Merge branch 'make_graphql_enums_slightly_nicer' into 'master'

Make GraphQL enums a little bit nicer

See merge request gitlab-org/gitlab!19998

app/graphql/types/base_enum.rb

@@ -2,5 +2,18 @@
 
 module Types
   class BaseEnum < GraphQL::Schema::Enum
+    class << self
+      def value(*args, **kwargs, &block)
+        enum[args[0].downcase] = kwargs[:value] || args[0]
+
+        super(*args, **kwargs, &block)
+      end
+
+      # Returns an indifferent access hash with the key being the downcased name of the attribute
+      # and the value being the Ruby value (either the explicit `value` passed or the same as the value attr).
+      def enum
+        @enum_values ||= {}.with_indifferent_access
+      end
+    end
   end
 end

spec/graphql/types/base_enum_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Types::BaseEnum do
+  describe '#enum' do
+    let(:enum) do
+      Class.new(described_class) do
+        value 'TEST', value: 3
+        value 'other'
+        value 'NORMAL'
+      end
+    end
+
+    it 'adds all enum values to #enum' do
+      expect(enum.enum.keys).to contain_exactly('test', 'other', 'normal')
+      expect(enum.enum.values).to contain_exactly(3, 'other', 'NORMAL')
+    end
+
+    it 'is a HashWithIndefferentAccess' do
+      expect(enum.enum).to be_a(HashWithIndifferentAccess)
+    end
+  end
+end