Make sure to restore original value

Refs. #3041

CHANGELOG.md

@@ -11,6 +11,7 @@
 - Support for jquery-ui-rails 6.x([#2951](https://github.com/sferik/rails_admin/issues/2951), [#3003](https://github.com/sferik/rails_admin/issues/3003))
 
 ### Fixed
+- Make code reloading work([#3041](https://github.com/sferik/rails_admin/pull/3041))
 - Improved support for Rails API mode, requiring needed middlewares in engine's initializer([#2919](https://github.com/sferik/rails_admin/issues/2919), [#3006](https://github.com/sferik/rails_admin/pull/3006))
 - Make the link text to uploaded file shorter, instead of showing full url([#2983](https://github.com/sferik/rails_admin/pull/2983))
 - Fix duplication of filters on browser back([#2998](https://github.com/sferik/rails_admin/pull/2998))

spec/rails_admin/config_spec.rb

@@ -329,6 +329,9 @@ class RecursivelyEmbedsMany
   end
 
   describe "field types code reloading" do
+    before { Rails.application.config.cache_classes = false }
+    after { Rails.application.config.cache_classes = true }
+
     let(:config) { described_class.model(Team) }
     let(:fields) { described_class.model(Team).edit.fields }
 
@@ -338,6 +341,7 @@ class RecursivelyEmbedsMany
         field :wins, :boolean
       end
     end
+
     let(:team_config2) do
       proc do
         field :wins, :toggle
@@ -372,32 +376,19 @@ class Toggle < RailsAdmin::Config::Fields::Base
     end
 
     it "updates model config when reloading code for rails 5" do
-      if defined?(ActiveSupport::Reloader)
-        Team.send(:rails_admin, &team_config)
-
-        # this simulates rails code reloading
-        Rails.application.config.cache_classes = false
-        RailsAdmin::Engine.initializers.select do |i|
-          i.name == "RailsAdmin reload config in development"
-        end.first.block.call
-        if defined?(ActiveSupport::Reloader)
-          Rails.application.executor.wrap do
-            ActiveSupport::Reloader.new.tap(&:class_unload!).complete!
-          end
-          # else
-          # for Rails 4 not imlemented yet
-        end
-        # /end
-
-        Team.send(:rails_admin, &team_config3)
-        expect(fields.map(&:name)).to match_array %i(wins)
+      Team.send(:rails_admin, &team_config)
 
-        # restore setting to previous value
-        Rails.application.config.cache_classes = true
-        # else
-        # pending "for Rails 4 not implemented"
+      # this simulates rails code reloading
+      RailsAdmin::Engine.initializers.select do |i|
+        i.name == "RailsAdmin reload config in development"
+      end.first.block.call
+      Rails.application.executor.wrap do
+        ActiveSupport::Reloader.new.tap(&:class_unload!).complete!
       end
-    end
+
+      Team.send(:rails_admin, &team_config3)
+      expect(fields.map(&:name)).to match_array %i(wins)
+    end if defined?(ActiveSupport::Reloader)
   end
 end