Allow accessing enum value names via methods

guides/type_definitions/enums.md

@@ -72,3 +72,9 @@ value "AUDIO", value: :audio
 Then, GraphQL inputs of `AUDIO` will be converted to `:audio` and Ruby values of `:audio` will be converted to `"AUDIO"` in GraphQL responses.
 
 Enum classes are never instantiated and their methods are never called.
+
+You can get the GraphQL name of the enum value using the method matching its downcased name:
+
+```ruby
+Types::MediaCategory.audio # => "Audio"
+```

lib/graphql/schema/enum.rb

@@ -67,6 +67,7 @@ class << self
         def value(*args, **kwargs, &block)
           kwargs[:owner] = self
           value = enum_value_class.new(*args, **kwargs, &block)
+          singleton_class.define_method(value.graphql_name.downcase) { value.graphql_name }
           key = value.graphql_name
           prev_value = own_values[key]
           case prev_value

spec/graphql/schema/enum_spec.rb

@@ -10,6 +10,18 @@
     end
   end
 
+  describe "value methods" do
+    it "defines methods to fetch graphql names" do
+      assert_equal enum.string, "STRING"
+      assert_equal enum.woodwind, "WOODWIND"
+      assert_equal enum.brass, "BRASS"
+      assert_equal enum.percussion, "PERCUSSION"
+      assert_equal enum.didgeridoo, "DIDGERIDOO"
+      assert_equal enum.keys, "KEYS"
+      assert_equal enum.silence, "SILENCE"
+    end
+  end
+
   describe "type info" do
     it "tells about the definition" do
       assert_equal "Family", enum.graphql_name