rails重定向或使用特定动词渲染

def create
    @asset = Asset.new(params[:asset])
    @assets = Asset.all
    respond_to do |format|
      if @asset.save
        format.html { render :action => \'index\' } ##########
        format.xml  { render :xml => @asset, :status => :created, :location => @asset }
      else
        format.html { render :action => \"new\" }
        format.xml  { render :xml => @asset.errors, :status => :unprocessable_entity }
      end
    end
  end

  format.html { redirect_to(assets_url) }

POST