diff --git a/lib/api_taster/form_builder.rb b/lib/api_taster/form_builder.rb
index 7c794c6..10c8f19 100644
--- a/lib/api_taster/form_builder.rb
+++ b/lib/api_taster/form_builder.rb
@@ -26,15 +26,15 @@ def add_to_buffer(params, parent_labels = [])
 
         new_parent_labels = parent_labels.clone << label
 
-        if value.is_a?(Hash)
+        case value
+        when Hash
           add_legend_to_buffer(parent_labels, label)
-
           add_to_buffer(value, new_parent_labels)
-        elsif value.is_a?(Array)
+        when Array
           value.each do |v|
-            if v.is_a?(Hash)
+            case v
+            when Hash
               add_legend_to_buffer(parent_labels, label)
-
               add_to_buffer(v, parent_labels.clone << "#{label}[]")
             else
               add_element_to_buffer(parent_labels, "#{label}[]", v)
diff --git a/lib/api_taster/route.rb b/lib/api_taster/route.rb
index 521e6fb..1d12b97 100644
--- a/lib/api_taster/route.rb
+++ b/lib/api_taster/route.rb
@@ -38,10 +38,12 @@ def normalise_routes!
           next if route.app.is_a?(Sprockets::Environment)
           next if route.app == ApiTaster::Engine
 
-          if (rack_app = discover_rack_app(route.app)) && rack_app.respond_to?(:routes)
+          rack_app = discover_rack_app(route.app)
+
+          if rack_app && rack_app.respond_to?(:routes) && rack_app.routes.respond_to?(:routes)
             rack_app.routes.routes.each do |rack_route|
               self.routes << normalise_route(rack_route, route.path.spec)
-            end if rack_app.routes.respond_to?(:routes)
+            end
           end
 
           next if route.verb.source.empty?