Rails Sunspot gem：使用多个模型站点范围搜索的Usings方面

I'm trying to implement a sitewide search through the powerful Sunspot gem for Rails. This involves a search across multiple, very different models at once. What I WANT to do is use the faceting feature to allow the user to filter their search results on each model, or by default view all on the same page, interspersed with each other ordered by the :boost qualifier. Combining the faceting code from the I'm trying to implement a sitewide search throu