How can I see the raw SQL generated for an Ecto.Query?

Question

I have an Ecto.Query and a Repo, such that I can call Repo.all(query) and get results. However, the results are not what I expect.

Answer 1

to_sql/2 is added to the module you use Ecto.Repo on. By convention, that module would be named MyApp.Repo (MyApp would be your app's name). Internally, it would use Ecto.Adapters.SQL.to_sql/3, but Ecto.Adapters.SQL is more of an internal module.

Using it would look like:

iex> query = Ecto.Query.where(Post, [p], p.views > 10)
iex> MyApp.Repo.to_sql(:all, query)
{"SELECT p.id, p.title, p.inserted_at, p.created_at FROM posts as p WHERE p.views > $1", [10]}