I am new to GIS models. I was preparing a very basic model which does the following task:
1.) Inputs 2 shapefiles
2.) Projects their co-ordinate system
3.) Repair Geometry
4.) Add Field(ID_no)
5.) Field Calculate for the field "ID_no."
Actually i want to apply if condition that if there is already a field named "ID_no" in the shapefile, don't add field else if there is not a field named "ID_no" in the shapefile then add the field.
Please help me out regarding how should I do this in GIS modelling as I am unaware of python.