In a view, how can I display all sub categories of a given taxonomy term with content from each sub category? For each article, I assign a 'sub-category' taxonomy vocabulary term.  Then for each 'sub-category' taxonomy term, it links to a 'category' taxonomy vocabulary term.  

I have set up a variant of the taxonomy-term template page that passes the category ID as an argument to a view.  This view then uses a contextual filter to display all content within all sub-categories for the given category ID.  

To illustrate, say you type in sitename.com/taxonomy/term/1922 which is, say, movies.  The view will display all content marked with movies' sub categories.  So it currently would show this:


/taxonomy/term/1922 (Movies)  
Title         |      Sub-Category |
——————————————————————————————————-  
Star Wars     |            Sci-Fi |  
Star Trek II  |            Sci-Fi |  
Home Alone    |            Comedy |  
Office Space  |            Comedy |  
Thin Red Line |               War |  


What I want is to have, say, 5 pieces of content per sub-category titled by the sub-category.  Something like this:

/taxonomy/term/1922 (Movies)


Scifi:


Star Wars
Star Trek II
...
...
...

Comedy:


OFfice Space
Home ALone
...
...
...



And so forth.  So that it would title all sub-categories and show the top x number of nodes per sub-category.
This isn't a great answer, but after a couple days of trying to do this myself, the best I could figure out was to use Views Field View (I think that Views Grouping Row Limit would probably work too, but it's still in dev).

Create a basic node view that lists off your five movie node titles (along with any other teaser-like content you'd like), set your page to limit to five entries, and set the contextual filter to the movie's taxonomy term.

Then, make a view that shows taxonomies belonging to the vocabulary (movies). Set the contextual filter to "taxonomy term: parent term"), and output the tid (hidden) and term title. That'll make a list of your parent terms, so now add a views_field_view (set it to use your first view for input, and the tid for your argument).

Again, there's got to be a better way than this, as I'm sure it's going to create some real system overhead.

Pleeeease, someone come up with a better answer!