--- basecompiler.py	2016-07-19 11:35:36.204901300 -0700
+++ basecompiler-patched.py	2016-07-19 11:31:30.484901300 -0700
@@ -229,9 +229,12 @@
         # is the parent's primary key, while the field the filter
         # should consider is the child's foreign key field.
         if column != field.column:
-            if not field.primary_key:
-                raise DatabaseError("This database doesn't support filtering "
-                                    "on non-primary key ForeignKey fields.")
+            #Removed this conditional in Patch-1.8.mcdspatch as it is unnecessary in mongodb
+            #while no explicit support for filtering on non-primary key FKs
+            # exists, mongo will continue as expected without errors.
+            #if not field.primary_key:
+            #    raise DatabaseError("This database doesn't support filtering "
+            #                        "on non-primary key ForeignKey fields.")
 
             field = (f for f in opts.fields if f.column == column).next()
             assert field.rel is not None