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Update all View Layers to Match Updated Hosted Feature Layer Fields

GIS_utahDEM

Hello! I have a Hosted Feature Layer with a large number of views (one for each jurisdiction in my state). I have made some updates to the main hosted feature layer (added a couple of fields), and I want to update all of the hosted feature layer views to match. I am trying to update by getting the fields from the main layer and using an update dictionary. My code runs, but when I open a view layer in AGOL the fields have not been updated. I've attached the relevant code I'm using below, particularly in rows 1-2 & 26-34:

import json
fields = ucip_properties.fields

# Loop through the regional division to create the views
for index, county in enumerate(counties_munis):
    county_name = counties_munis.features[index].attributes['NAME']
    print(county_name)
    view_name = 'UCIP_' + county_name + "_LIVE_View"
    print(view_name)
    # Get the geometry for the regions
    view_geom = counties_munis.features[index].geometry.get('rings')
    name_avail = cm.is_service_name_available(service_name = view_name,service_type = "featureService")
    # Check if view exists
    if  name_avail == True:
       # CODE TO CREATE VIEW
    else:
        print(view_name," Exists")
        # Search for newly created View
        view_search = my_agol.content.search(view_name)[0]
        view_flc = FeatureLayerCollection.fromitem(view_search)

        service_layer = view_flc.layers[0]
        layerTags = [county_name,view_name,"UCIP","View Layer"]
        

        # Populate the update_dict with tags and fields
        dict_fields = json.loads(f'{fields}')
        print(dict_fields)
        update_dict = {"tags":layerTags,"fields":dict_fields}
        #print(service_layer.properties.tags)

        # Update the definition to include the tags
        view_search.update(update_dict)
        print("Added tags to ",view_name)


print('Done!')

ideas? thoughts? alternative solutions? thanks!!

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Accepted answers

MarkTorrey

If you want all the fields and not a subset then you should be able to do something like this:

layerTags = [county_name, view_name, "UCIP", "View Layer"]

# Populate the update_dict with tags and fields
dict_fields = [{"name":f"{f.name}", "visible":True} for f in fields]
print(dict_fields)
update_dict = {"tags": layerTags, "fields": dict_fields}

All comments

GIS_utahDEM

Thanks! Would that impact anything about the fields (i.e. domains/lists), I'm not very familiar with this and from how I understand the code it would only carry over the field names and nothing else?

I am just trying to update all the views to match the original -- so if I add or delete a few fields on the original, I want to be able to run this so all the views stay up to date.

MarkTorrey

If you want all the fields and not a subset then you should be able to do something like this:

layerTags = [county_name, view_name, "UCIP", "View Layer"]

# Populate the update_dict with tags and fields
dict_fields = [{"name":f"{f.name}", "visible":True} for f in fields]
print(dict_fields)
update_dict = {"tags": layerTags, "fields": dict_fields}

GIS_utahDEM

This is what "fields" looks like:

This is what "dict_fields" looks like

I am looping through each view, with the specific information about that view captured in lines 19-22

MarkTorrey

Hi @GIS_utahDEM, What's the format of your `fields` variable? It will need to be a list of key, value pairs.

dict_fields = [{"name": fieldName, "visible":True/False},...].

Here's a small example that updates the fields of an existing view by iterating through the original layers fields and adding only a subset.

from arcgis.gis import GIS

# Set up some variables
params = {
    "view_id": "e1fa73f21d0e42e9b208114ccdce04a1", # id of existing view
    "include_fields": ["apn", "usetype", "roll_landv"] # limit the fields we want in the view to these three
}
# connect
portal = GIS(username="USERNAME", password="PASSWORD")
print(f"logged in to {portal.properties.name} as {portal.properties.user.username}")

# Get the existing view by item id
view = portal.content.get(params["view_id"])

# Get a reference to the source feature layer,
source_fl = view.related_items("Service2Data")[0]

# Get a list of all the fields on the source feature layer
source_flds = source_fl.layers[0].properties.fields

# create a list of key, value (name, visible) objects representing the subset of fields from the source layer we want included in the view
vis_flds = [{"name":f"{f.name}", "visible": True} if f.name in params["include_fields"] or f.type == "esriFieldTypeOID" else {"name":f"{f.name}", "visible": False} for f in source_flds]

# update the view definition with our new list
view.layers[0].manager.update_definition({"fields": vis_flds})

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