topic Re: Create a Layer object for hosted feature layer in Python Questions

Create a Layer object for hosted feature layer

MichaelWen_Timmons — Thu, 10 Mar 2022 21:14:22 GMT

I'm trying to write a Python script that queries a hosted feature layer in AGOL, and then use returned records as the input for some arcpy geoprocessing commands to update a mosaic dataset. I am able to do the query in Pro if I manually the hosted feature layer to a map, and then just use the layer name as the input for arcpy.management.SelectLayerByAttribute.

However I'm having trouble figuring out how to create a "layer" object in Arcpy from a hosted feature layer. "Make Feature Layer" seems to work only for feature classes.

I'd prefer not to run the script as a Notebook using ArcGIS Python API as there are some local file system tasks that I want to handle.

Re: Create a Layer object for hosted feature layer

AlfredBaldenweck — Thu, 10 Mar 2022 22:42:35 GMT

Sorry, I had an error in my last post and wasn't sure how quickly I could correct it but here we are.

Add data from path, making sure to include the index#
Make layer from a selection by attributes
Remove original layer.

Not as clean as I imagine either of us would like, but it does work.

p = arcpy.mp.ArcGISProject("CURRENT") mapA = p.activeMap hostedFC = 'https://services1.arcgis.com/.../0' # The layer you're querying # Make sure to include the index number or else it'll grab you the group layer, and that won't work. hostLay= mapA.addDataFromPath(hostedFC) # Add data lyrAlias = hostLay.name + "_Selection" # Name the selection layer. arcpy.management.MakeFeatureLayer(hostLay, lyrAlias, "FID = 299") mapA.removeLayer(hostLay)

Hope this helps!

Edit: Don's answer is far more elegant.

Re: Create a Layer object for hosted feature layer

DonMorrison1 — Thu, 10 Mar 2022 22:33:34 GMT

You can create a layer from an AGOL hosted feature layer by referencing the hosted feature layer's URL. For example:

url = 'https://services2.arcgis.com/dJOijx2lWTlGQBDJ/arcgis/rest/services/CW_3863/FeatureServer/0' arcpy.management.MakeFeatureLayer(url, 'NewLayer')

Re: Create a Layer object for hosted feature layer

MichaelWen_Timmons — Thu, 10 Mar 2022 22:51:09 GMT

I got an "Input features: Dataset "https://services.arcgis.com..../FeatureServer" does not exist or is not supported" error.

Re: Create a Layer object for hosted feature layer

AlfredBaldenweck — Thu, 10 Mar 2022 22:55:20 GMT

Make sure to include the feature class's index number; right now you're pulling the group layer.

"https://services.arcgis.com..../FeatureServer/0"