[QGIS-Developer] Update an intermediate table with selected features (many-to-many relationship)

[Matthias Kuhn]

Hi Alice

Many-to-many functionality is available in QGIS, see here:

https://gis.stackexchange.com/a/233944/9839

usability-wise it's sometimes still a bit tricky though.

Regards
Matthias

On 09/11/2018 03:21 PM, Alice MARTIN wrote:
> Hello,
> 
> I'm a QGIS user and I need information about a QGIS functionnality which
> doesn't exist yet to my knowledge. Here's my problem :
> 
> I have a PostgreSQL database with two tables :
> 
> - The first one contains geometry data defining hiking sections
> - The second one contains a list of trails
> One section can be linked to several trails, and a trail can be linked
> to several sections : it's a many-to-many relationship.
> 
> I then create an intermediate table to link trails with sections and use
> a QGIS project I've created to update it. I've set appropriate
> relationships in project's features. From there, when I click on a
> section with the "Identify Features" tool or in the attribute table's
> section, I can easily indicate which trail(s) is(are) linked.
> 
> However, I need to do this section by section : I can't select several
> sections at once and indicate in a few clicks which trail(s) are linked
> to the sections I've selected. Is it possible to do that with QGIS ? I
> couldn't find anything about it.
> 
> If such a feature isn't available, do you know if its under development
> or if there's a way to help to create this tool? Please let me know.
> 
> Thank you in advance for your help.
> 
> Best regards,
> 
> Alice Martin
>