Is it possible to modify data during importing/exporting?

[rayzhao99]

When importing/exporting data with the dexie-export-import (https://dexie.org/docs/ExportImport/dexie-export-import), it is possible to filter unwanted data. But, can we modify/change data yet?

A typical scenario (at least to us only) is to change the primary/foreign keys of the data. So when importing into an existed db, conflicts can be avoided.

It would also be appreciated if the filtering & modification can be fulfuled within one callback. For example, current filter() callback could be upgraded to support a similar behavior to the Collection.modify(), so the in-param of value could be modified then.

[dfahlander]

That's a nice idea, but unfortunately not possible with the current version.

Would a new transform callback be ok? It would have to support both inbound and outbound tables. One suggestion would be to let the optional transform callback return { value } for inbound keys and {key, value} for outbound keys.

[rayzhao99]

Sure, transform callback would also work for our cases.

So, how to filter & transform together during one importing/exporting? Providing the two callbacks simultaneously? Maybe it could be fulfiled by allowing transform to return falsy, which means the in-param of value is unwanted and should be omitted?

[dfahlander]

I briefly created a PR for a proposal to add transform to export and import. Should add a unit test also. Change suggestions and additional changes welcome. A unit test is still missing for it.

[rayzhao99]

Great! Thank you for a so quick response:)

[dfahlander]

[email protected] released recently with the transform option.