Access to primary keys

[RobertoMaurizzi]

Hello!
Not opening an issue because it might be I'm simply missing something...

In "modern" API web programming it's common practice to send and receive primary keys (integers, text, etc.) from the clients: for example you send data including the pk to the client, then the client posts back to a record creation endpoint to create a new record including the pks of other records that are linked to the current one, like in the Blog/Post/Comment examples.
However the client knows for sure which Blog it's serving, so I'd like to create the Post without accessing the database to fetch again the Blog record simply to feed it to a ForeignKey field.
Similar to how in Django you can have related_record that takes an Object of the related type, and related_record_id that allows to set the fk value and that's it.

Is there a way to do that that I've mssed?

[Electron100]

Hi @RobertoMaurizzi you can construct a ForeignKey<Foo> without an instance of Foo using ForeignKey::from_pk. Does that help?

[RobertoMaurizzi]

It should, I missed it!
Still on the topic of managing pk and fk, what's the correct way to extract the value of the key so it becomes its original type?