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

@@ -28,6 +28,14 @@ class Engine < Rails::Engine
       app.config.middleware.use Rack::Pjax
     end
 
+    initializer 'RailsAdmin reload config in development' do
+      unless Rails.application.config.cache_classes
+        ActiveSupport::Reloader.before_class_unload do |cl|
+          RailsAdmin::Config.reset_all_models
+        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 +370,26 @@ 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" do
+      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
+      ActiveSupport::Reloader.new.tap do |instance|
+        instance.class_unload!
+      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
+    end
   end
 end