Fix error on searching or sorting by ActiveStorage field

Fixes #3678

lib/rails_admin/config/fields/base.rb

@@ -67,7 +67,7 @@ def sort_column
             sortable
           elsif sortable.is_a?(Hash) # just join sortable hash, don't do anything smart
             "#{sortable.keys.first}.#{sortable.values.first}"
-          elsif association # use column on target table
+          elsif association? # use column on target table
             "#{associated_model_config.abstract_model.quoted_table_name}.#{abstract_model.quote_column_name(sortable)}"
           else # use described column in the field conf.
             "#{abstract_model.quoted_table_name}.#{abstract_model.quote_column_name(sortable)}"

lib/rails_admin/config/fields/types/active_storage.rb

@@ -40,6 +40,14 @@ class ActiveStorage < RailsAdmin::Config::Fields::Types::FileUpload
             )
           end
 
+          register_instance_option :searchable do
+            false
+          end
+
+          register_instance_option :sortable do
+            false
+          end
+
           def resource_url(thumb = false)
             return nil unless value
 

lib/rails_admin/config/fields/types/multiple_active_storage.rb

@@ -70,6 +70,14 @@ def resource_url(thumb = false)
               direct? && {data: {direct_upload_url: bindings[:view].main_app.rails_direct_uploads_url}} || {},
             )
           end
+
+          register_instance_option :searchable do
+            false
+          end
+
+          register_instance_option :sortable do
+            false
+          end
         end
       end
     end

spec/controllers/rails_admin/main_controller_spec.rb

@@ -65,6 +65,26 @@ def get(action, params)
       end
     end
 
+    context 'with a virtual field' do
+      before do
+        RailsAdmin.config('Player') do
+          base do
+            field :virtual do
+              sortable :name
+            end
+          end
+
+          list do
+            sort_by :virtual
+          end
+        end
+      end
+
+      it 'returns the query referenced in the sortable' do
+        expect(controller.send(:get_sort_hash, RailsAdmin.config(Player))).to match(sort: /["`]?players["`]?\.["`]?name["`]?/, sort_reverse: true)
+      end
+    end
+
     it 'works with belongs_to associations with label method virtual' do
       controller.params = {sort: 'parent_category', model_name: 'categories'}
       expect(controller.send(:get_sort_hash, RailsAdmin.config(Category))).to eq(sort: 'categories.parent_category_id', sort_reverse: true)

spec/rails_admin/config/fields/types/active_storage_spec.rb

@@ -123,5 +123,17 @@
         end
       end
     end
+
+    describe '#searchable' do
+      it 'is false' do
+        expect(field.searchable).to be false
+      end
+    end
+
+    describe '#sortable' do
+      it 'is false' do
+        expect(field.sortable).to be false
+      end
+    end
   end
 end

spec/rails_admin/config/fields/types/multiple_active_storage_spec.rb

@@ -127,5 +127,17 @@
         end
       end
     end
+
+    describe '#searchable' do
+      it 'is false' do
+        expect(field.searchable).to be false
+      end
+    end
+
+    describe '#sortable' do
+      it 'is false' do
+        expect(field.sortable).to be false
+      end
+    end
   end
 end