Thanks Mark, Any updates you provide would be helpful. I think that many people (myself included) will be happy to see this functionality make it to Collector and Explorer.
I have been informed that this is being actively worked on for ArcGIS Runtime 100.8 Releases of Esri field apps should pick this up later this year.
FeatureSetByRelationshipName() works in Collector. I just setup an Attribute rule calculation that queryies the parent layer in the relationship and populates attributes on the child record accordingly.
Downfall is that you can't take the map offline in Collector So close...
Hi Dan, I am trying to get ANYTHING to work at this point. Seems that even the Sum($layer,'field') function doesn't work. I cant get FeatureSetByRelationshipName to work, either. Do you have sample code that you can provide for what you were successful with? I, very simply, need to summarize data. This is maddening! I am using the new version of Collector on an iPad.