Im working with a database where table B has a foreign key (not null) referencing table A. A and B has a one-to-one relationship.
Furthermore the fk in Table B is created with the delete_all option
references(:A, on_delete: :delete_all)
most importantly, all deletions of b are done by deleting the corresponding a entry. Relying on the on the cascading delete functionality of the database.
Q:
Is there a nice way to implement a helper
def delete_b(b) do
# preload a,
# delete a
# return {:ok, b} with b.__meta__: #Ecto.Schema.Metadata<:deleted, "b">,
end
so that the b returned has the proper metadata state?
(I’ve resorted to a hack for now…
defp delete_b(b) do
b = Repo.preload(b, :a)
with {:ok, _deleted_a} <- Repo.delete(b.a) do
meta = Kernel.struct(%Ecto.Schema.Metadata{}, %{state: :deleted, source: "b"})
deleted_b = Kernel.struct(%B{}, %{id: b.id, __meta__: meta}))
{:ok, deleted_b}
else
err -> err
end
end
)
