Automatically generating output paths in QGIS Model Designer

Question

I am building a model to produce 62 separate output files. I need an easy way to change output paths on all these outputs as the input data changes. I need them to keep their naming, just change a subfolder.

I tried creating a model variable and using the "@" notation, but apparently, that does not work in paths. Also, I am having some difficulty finding any useful data on this particular part of the Model Designer.

I marked the part that needs changing between runs in the image below.

enter image description here

The solution in this answer is either too complex for my needs or I just don't understand it.

• Bera: Are you executing the model in batch mode? Based on what should the output folder change? You want the path to be D:/Datai/Municip1/... then D:/Datai/Municip2/ ...
• peroman200: No. I have 2 inputs that produce 62 outputs in one run. I am looking for a way to change the output folder without changing the names of output files.
• peroman200: To directly answer your question, output should change based on an input of one folder in the path.

Answer 1

As long as your outputs are shapefiles this works:

Set the outputs to pre-calculated values like:

array_to_string( array:=
string_to_array( string:=@folder_param, delimiter:='\\'),
delimiter:='/') || '/' || 'Buffer.shp'

I believe the problem when using just the @folder_param is that the paths have backslashes in them, like C:\folder\buffer.shp when it needs to be forward slashes: C:/folder/buffer.shp.

The expression splits the folder path into an array ['C:', 'folder'] and joins it back to a string using / as delimiters.

(I select the folder C:\Users\bera\Desktop\gistest111円 when executing the model.)

enter image description here