[QGIS-Developer] QGIS expressions: map vs dict
a.neumann at carto.net
Fri Aug 4 11:01:07 PDT 2017
Hi devs, Hi Patrick,
I noticed that in QGIS master there is a new group of expressions called
"Maps". I think they have been developed by pvalsecc (Camptocamp).
First, thanks for adding them!
I know that is has been added a while ago, but I would like to discuss,
if this group of functions could be renamed to "Dicts", with a prefix of
"dict_xx" instead of "map_xx". Alternatively, it could be named "kvp_"
The reasoning is that in the future we may want to have multiple maps
per project and we may want to reserve "Maps" for actual maps
(identified by name or id).
Besides, users that do not know programming, might not understand that
this is not about maps, but actually about a dictionary data structure
or key/value pairs.
Another thing: the declaration of a "map" or "dict" could be improved:
The current notation is:
Wouldn't it be nicer to have something like:
map('1':'one', '2':'two') or map('1':='one', '2':='two')
It would be easier to read than just a lot of commas, where every second
one is a key, resp. the value.
Any thoughts on these two issues about "map" expressions?
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