code_reload

lib/rails_admin/config.rb

@@ -304,6 +304,14 @@ def reset_model(model)
         @registry.delete(key)
       end
 
+      # Reset all models configuration
+      # Used to clear all configurations when reloading code in development.
+      # @see RailsAdmin::Engine
+      # @see RailsAdmin::Config.registry
+      def reset_all_models
+        @registry = {}
+      end
+
       # Get all models that are configured as visible sorted by their weight and label.
       #
       # @see RailsAdmin::Config::Hideable

lib/rails_admin/engine.rb

@@ -32,6 +32,18 @@ class Engine < Rails::Engine
       app.config.middleware.use Rack::Pjax
     end
 
+    initializer 'RailsAdmin reload config in development' do
+      if Rails.application.config.cache_classes
+        if defined?(ActiveSupport::Reloader)
+          ActiveSupport::Reloader.before_class_unload do
+            RailsAdmin::Config.reset_all_models
+          end
+          # else
+          # For Rails 4 not implemented
+        end
+      end
+    end
+
     rake_tasks do
       Dir[File.join(File.dirname(__FILE__), '../tasks/*.rake')].each { |f| load f }
     end

spec/rails_admin/config_spec.rb

@@ -344,6 +344,12 @@ class RecursivelyEmbedsMany
       end
     end
 
+    let(:team_config3) do
+      proc do
+        field :wins
+      end
+    end
+
     it "allows code reloading" do
       Team.send(:rails_admin, &team_config)
 
@@ -364,6 +370,34 @@ class Toggle < RailsAdmin::Config::Fields::Base
       Team.send(:rails_admin, &team_config2)
       expect(fields.map(&:name)).to match_array %i(id wins)
     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)
+
+        # restore setting to previous value
+        Rails.application.config.cache_classes = true
+        # else
+        # pending "for Rails 4 not implemented"
+      end
+    end
   end
 end