The changeset for the initial version of a Media schema will be created by the create_initial_changeset/4 function exposed by the Storage.Media module.
Given that the database does not know what KSUIDs are, we generate a unique identifier at this stage. It will also be used to generate a storage_key, that is the actual name of the file stored on the cloud storage:
$ cat apps/elixir_drip/lib/elixir_drip/storage/media.exdefmodule ElixirDrip.Storage.Media do use Ecto.Schema alias __MODULE__ alias Ecto.Changeset # ... def create_initial_changeset(user_id, file_name, full_path, file_size) do id = Ksuid.generate() attrs = %{ id: id, user_id: user_id, storage_key: generate_storage_key(id, file_name), encryption_key: Encryption.generate_key(), ...
