WIP: Modify Group#deletable? for soft deleted projects

projectsが全て論理削除されていた場合もdeletable?が真を返すようにした

app/controllers/groups_controller.rb

@@ -42,12 +42,12 @@ def destroy
       return
     end
 
-    projects = @group.projects.where(is_deleted: false)
-    projects.each { |p| p.update!(is_deleted: true) }
-    @group.destroy!
-    redirect_to :groups
-  rescue ActiveRecord::RecordNotSaved, ActiveRecord::RecordNotDestroyed
-    redirect_to [:edit, @group], alert: 'Group was not deleted.'
+    # TODO: soft delete
+    if @group.destroy
+      redirect_to :groups
+    else
+      redirect_to [:edit, @group], alert: 'Group was not deleted.'
+    end
   end
 
   private

app/models/group.rb

@@ -47,7 +47,7 @@ def generate_draft
   end
 
   def deletable?
-    projects.none?
+    projects.none? || projects.pluck(:is_deleted).all?
   end
 
   private

spec/models/group_spec.rb

@@ -42,5 +42,11 @@
 
       it { is_expected.to eq false }
     end
+
+    context 'when projects are all deleted' do
+      before { FactoryBot.create_list(:project, 2, owner: group, is_deleted: true) }
+
+      it { is_expected.to eq true }
+    end
   end
 end