topic Re: Extract change with Python in ArcGIS API for Python Questions

Extract change with Python

AhjungKim4 — Wed, 25 Mar 2020 20:50:45 GMT

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!

Re: Extract change with Python

KarstenRank — Wed, 25 Mar 2020 21:21:10 GMT

Hi,

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

Re: Extract change with Python

AhjungKim4 — Thu, 26 Mar 2020 14:41:10 GMT

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

Re: Extract change with Python

JoshuaBixby — Thu, 26 Mar 2020 17:13:07 GMT

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.

Re: Extract change with Python

AhjungKim4 — Thu, 26 Mar 2020 17:31:46 GMT

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