[Qgis-user] model builder - merge several inputs

[Simon Dietmann]

Dear list,
 
I am trying to find a solution for the following problem with the model builder:
 
My model asks for two vector polygon layers that will be combined by `union´. The resulting layer gets a new field (field calculator) and is evaluated by `Statistics by categories´ algorithm. The fields for the categories are selected by the user when calling the model. Since those fields are present in the two separate input layers, I have to use two separate `Vector field´ inputs.
The problem arises when I try to combine those two input variables to use them together for the `Statistics by categories´ algorithm. AFAICS there is no function inside the model builder to achieve this, so I suggest I have to export the model as  a python script. There I found that the call of the Statistics function gives the name of the variable as a parameter and not the variable itself:
alg_params = {
            'CATEGORIES_FIELD_NAME': parameters['fields'], ....
 
How can I combine my two lists (~like "parameters[`fields´+´fields2´], or is there a way to do this inside the model builder that I didn´t find?
Thanks in advance for help, kind regards
 
Simon Dietmann
 
 
 


Mit freundlichen Grüßen
im Auftrag

Simon Dietmann
M.Sc. Physische Geografie
 
Aufgrund der aktuellen Situation bin ich zur Zeit vermehrt im Home Office tätig und dort erreichbar unter +49 69 - 57 80 56 98 oder per Email, ich rufe Sie dann gerne zurück.



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