Leo Doldan

I would also like this functionality, or the JSON one.

# +1

It happens in Windows too, as of 2022.

Having the same problem here but adding `unique: true` instead of `allowNull: false`. Any solution?

I think you have to use `queryInterface.removeConstraint` in order to make it work.

I'd advise against adding a fourth level here. There _are_ a lot of districts missing here, but they fit into a three-level structure. Examples: - Argentina => Ciudad de Buenos...

As I mentioned in another issue: > You can see a full, official, poorly formatted list, [here](https://www.geonames.de/couar-sub.html). You can probably extract them programmatically using `querySelectorAll`. Take into account that for...