Update Hosted Feature Layer Using JSON from an API -- Not Working

GIS_utahDEM — Tue, 02 Jul 2024 15:58:14 GMT

Hello, I am trying to automate overwriting a polyline hosted feature layer using an API. I think I have the correct format for adding features via the json, but where I'm running into trouble is actually publishing/overwriting the features into the feature layer.

This is my main code, I am thinking that the issue is occuring in line 39:

# Main function to fetch API, decode polylines, and publish to ArcGIS Online def main(): # Make request to API response = requests.get(api_url) if response.status_code == 200: # Assuming API response is JSON with 'features' containing polyline data features = response.json() # Extract features from the API data #features = api_data.get('features', []) #if not features: # print("No features found in API response.") # return try: # Truncate existing features in the feature layer feature_layer.manager.truncate() # Prepare new features to add geojson_features = [] for feature in features: encoded_polyline = feature.get('EncodedPolyline') description = feature.get('Description') if encoded_polyline and description: # Decode polyline from 'EncodedPolyline' field decoded_polyline = decode_polyline(encoded_polyline) # Convert to GeoJSON Feature format geojson_feature = to_geojson_feature(decoded_polyline, description) geojson_features.append(geojson_feature) # Add new GeoJSON features to the feature layer print(json.dumps(geojson_features)) result = feature_layer.edit_features(adds=json.dumps(geojson_features)) print(f"Features updated successfully in ArcGIS Online hosted feature layer.") except Exception as e: print(f"Failed to update feature layer: {str(e)}") else: print("Failed to fetch data from API.")

The print(json.dumps(geojson_features) returns this:

[{"type": "Feature", "geometry": {"type": "LineString", "coordinates": [[40.77248, -111.8377], [40.77254, -111.83776], [40.7728, -111.83804], [40.7728, -111.83804], [40.77282, -111.83803], [40.77285, -111.83802], [40.77286, -111.83802], [40.77288, -111.83802], [40.77248, -111.8377]]}, "properties": {"Description": "Blue Detour"}}, {"type": "Feature", "geometry": {"type":.................

***I have removed most of the coordinates for simplicity, and only show the first feature though there are more

The error I get, which I believe is in reference to result = feature_layer.edit_features(adds=json.dumps(geojson_features)) is:

pass in features as list of Features, dicts or PropertyMap
Parameters not valid for edit_features

Re: Update Hosted Feature Layer Using JSON from an API -- Not Working

Clubdebambos — Mon, 30 Sep 2024 09:14:52 GMT

Hi @GIS_utahDEM,

The edit_features is expecting a FeatureSet, see docs here.

You would need to parse your GeoJSON to create a list of dictionaries that represent a FeatureSet and each Feature would look similar to the below. You could then feed the list of dictionaries (features) into the edit_features() method.

new_features = [ { "geometry": { # geometry details }, "attributes": { "str_att_name" : "attribute_value", "num_att_name" : 0 } } ]

Alternatively, take a look at the append() method which does allow GeoJSON to be appended.

Re: Update Hosted Feature Layer Using JSON from an API -- Not Working

GIS_utahDEM — Wed, 11 Dec 2024 16:27:50 GMT

@Clubdebambos Thank you! I eventually figured it out and posted about how to do it in case others were struggling with the same thing: https://community.esri.com/t5/arcgis-api-for-python-questions/a-timid-coder-s-guide-to-creating-a-polyline/m-p/1507007

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Update Hosted Feature Layer Using JSON from an API -- Not Working

Re: Update Hosted Feature Layer Using JSON from an API -- Not Working

Re: Update Hosted Feature Layer Using JSON from an API -- Not Working