Initial commit on Forgejo

Fresh repository history for elektrine/tarakan hosted at
https://git.elektrine.com/elektrine/tarakan.

lib/tarakan_web/changeset_errors.ex

@@ -0,0 +1,15 @@
+defmodule TarakanWeb.ChangesetErrors do
+  @moduledoc """
+  Renders an Ecto changeset's errors into a plain, JSON-encodable map for API
+  responses (field => list of interpolated messages).
+  """
+
+  @doc "Traverses `changeset` errors, interpolating `%{count}`-style placeholders."
+  def to_map(changeset) do
+    Ecto.Changeset.traverse_errors(changeset, fn {message, opts} ->
+      Regex.replace(~r"%{(\w+)}", message, fn _match, key ->
+        opts |> Keyword.get(String.to_existing_atom(key), key) |> to_string()
+      end)
+    end)
+  end
+end