Add functionality to add and edit related records for many-to-many relationships in ArcGIS Online forms.
We have a many-to-many feature layer with organizations and contacts and would like to create an editable form in ArcGIS Online so that users can edit organizations and their contacts. For example, if a user selects an organization, they should be able to add and edit its contacts.
We saw in this post that the globalid field needed to be lowercase, so we rebuilt the geodatabase with GlobalID changed to globalid for the feature classes and tables, but were still not able to edit the related records in ArcGIS Online.
The closest existing ArcGIS Idea is Dynamic one-to-many relationship.
From talking with Esri, it is our understanding that many-to-many relationships are not supported in ArcGIS Online forms. It needs to be a one-to-one or one-to-many, and the parent of the relationship needs to be a feature layer. We hope Esri can add support in ArcGIS Online forms for editing many-to-many relationships.
