How to build WHERE IN array clause with Ecto?

Question

How to find posts in given List of ids?

This isn\'t working:

posts = Post |> where(id: [1, 2]) |> Repo.all

Example in Rails:

Answer 1

Accepted answer gives undefined function p/0 to me, so I came to this:

from(p in Post, where: p.id in [1, 2]) |> Repo.all