Can we use "IF ELSE" condition in Arcmap without using python script

Question

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.

MarcoBoeringa · Answer

Akhil,

For the specific case of the "Add Field" tool, you don't need an If..Else construct. The tool has been written to automatically skip adding a new field, and allow the model to continue, when there is an existing field with the same name as needs to be added, it will just emit a warning in the geoprocessing log, but continue.

curtvprice · Answer

This should work if the field exists or not if you connect the output of Add Field to Calculate Field.

AkhilChhibber1 · Answer

Actually what exactly I wanted as a result of my model is that:

After the Add field, the next step is "Calculate Field" in which I copy the numbers same as FID.

This step i.e. "Calculate Field" is not working in case the field "ID_no" already exist.

What should I do in this scenario???????