DBONTO.Metal))

Should be:
metal_guys2 = list(graph.subjects(predicate=DBONTO.genre, object=DB.Metal))

Thanks!

Tatiana

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Tatiana Al-Chueyr

[Philip Cooper]

On 6/21/12 2:40 PM, Tatiana Al-Chueyr Martins wrote:

Just found out, the problem was using the namespaces! My mistake ;)

Line 28:
metal_guys2 = list(graph.subjects(predicate=DB.genre, object=DBONTO.Metal))

Should be:
metal_guys2 = list(graph.subjects(predicate=DBONTO.genre, object=DB.Metal))

Great

On 21 June 2012 16:29, Tatiana Al-Chueyr <tatiana....@gmail.com> wrote:

These are the versions I'm using:
- Python 2.7.3
- RDFAlchemy==0.3
- rdflib==3.2.1

I had problems installing RDFAlchemy via pip, so I downloaded from GitHub [1] and installed (master) via setup.py.

current Pypi version is 0.2.9 which works with pip. 
The 0.3 is a fork where Graham Higgins has helped push the ball forward, especially for py3k.  I'll try to merge those branches and post an update.

--
Phil

[Tatiana Al-Chueyr]

On Thursday, June 21, 2012 5:45:09 PM UTC-3, Philip Cooper wrote:

[CUT] 

current Pypi version is 0.2.9 which works with pip. 
The 0.3 is a fork where Graham Higgins has helped push the ball forward, especially for py3k.  I'll try to merge those branches and post an update.

Perfect, Phil, thanks!