Add FeatureFlag.all (#16496)

app/services/feature_flag.rb

@@ -44,5 +44,13 @@ module FeatureFlag
 
       enabled?(feature_flag_name, *args)
     end
+
+    # Retrieve a list of all currently defined flags and their status. This is
+    # primarily intended for development and wraps +Flipper.features+.
+    #
+    # @return [Hash<Symbol, Symbol>] the defined flags with their status (+:on+ or +:off+).
+    def all
+      Flipper.features.to_h { |feature| [feature.name.to_sym, feature.state] }
+    end
   end
 end

spec/services/feature_flag_spec.rb

@@ -99,4 +99,14 @@ describe FeatureFlag, type: :service do
       end
     end
   end
+
+  describe ".all", :aggregate_failures do
+    it "returns a hash with all feature flags and their status" do
+      described_class.enable(:flag1)
+      expect(described_class.all).to eq({ flag1: :on })
+
+      described_class.disable(:flag2)
+      expect(described_class.all).to eq({ flag1: :on, flag2: :off })
+    end
+  end
 end