Multiple foreign keys to same table using Elixir

I am new to ORMs in general. I have a table (lets call it Entity) with columns --

1. ID
2. expression
3. type ( can be 'long_word', 'short_word' or 'sentence' )

Often, the first two types occur in a 'sentence', so, I want to maintain another开发者_如何学Python table which maps 'Sentences' to 'long_word' or 'short_word' using the 'ID' field.

All i need is another table with 2 'Integer fields' referring to 'ID' as a foreign key.

But, how do i do this in Elixir?

Edit : I was afraid it will come to this eventually. No sweat, SQLAlchemy is solid, it will be worth it in the long run. But i really wish Elixir had worked. Cant have everything the way you want.

Thanks a lot...