I've searched, I've tried, I've tested, and I just can't get it. I need help setting up the following in ModelBuilder:
Once I've performed a Search By Attribute task, I need to test if any rows were selected. If so, I need to go to task B. If not, I need to go to task C. In my model I have a Calculate Value task (from ModelBuilder > Insert > Model Only Tools) and in the code I have this code, which I found on the ArcGIS - Desktop forum:
desc = arcpy.Describe(layer)
fidset = desc.FIDSet
if fidset =="":
# A seelction exists so OK to execute
And in the Expression, I have hasSelection("%New Valves Selected%"). In my model, I made task B dependent on the result of the Calculate Value task, which I believe means it must return True. But how do I make Task C dependent on the Calculate Value task being False? This is what I don't get.
In the end, what I'm trying to avoid is doing a field calculate over the entire table if there are no records selected.