With the graphical modeler in QGIS, how can I update a field called "inters" from layer "a" by setting the values to 'yes' or 'no'. Values are determined on the intersection of another input layer "b". I used a string based on the overlay_intersects function, both as a "value" or "pre-calculated value" but it doesn't work:
I add a screen to clarify my test by using "rename a layer":
The model gives me an error about the expression used. Any suggestions?
When using the Field Calculator Algorithm, use this expression to update the field: overlay_intersects ('b'), where b is the layer name. See screenshot, where the output is labeled with the content of the updated inters field:
In case you want to use an output of a processing algorithm as input, instead of the layer name, use the variable of the algorithm: QGIS automatically adds a varibale with the algorithm's name and the suffix _OUTOUT - here, the variable's name to use is @This_is_my_buffer_algorithm_OUTPUT, based on my name This_is_my_buffer_algorithm I gave to the buffer algorithm and the @ character that indicates a variable.
In the screenshot below, I used a buffer algorithm, based on a point layer, to create a polygon layer and then I test on another layer called a if it intersects with this buffer layer:
