Get your ArcGIS Online Feature Layer OID Field Name with the ArcGIS API for Python
Glen Bambrick
Table of Contents
The Video
Introduction
The OID field for your feature layer in ArcGIS Online might be called OBJECTID, it could also be OID, FID, or any other name that you have given it. This can make it difficult to create a script to process data that may not have a standard OID field name you expect. With the ArcGIS API for Python we can inspect the JSON for the feature layer and retrieve the objectIdField property value.
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arcgis modules
The API provides access to your organisations ArcGIS Online via the GIS class in the gis module. This GIS class is the gateway to ArcGIS Online. We will also utilise the FeatureLayer class that will enable us to get the OID Field of a Feature Layer in ArcGIS Online.
## provides access to ArcGIS Online
from arcgis.gis import GIS
## the FeatureLayer class
from arcgis.features import FeatureLayer
Accessing ArcGIS Online
GIS class. There are a handful of ways to achieve access, if you are logged into your ArcGIS Online in ArcGIS Pro you can simply use "home", otherwise, another common way is to provide the ArcGIS Online URL, followed by your username and password.
## Access AGOL
agol = GIS("home")
## Access AGOL
agol = GIS(
url = "https://your_organisation.maps.arcgis.com/",
username = "Your_Username",
password = "Your_Password"
)
Required inputs
Only one required parameter, the url to the Feature Layer, although you can access and create the Feature Layer object any way you wish to.
## the URL to the Feature Layer
fl_url = "FEATURE_LAYER_URL"
Create the FeatureLayer object
We create a FeatureLayer object from the user provided URL. You can create a FeatureLayer object in a number of ways such as using the layers property for a Feature Service Item object or via a FeatureLayerCollection object, The choice is yours.
fl = FeatureLayer(
url = fl_url,
gis = agol
)
Get the objectIdField from the FeatureLayer properties
The FeatureLayer object has a property called properties that holds a host of information and configurations relating to the Feature Layer in ArcGIS Online. We are interested in the objectIdField property that will return the name of the OID field as a string.
oid_field = fl.properties.objectIdField
print(oid_field)
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All the code in one place
You can find the entire code workflow below with links to important components in the documentation that were used.
from arcgis.gis import GIS
from arcgis.features import FeatureLayer
################################################################################
## API Reference Links:
## https://developers.arcgis.com/python/latest/api-reference/arcgis.gis.toc.html#gis
## https://developers.arcgis.com/python/latest/api-reference/arcgis.features.toc.html#featurelayer
## https://developers.arcgis.com/python/latest/api-reference/arcgis.features.toc.html#arcgis.features.FeatureLayer.properties
##
################################################################################
################################################################################
## ACCESS ARCGIS ONLINE ########################################################
agol = GIS("home")
################################################################################
## USER INPUT ##################################################################
## the URL to the Feature Layer
fl_url = "FEATURE_LAYER_URL"
################################################################################
## CREATE A FEATURELAYER OBJECT ################################################
fl = FeatureLayer(
url = fl_url,
gis = agol
)
################################################################################
## GET OID FIELD NAME ##########################################################
print(fl.properties.objectIdField)
################################################################################
print("\nSCRIPT COMPLETE")
