How to create a CouchDB View to join documents based on multiple, non-unique fields

How to create a CouchDB View to join documents based on multiple,
non-unique fields

I have a database with documents in the following forms:
{"Type" : "A", "Date": "2013-09-19", "Week" : "A", "Day" : "Mon"}
{"Type" : "B", "Week" : "A", "Day" : "Mon", "Class" : "xyz"}
How do I create a view that will list all the classes (from doc.Type =
"B") for a specific date (from doc.Type = "A")? Essentially it means
matching the "Week" and "Day" fields. I have found examples (mostly based
on Christopher Lenz's solution) but these are matching based on just one
field being matched, which is unique in one of the document types.