I have successfully created an ItemGraph of my AGOL Organization. It is updated nightly. (Thanks to this notebook, and community feedback.)
I have been trying to Navigate the resultant ItemGraph with varying degrees of success.
I also have a List of AGOL Item IDs from another tool, that I was trying to use with the ItemGraph to make more sense of the former.
Given an ID from ListA (we'll call it ListA), Use the ItemGraph (let's call it org_graph, b/c that's its name) to Get information in a format more easy for me than the alphanumeric ID string:
for each ID in ListA:
a_Node=org_graph.get_node(ID)
a_Item=a_Node.item
item_title=a_Item.title
item_url=a_Item.homepage
print(f'{ID} {item_title} {item_url}')
And such a basic loop seemed to work okay, right up until it didn't.
I discovered IDs that led to Nodes that could not result in an Item.
Adding a try/catch pair into my loop allowed me to get results a bit more smoothly.
If a_Node.item were to create an error, the ID was added to a List called nonitems.
Now, I can loop through the nonitems List to get a bit more information:
for each ID in nonitems:
a_Node=org_graph.get_node(ID)
a_type=type(a_Node)
a_link=f'https://www.arcgis.com/home/item.html?id={ID}'
print(f'{ID} {a_type} {a_link}')
Herein lies the problem for me...
Most of the Nodes are of type <class 'NoneType'>, though there is also a <class 'arcgis.apps.itemgraph._item_graph.ItemNode'>.
The latter resolves into a "The item you requested cannot be found. The item may have been deleted or you may have entered an incorrect URL." statement.
The NoneType Nodes are invariably real things!
I have to visit each hyperlink via mouse-click to find this out though...
- CSV collection (from Survey123)
- Microsoft Excel (from Survey123)
- Data Pipeline
- Shapefile
- Web map
- Notebook
- Basemap
- etc.
Do you know any Pythonic way to determine what an ItemGraph Node might be, when the Notebook & GIS I'm using to interact with it thinks it is of NoneType?
AttributeError: 'NoneType' object has no attribute 'get_data'
