3
The Join Features tool seems to have worked:
Steps:
Add a feature layer to a web map by using the Join Features tool.
Note: I couldn't find the Content --> Analysis button in the new Web Map Viewer (Beta).
I had to use the classic Web Map Viewer instead.
Create an application to authorize HTTP requests to AGOL
Query an ArcGIS Online FC via an HTTP ...
2
I'd say join field is the tool you need. To test it I created 3 identical tables named "A","B","C":
after running this script:
import arcpy
for i,letter in enumerate("ABC"):
if i==0:
first = letter
else:
arcpy.AddMessage("Joining %s to %s" %(letter,first))
arcpy.management....
1
You did create a join, not a relation.
Joins and a relations are different things. A join (layer based) does add attributes from another layer based on a 1:1 or 1:0 cardinality relationship, but in the described case you have a 1:n relationship (1 project : n trees).
The behavior you need can be achieved via Project > Properties... > Relations. Add a ...
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