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In ArcGIS ModelBuilder, is it possible to create a variable (that can be used as a precondition for following tools) that tells if an iteration has been finished?
Example: An iterator buffers all feature-classes in a file-geodatabase and creates an output for each of that feature-classes. After all feature-classes have been buffered, I want to run a new tool.
How do I set the completed iteration as a precondition for that tool?
I'm not fluent in python.
My answer/comment in your original question (Action after iteration in ArcGIS ModelBuilder?) still stands, a fairly simple piece of python code will resolve this which returns a True or False value that you could use as a precondition.
An example would be:
The Calculate Value tool would be set up as:
It is simply checking that the number of feature classes in the output workspace matches the number in the input workspace.
The full python code block is this:
import arcpy
def test(inws,outws):
# Count input featureclasses
arcpy.env.workspace = inws
infcl = arcpy.ListFeatureClasses()
# Count output featureclasses
arcpy.env.workspace = outws
outfcl = arcpy.ListFeatureClasses()
if len(outfcl) == len(infcl):
return True
else:
return False
In my example I am sending the buffers to the IN_MEMORY workspace, you would need to change that to where your output is going. Do that by changing the text in the expression box.
It can be achieved by integrating a model within a model. https://desktop.arcgis.com/en/arcmap/latest/analyze/modelbuilder/integrating-model-within-a-model.htm
it is not really a precondition you are diagramming but a nested model within another model. It is often referred to as a sub-model. I this case the red box (inside) is a sub-model. Your diagram is a little difficult to see the interaction between the models but appear to need to collect the values from the top area outside the red box.
This is a good pointer Problems Integrating Sub-Model into Master Model
