[QGIS-Developer] QGIS Server 2.x and caching question

[Régis Haubourg]

Hi Andreas,
Wow good catch finding the causes of such an issue!
I can't answer myself on the technical part.

> The "human readable" nature of qgs/qml files naturally seduce people to
> copy / paste and mix project stuff together in text editors ...
>
Well, I don't quite agree here. Doing copy paste with our wml structure is
not human, it's a proof that human can be very ingenious :) !  I wouldn't
ever recommend that. I have just tried to play with git and diff for a long
time with QGS project files, and I wouldn't ever recommand to do that.
Replacing datasources is probably the only safe thing to do in this XML
file.
I would just wait to see if we see that ever again before tackling this.
Best regards
Régis

Le mar. 11 juin 2019 à 18:28, Andreas Neumann <a.neumann at carto.net> a
écrit :

> Hi all,
>
> At my new work place we are running a 2.x QGIS server  which in two
> projects behaves very strange: sometimes colors display in the color we
> expected, sometimes really light. Then my colleagues discovered that more
> than rules share the same UUID identifier, because the QGS files have been
> copy pasted into a anew project and then aggregated again into the same
> single project.
>
> Not knowing about the internals of QGIS server 2x (and 3x) I wonder if
> this something we need to avoid? Are the UUID identifiers of a symbology
> rule relevant and absolutely need to be unique? Do we have to avoid such id
> clashes?
>
> The "human readable" nature of qgs/qml files naturally seduce people to
> copy / paste and mix project stuff together in text editors ...
>
> Thank you for your feedback on this topic.
>
> Andreas
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