Loop to all items of a Feature Layer using ArcPy

Manu — Mon, 24 Jan 2022 18:56:10 GMT

I have found some examples of how to iterate through the contents of a Feature Class. However, this does not work for a Feature Layer:

import arcpy
import arcgis
from arcgis.gis import GIS
gis = GIS(None, arcgis_usr, arcgis_pw, verify_cert = False)

search_result = gis.content.search("ArcGIS_content", "Feature Class")
item = search_result[0]
FeatureLayer = item.layers[0]

with arcpy.da.SearchCursor(FeatureLayer, ["OID@"]) as cursor:
for row in cursor:
    attachments_list = FeatureLayer.attachments.get_list(oid = row[0])
    if len(attachments_list) >= 1:
        print("Found", str(len(attachments_list)), "attachments")

Is there an efficient way to do what I tried here with a FeatureLayer; namely, to iterate through all of its features (in my case point features) and extract information (the idea is to download the attachments and save coordinates and some other attribute values)?

Re: Loop to all items of a Feature Layer using ArcPy

HuubZwart — Mon, 24 Jan 2022 21:45:59 GMT

You won't need a cursor for that. See feature layer documentation to query for objectIds and then list atttachments here and here.

Continuing from your script:

import arcpy import arcgis from arcgis.gis import GIS gis = GIS(None, arcgis_usr, arcgis_pw, verify_cert = False) search_result = gis.content.search("ArcGIS_content", "Feature Class") item = search_result[0] fl = item.layers[0] fs = fl.query(where="1=1", outFields="field1,field2") oidFieldName = "objectid" # replace when necessary oids = [f.attributes[oidFieldName] for f in fs.features] attachments = [fl.attachments.get_list(oid=oid)} for oid in oids]

attachments is a list of lists, where the nested list is shaped like this (for each oid):

[{'contentType': 'image/png', 'id': 1, 'name': 'AppTemplate.png', 'parentObjectId': 1, 'size': 1394}, {'contentType': 'image/png', 'id': 2, 'name': 'AppTemplate.png', 'parentObjectId': 1, 'size': 1394}, {'contentType': 'image/png', 'id': 4, 'name': 'AppTemplate.png', 'parentObjectId': 1, 'size': 1394}]

You can download these using:

import os local_path = "SOME_FOLDER" for attachment_list in attachments: for attachment in attachment_list: fl.attachments.download(save_path=os.path.join(local_path, attachment['name']), oid=attachment['parentObjectId', attachment_id=attachment['id'])

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Loop to all items of a Feature Layer using ArcPy

Re: Loop to all items of a Feature Layer using ArcPy