Extract change with Python

[AhjungKim4]

I am trying to extract data changes from AGO-hosted feature service.  I am referring to the REST API and using Python API feature layer collection extract_change method.  According to the documentation, required parameters are 2) layers and 2) layerServerGens.  However, when I use the following code, it complains about optional parameters such as geometryType and inSR.   I tried to find a sample code that uses the same method but had no luck.  Help! 

[KarstenRank]

Hi,

is the change tracking  enabled for ArcGIS Online hosted feature services?

[AhjungKim4]

Yes,  this is the feature service https://services.arcgis.com/DN2fPfpggEPlLhP6/arcgis/rest/services/HydrantInspections/FeatureServer/e... 

[JoshuaBixby]

To me, it looks like a defect in the ArcGIS API for Python‌.  I tested a code snippet using your service, and the ArcGIS API for Python appears to be building a bogus/invalid URL request.  For the optional parameters in the REST API Extract Changes call, the ArcGIS API for Python is passing "None" and the REST API considers those invalid.

[AhjungKim4 · Accepted solution]

That makes sense.  I ended up passing the optional parameters it complained about and it worked.