Versions Used
Kaffy: 0.9.0
Phoenix: 1.5.7
Elixir: 1.11.2

What's actually happening?
Creating a new resource of a schema that contains an embedded_schema without an id will result in an error key :id not found in ... (see screenshot below).

What should happen instead?
The create/update should not expect a primary_key or id key to be set for the embedded_schema if it was defined it should not use one.

Workaround
Removing the @primary_key false makes everything work properly but an Id field will be added to the form which I don't need.

Screenshots

Happy to help @aesmail, let me know if this makes sense or I am doing something I shouldn't 💪