Using storage_dir in Waffle and Waffle Ecto

# My AvatarUploader
# Override the storage directory:
def storage_dir(_version, {_file, scope}) do
  "uploads/user/avatars/#{scope.id}"
end

# My User schema
use Waffle.Ecto.Schema

  schema "users" do
    field :avatar, Allychat.Uploaders.AvatarUploader.Type
    field :email, :string
    field :password, :string, virtual: true, redact: true
    field :hashed_password, :string, redact: true
    field :confirmed_at, :naive_datetime

    timestamps()
  end

  def avatar_changeset(user, attrs) do
    user
    |> cast(attrs, [:avatar])
    |> cast_attachments(attrs, [:avatar])
    |> validate_required([:avatar])
  end

# My Accounts context
def change_user_avatar(user, attrs \\ %{}) do
  User.avatar_changeset(user, attrs)
end

def update_user_avatar(user, attrs) do
  changeset =
    user
    |> User.avatar_changeset(attrs)

  Ecto.Multi.new()
  |> Ecto.Multi.update(:user, changeset)
  |> Repo.transaction()
  |> case do
    {:ok, %{user: user}} -> {:ok, user}
    {:error, :user, changeset, _} -> {:error, changeset}
  end
end

When I do this, it tells me that it can’t find id in nil. I tried a lot of options, also the one from waffle_ecto docs, and still couldn’t find an answer on how to upload an image to the storage_dir.

Does anyone know what I can do to fix this? I’m pretty new to Waffle

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