4

I am trying to use select by expression or extract by expression in QGIS Graphical Modeler. I add a vector layer for input (have also tried vector features) I add the algorithm, select the input layer, then go to build the expression and there are no fields listed under Fields and Values. If I manually input the expression I get an error that the column is not found.

0
1

I have illustrated you an example for your problem.

I identify six steps:

  1. I have a layer called "department" and I want to select the feature which has the value "Ain" in the field "nom_dep"
  2. In the graphical modeler, I add a vector layer and a Select by expression algorithm. We will set up this algorithm.
  3. Firstly, the input layer will be the layer chosen in the model
  4. Then, I enter my expression (they find me no field as well and tell me that my expression is wrong but I know that it's right)
  5. I launch the model
  6. My selection went well

enter image description here

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.