Support of rdf:langString data types when querying observations

[ortnever]

No value appears in the Filter "Schadstoffe" of the Dataset "MFM-U Luftdaten Jahresmittel NOx"

1. Open test.visualize and navigate in German
2. search MFM-U, include Draft
3. Select the data set "MFM-U Luftdaten Jahresmittel NOx"
4. Create a bar chart visualization
5. Next -> the filter of dimension "Luftschadstoffe" is empty, while in the middle it's written "Messstation: Camignolo, Luftschadstoff: NOx".

Environment (please complete the following information):

Visualize environment : v3.2.7 [https://github.com/visualize-admin/visualization-tool/commit/ce02c26680448b1b7c4f4e8ca1b171484ae9120e]
Browser and version : Edge 97.0.1072.55 (64 bits)

[ptbrowne]

Hi Veronique, I am looking into the issue, the first thing I see is that in the log I have a message "WARNING: Dimension https://environment.ld.admin.ch/foen/UBD010702/station has dataType 'langString'. Filtering won't work.". It is not very clear to me yet, I will continue to look into it, but maybe this has something to do with the cube itself.

[ptbrowne]

I see that we have specific code to log a warning for this specific type of dimension.

619ec5f

@l00mi Do you have more information on why this was added ? What are rdf:langString ? Should the cube be modified to work ?

[ortnever]

I removed the language for the Stations and Parameter dimensions, in the Cube UBD10703 MFM-U Luft Russ. It works in test Visualize (choose Version 2).
I left UBD10702 MFM-U Luft NOx as it was, for bug tracking.

[ptbrowne]

Thanks Veronique from reporting this issue. I have several remarks

• From the point of view of visualize.admin, any dataset that used those rdf:langString could not be used I think since we have never been able (from what I see in the code) to use filtering on this kind of dimension, to fetch the observations
• Considering the display of values in the dropdown, I was able to make it work, but this is not the same story for the observations, that use another query.
• Thus, I would rename this issue now to "Support rdf:lang columns when querying observations", re-label this issue from “bug” to “enhancement” because at the moment even though rdf:langString works in the cube creator, it is not supported in visualize yet for observations and we would need to implement this in a future sprint if we choose that supporting cubes with rdf:langString columns is important

[ptbrowne]

You can see now that the dropdown values are loaded on test.visualize.admin for the "UBD10702 MFM-U Luft NOx" dataset.

[ortnever]

OK. Thanks for the research.
So as long as we enter the String type, without specifying a language in the CC it's ok, right?

[ptbrowne]

Yes :)