I think that this can be done as a library. I’ve contributed to one
https://github.com/byjpr/MapRewire that works pretty well. I’ve got another
library that I need to extract from our source code and release as a
package, but it *could* probably be extended (trivially) to allow key
renames as well as its current function (safe atomization of map keys as
well as case conversion).
-a
On Mon, Aug 17, 2020 at 5:35 PM Jonathan Arnett <jonarnet...@gmail.com>
wrote:
> I often times find myself in situations where I need to rename one or more
> keys in a Map, when for instance, converting from Strings to Atoms:
>
> new_map = %{
> foo: Map.fetch!(old_map, "foo"),
> bar: Map.fetch!(old_map, "bar"),
> ...
> }
>
> or otherwise taking a Map from one part of the system and renaming keys to
> make it work in another part of the system:
>
> new_map = %{
> user_id: post.author_id,
> content: post.body,
> ...
> }
>
> With a Map.rename_key/3 function, we could instead write:
>
> new_map =
> old_map
> |> Map.rename_key("foo", :foo)
> |> Map.rename_key("bar", :bar)
> ...
>
> or:
>
> new_map =
> post
> |> Map.rename_key(:user_id, :author_id)
> |> Map.rename_key(:body, :content)
> ...
>
> In the situation that you're performing a bulk update of key names (as
> seems to be implied above), Map.rename_keys/3 makes more sense:
>
> new_map = Map.rename_keys(old_map, %{"foo" => :foo, "bar" => :bar, ...})
>
> or:
>
> new_map = Map.rename_keys(post, %{author_id: :user_id, body: :content,
> ...})
>
> With the Map.rename_key[s]/3 functions, the intent is very explicit, and
> induces less cognitive load to understand.
>
> Renaming Map keys is a situation I run into at least monthly, and I do
> wonder whether the rest of the community has this problem as well so as to
> make it a worthwhile addition.
>
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--
Austin Ziegler • halosta...@gmail.com • aus...@halostatue.ca
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