Upserts in Ecto using `Ecto.Multi`

upsert_profile.ex

defp upsert_profile(multi, source, source_uuid, profile_url) do
  profile = %Profile{
    source: source,
    source_uuid: source_uuid,
    profile: profile_url,
  }

  Ecto.Multi.insert(multi, source_uuid, profile, on_conflict: [set: [profile: profile_url]], conflict_target: [:source, :source_uuid])
end

# usage
members
|> Enum.reduce(Ecto.Multi.new, fn (member, multi) -> upsert_profile(multi, "athlete", member.athlete_uuid, member.profile) end) 
|> Repo.transaction