Nevermind, I kept researching, and while I didn't find the same exact proposal, I did encounter things down the rabbit hole that changed my mind.
I think Andrea's criticism of short_maps(https://andrealeopardi.com/posts/a-story-of-regret-and-retiring-a-library-from-hex/#why-i-don-t-like-short-maps) applies here too. Gonna shortcut the year of learning, accept his wisdom, and withdraw. On Tuesday, July 25, 2023 at 6:23:35 PM UTC-4 Joe Martinez wrote: > I have a feeling there's probably a better way to do this, but I couldn't > find it in the history. > > This would let you do something like this: > iex> users = [%{name: "john", age: 27, employment: %{title: "Developer", > salary: 100}}, %{name: "meg", age: 23, employment: %{title: "Manager", > salary: 200}}] > iex> get_in(users, [Access.all(), Access.keys([:name, employment: > [:title]])]) > [%{employment: %{title: "Developer"}, name: "john"}, %{name: "meg", > employment: %{title: "Manager"}}] > > With keys partially implemented like this > def keys(keys) do > fn > :get, data, next -> > next.(take(data, keys)) > > :get_and_update, data, next -> > values = take(data, keys) > > case next.(values) do > {values, :pop} -> {values, Map.drop(data, keys)} > {values, updates} -> {values, updates} > end > end > end > > And then that `take` function something like this: > @doc """ > ## Examples > iex> Access.take(%{name: "john", age: 52}, [:name, :age, :height]) > %{name: "john", age: 52} > > iex> Access.take(%{name: "john", age: 52, employment: %{title: > "Developer", salary: 100}}, [:name, :height, employment: [:title]]) > %{name: "john", employment: %{title: "Developer"}} > """ > def take(container, keys) when is_list(keys) do > cond do > Enum.all?(keys, &is_atom/1) and is_map(container) -> > Map.take(container, keys) > > is_map(container) -> > keys > |> Enum.group_by(&is_atom/1) > |> Enum.reduce(%{}, fn > {true, keys}, map -> > Map.merge(map, Map.take(container, keys)) > > {false, pairs}, map -> > Map.merge( > map, > for({k, v} <- pairs, into: %{}, do: {k, > take(Map.get(container, k), v)}) > ) > end) > end > end > > def take(_container, keys) when is_list(keys) do > raise ArgumentError, "Access.take expects the keys to be a list of atoms > or keyword list, got: " <> inspect(keys) > end > -- You received this message because you are subscribed to the Google Groups "elixir-lang-core" group. To unsubscribe from this group and stop receiving emails from it, send an email to elixir-lang-core+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/elixir-lang-core/560b0f5c-997e-4e78-bfb6-b2019457ea14n%40googlegroups.com.
