Cqrs.ValueObject.handle_validate

You're seeing just the callback handle_validate, go back to Cqrs.ValueObject module for more information.

handle_validate(arg1, keyword)

handle_validate(
  Ecto.Changeset.t(),
  keyword()
) :: Ecto.Changeset.t()

Allows one to define any custom data validation aside from casting and requiring fields.

This callback is optional.

Invoked when the new() or new!() function is called.