If we go back and look at the list_poll() function that we just wrote, you can see that we have the Repo.all/1 query and that it gets passed into a Repo.preload/1 statement. Without really understanding what's going on here, this is all just going to feel a bit like magic. Nothing in Elixir should ever just be reduced to magic, so let's take a peek behind the curtains, so to speak.
In this case, when we call Repo.all, we're just passing it the name of the schema. If we run h Vocial.Repo.all in our IEx terminal, we'll see something like the following:
iex(2)> h Vocial.Repo.all@callback all(queryable :: Ecto.Query.t(), opts :: Keyword.t()) :: [Ecto.Schema.t()] | no_return()Fetches all entries from the data store ...
