```ruby
class AppsController < ApplicationController
  resource_controller
  
  index.before { @app = App.new }
  index.wants.atom
  
  show.wants.html do
    if request.xhr?
      render :partial => 'app', :locals => {:app => @app}
    end
  end
  
  create.wants.html do
    redirect_to app_activities_path(@app)
  end
    
  edit.wants.html do
    if request.xhr?
      render :partial => 'edit_name', :locals => {:app => @app}
    end
  end
  
  update.wants.html do
    if request.xhr?
      render :partial => 'app', :locals => {:app => @app}
    else
      redirect_to app_activities_path(@app)
    end
  end
  
  private
  
  def add_controller_crumbs
    add_crumb 'Apps', apps_path
    
    if object
      add_crumb object.to_s, app_path(object)
    end
  end
end
```

Return a partial error form when there is an failure in the partial app form.
user
```ruby
class AppsController < ApplicationController
  resource_controller

  index.before { @app = App.new }
  index.wants.atom

  show.wants.html do
    if request.xhr?
      render :partial => 'app', :locals => {:app => @app}
    end
  end

  create.wants.html do
    redirect_to app_activities_path(@app)
  end

  edit.wants.html do
    if request.xhr?
      render :partial => 'edit_name', :locals => {:app => @app}
    end
  end

  update.success.wants.html do
    if request.xhr?
      render :partial => 'app', :locals => {:app => @app}
    else
      redirect_to app_activities_path(@app)
    end
  end
  update.failure.wants.html do
    if request.xhr?
      render :partial => 'edit_name', :locals => {:app => @app}
    end
  end

  private

  def add_controller_crumbs
    add_crumb 'Apps', apps_path

    if object
      add_crumb object.to_s, app_path(object)
    end
  end
end
```
assistant