Hello,

I want to report a bug related to adding attachments to a feature in an ArcGIS Enterprise Feature Service using the ArcGISAttachmentConnector in the latest version.

I receive the following error:

(C:\Users\x\AppData\Roaming\Safe Software\FME\Packages\25606-win64\python\safe.esri-agol\fmepy_esri_agol\attachments\handler.py:104) add_attachment
    return AttachmentResult.from_dict(response.get("addAttachmentResult", {}))
                                      ^^^^^^^^^^^^
910523  Python Exception <AttributeError>: 'generator' object has no attribute 'get'

The problem is that the ArcGIS REST API addAttachment endpoint returns text/html instead of json. This appears to happen specifically for Enterprise Feature Services, as described here. As a result, the result cannot be decoded. However, the attachment is actually uploaded successfully.

Bug fix:

Change the line 43 from

files = {"attachment": (filename, file_obj, mime_type))}

to

files = {"attachment": (filename, file_obj, mime_type), "f": (None, "json")}

in C:\Users\x\AppData\Roaming\Safe Software\FME\Packages\25606-win64\python\safe.esri-agol\fmepy_esri_agol\attachments\api.py

I just tested addAttachment but it may also occur for updateAttachment.

Esri ArcGIS Connector: https://hub.safe.com/publishers/safe/packages/esri-agol/versions/3.9.5

FME(R) 2025.1.0.0 (20250704 - Build 25606 - WIN64)

ArcGIS Enterprise 11.5