Latest Contributions by EarlMedina

Let's say you have a Hosted Feature Layer named worldEQ which contains data on Earthquakes that have occurred throughout the world for the last 50 years: You wish to create a view named worldEQView from this Hosted Feature Layer. To do that, you could use the following snippet: from arcgis import GIS from arcgis.features import FeatureLayerCollection gis = GIS("https://www.arcgis.com", "username","password") # Search for Source Hosted Feature Layer source_search = gis.content.search("world_earthquakes")[0] source_flc = FeatureLayerCollection.fromitem(source_search) # Create View from Source Hosted Feature Layer new_view = source_flc.manager.create_view(name="worldEQView")‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ This works out great and your view is created: Let's suppose you next want to use the view to show only earthquakes that occurred before the year 1988. Reviewing the Data tab of the view's Item Details, you see that you can filter by a column year_: When you set a View Definition, that definition is defined at the service level. If you quickly set a test definition in the ArcGIS Online/Portal for ArcGIS user interface and take a look at the view service's Service Definition, you'll see the property that needs to be updated is viewDefinitionQuery: Click on 'View' in the View's Item Details page Next, click on the Layer: Click on 'JSON' Scroll all the way to the bottom to see the 'viewDefinitionQuery' property: Note: changing the value of viewDefinitionQuery also updates the related definitionQuery property To update the viewDefinitionQuery property with the ArcGIS API for Python, you do the following: # Search for newly created View view_search = gis.content.search("worldEQView")[0] view_flc = FeatureLayerCollection.fromitem(view_search) # The viewDefinitionQuery property appears under layers view_layer = view_flc.layers[0] # Define a SQL query to filter out events past 1988 view_def = {"viewDefinitionQuery" : "year_ < 1988"} # Update the definition to include the view definition query view_layer.manager.update_definition(view_def)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ You should be able to see this update reflected after refreshing the view Item Details page > Visualization Altogether, the script to create a View from the Hosted Feature Layer and then to set a View Definition is: from arcgis import GIS from arcgis.features import FeatureLayerCollection gis = GIS("https://www.arcgis.com", "username","password") # Search for Source Hosted Feature Layer source_search = gis.content.search("world_earthquakes")[0] source_flc = FeatureLayerCollection.fromitem(source_search) # Create View from Source Hosted Feature Layer new_view = source_flc.manager.create_view(name="worldEQView") # Search for newly created View view_search = gis.content.search("worldEQView")[0] view_flc = FeatureLayerCollection.fromitem(view_search) # The viewDefinitionQuery property appears under layers view_layer = view_flc.layers[0] # Define a SQL query to filter out events past 1988 view_def = {"viewDefinitionQuery" : "year_ < 1988"} # Update the definition to include the view definition query view_layer.manager.update_definition(view_def)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ This can be generalized into a standalone script like this one: import sys from arcgis import GIS from arcgis.features import FeatureLayerCollection def search_layer(conn,layer_name): search_results = conn.content.search(layer_name, item_type="Feature Layer") proper_index = [i for i, s in enumerate(search_results) if '"' + layer_name + '"' in str(s)] found_item = search_results[proper_index[0]] flc = FeatureLayerCollection.fromitem(found_item) return flc def create_view(conn, source_flc, view_name, layer_index, view_def): new_view = source_flc.manager.create_view(name=view_name) # Search for newly created View view_flc = search_layer(conn, view_name) # The viewDefinitionQuery property appears under layers view_layer = view_flc.layers[layer_index] # Update the definition to include the view definition query view_layer.manager.update_definition(view_def) print("View created") def main(): conn = GIS("https://www.arcgis.com", "username", "password") # Index of the Layer to be filtered layer_index = 0 # Define a SQL query to filter out events past 1988 view_def = {"viewDefinitionQuery" : "year_ < 1988"} # Search for target Hosted Feature Layer source_flc = search_layer(conn, "world_earthquakes") # Create View from Hosted Feature Layer create_view(conn, source_flc, "worldEQView", layer_index, view_def) if __name__ == '__main__': sys.exit(main())‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ If you need to define an area of interest, this would be approached like so: view_def = {"viewLayerDefinition":{"filter":   {"operator":"esriSpatialRelIntersects","value": {"geometryType":"esriGeometryEnvelope","geometry": {"xmin":4485937.7074932605,"ymin":1543545.165101517, "xmax":9417043.276225261,"ymax":6239836.182941515, "spatialReference":{"wkid":102100,"latestWkid":3857}}}}}} view_layer.manager.update_definition(update_dict) For further information on how to define an area of interest, please see this post by Egge-Jan Pollé : https://community.esri.com/people/EPolle_TensingInternational/blog/2019/03/27/create-view-from-hosted-feature-layer-and-define-area-of-interest  ... 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