Stringify keys when reading from Hash source

lib/config_x/hash_source.rb

@@ -7,11 +7,26 @@ class HashSource < Source
     attr_reader :source
     protected :source
 
+    class << self
+      def deep_stringify_keys(hash)
+        hash.each_with_object({}) do |(key, value), acc|
+          acc[key.to_s] =
+            if Hash === value
+              deep_stringify_keys(value)
+            else
+              value
+            end
+        end
+      end
+    end
+
     def initialize(source)
       @source = source
     end
 
-    def load = source
+    def load
+      self.class.deep_stringify_keys(source)
+    end
 
     def ==(other)
       other.is_a?(self.class) && source == other.source

sig/config_x/hash_source.rbs

@@ -1,6 +1,8 @@
 
 module ConfigX
   class HashSource < Source
+    def self.deep_stringify_keys: [T] (Hash[(String | Symbol), T])-> Hash[String, T]
+
     def initialize: (Source::config_hash) -> void
 
     attr_reader source: Source::config_hash

spec/config_x/config_factory_spec.rb

@@ -31,22 +31,50 @@
       end
 
       around do |example|
-        settings__three = ENV["SETTINGS__THREE"]
-        ENV["SETTINGS__THREE"] = "environment variable"
+        settings__three = ENV["SETTINGS__ONE__THREE"]
+        ENV["SETTINGS__ONE__THREE"] = "environment variable"
         example.run
-        ENV["SETTINGS__THREE"] = settings__three
+        ENV["SETTINGS__ONE__THREE"] = settings__three
       end
 
       it "loads config files in order" do
         is_expected.to have_attributes(
-          one: "settings/development.local.yml",
-          two: "settings/development.local.yml",
-          three: "environment variable",
+          one: have_attributes(
+            two: "settings/development.local.yml",
+            three: "environment variable"
+          ),
           four: "settings.local.yml",
           five: "settings/development.yml",
           six: "settings.yml"
         )
       end
     end
   end
+
+  describe '#load' do
+    subject(:config_factory) do
+      described_class.new(
+        "development",
+        config_root: "spec/support/config"
+      ).load(*additional_sources)
+    end
+
+    let(:additional_sources) do
+      [
+        {one: { two: "additional hash source"} },
+      ]
+    end
+
+    it "loads config files in order" do
+      is_expected.to have_attributes(
+        one: have_attributes(
+          two: "additional hash source",
+          three: "settings/development.local.yml",
+        ),
+        four: "settings.local.yml",
+        five: "settings/development.yml",
+        six: "settings.yml"
+      )
+    end
+  end
 end

spec/config_x/hash_source_spec.rb

@@ -13,4 +13,12 @@
   end
 
   it { expect(config).to eq(hash) }
+
+  context "when keys are symbols" do
+    let(:hash) { { four: { bar: 42 } } }
+
+    it "deep stringifies keys" do
+      expect(config).to eq("four" => {"bar" => 42})
+    end
+  end
 end

spec/support/config/settings.local.yml

@@ -1,5 +1,5 @@
 ---
-one: settings.local.yml
-two: settings.local.yml
-three: settings.local.yml
+one:
+  two: settings.local.yml
+  three: settings.local.yml
 four: settings.local.yml

spec/support/config/settings.yml

@@ -1,7 +1,7 @@
 ---
-one: settings.yml
-two: settings.yml
-three: settings.yml
+one:
+  two: settings.yml
+  three: settings.yml
 four: settings.yml
 five: settings.yml
 six: settings.yml

spec/support/config/settings/development.local.yml

@@ -1,4 +1,4 @@
 ---
-one: settings/development.local.yml
-two: settings/development.local.yml
-three: settings/development.local.yml
+one:
+  two: settings/development.local.yml
+  three: settings/development.local.yml

spec/support/config/settings/development.yml

@@ -1,6 +1,6 @@
 ---
-one: settings/development.yml
-two: settings/development.yml
-three: settings/development.yml
+one:
+  two: settings/development.yml
+  three: settings/development.yml
 four: settings/development.yml
 five: settings/development.yml