Views field view allows you to pass an argument to a view and return results.
For the video inclined here’s the 2 minute feed http://www.youtube.com/watch?v=dUoL_ARPLcI
Use Case: we’ve got a lot of variables being tallied in different views. Views in general seems an awkward tool for tabulating values. Tools like views calc and group by work ok for getting a sum or count here and there, but try mixing several together in one view and the errors start to fly. May just be I don’t have my head around them, in any case they are not intuitive. For a given organic group node I need to know how many posts there are total (not a problem, that field comes with organic group views integration), and how many of these posts have been completed in a certain way.
Creating this separate view is simple, but now I want to link the main view to the small view tally. Views Field View let’s you pick a view and pass it an argument to filter the results per row. In this case we load a node id into our main view and pass the argument over to the Views Field View – creating a new field with the correct info on a per row basis = Nice!
The only thing that doesn’t work is that it does not actually load this view in the order the rows are listed. Because of this it does not work well with Views PHP. Although the rows are listed in this global php field the actual data is not available because for some reason the field is not loaded in the order one might imagine it to be. It’d be really handy to be able to use these variables in calculations, however it’s just not obvious at all how to do that.