Loop to all items of a Feature Layer using ArcPy

Manu

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)?

HuubZwart

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'])