[Qgis-user] Themes, visibility, layout, report, atlas and Layer ID vs Layer name

[Jésahel Benoist]

Hi Alexandre,

Le jeu. 19 août 2021 à 23:51, Alexandre Neto <senhor.neto at gmail.com> a
écrit :

> Hi,
>
> Actually, in the past, most things depended solely on layer names. As
> Charles mentioned this posed lots of problems when there were layers with
> the same name.
>

Yes, it can't be solely on layer names. An id is necessary. But I think a
random and changing id is a problem too, especially if the user can't
define it.


> Maybe I did not understood the difficulty that you are facing, but if you
> need to swap layers, instead of loading a new layer and remove the old one,
> you can simply use the change data source functionality to change the
> source of UL our data, this will keep your layer id intact. Besides, even
> if the layer attributes are different, as long as the ones used by atlas,
> styles, etc are kept, every should keep working fine.
>

It is fine especially for users using files like shapefiles. But the point
is not about data sources, it is more about updating layers when needed in
well defined projects and having their id reinitialised. The source is the
same.

For example when I'm updating a group of layers about a specific topic,
users can only update this specific group in their projects. But if they
do, they'll have to change their templates too. A group may contain
modified and new layers, what would need a lot of work to simply update.


> Besides the change data source option on each layer context menu, you can
> also use the change data source plugin for when you want to change too many
> layers.
>

Yes, I'm using these a lot. It's great, especially when I'm doing portable
versions of my projects.


> Best regards,
>

Best regards too

Jésahel



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