I encountered the issue that if I create a model and then later want to add more columns to it (e.g. because the source table changed slightly) I sometimes cannot even add the model definition or at least I cannot use these new columns in existing Charts or Questions. I then ended up creating duplicates of the old model, but this leads to charts referring to inconsistent models.
According to the documentation I should be able to edit the model later on right? But the definition appeared to be completely empty like I was starting from scratch.
Since the hotswap of data sources is not available yet this was really frustrating.
I would have expected to be able to modify an existing model like you do with Data Studio or Superset.
I don't know if it's a bug, some weird caching issue or just how models currently behave....
Can anybody help me out?