add a bgclass helper func

anki/cards.py

@@ -132,6 +132,10 @@ streak=?, lapses=?, grade=?, cycles=?, edue=? where id = ?""",
     def template(self):
         return self._reviewData()[1].templates[self.ord]
 
+    def bgClass(self):
+        return "cm%s-%s" % (hexifyID(self.model().id),
+                            hexifyID(self.template()['ord']))
+
     def startTimer(self):
         self.timerStarted = time.time()
 

anki/models.py

@@ -107,7 +107,7 @@ insert or replace into models values (?, ?, ?, ?, ?, ?, ?)""",
             return ""
         # fields
         css = "".join([self._fieldCSS(
-            ".fm%s.%s" % (hexifyID(self.id), hexifyID(f['ord'])),
+            ".fm%s-%s" % (hexifyID(self.id), hexifyID(f['ord'])),
             (f['font'], f['qsize'], f['qcol'], f['rtl'], f['pre']))
             for f in self.fields])
         # templates

tests/test_cards.py

@@ -85,3 +85,15 @@ def test_delete():
     assert deck.factCount() == 0
     assert deck.db.scalar("select count() from facts") == 0
     assert deck.db.scalar("select count() from cards") == 0
+
+def test_misc():
+    d = getEmptyDeck()
+    f = d.newFact()
+    f['Front'] = u'1'
+    f['Back'] = u'2'
+    d.addFact(f)
+    c = f.cards()[0]
+    assert c.bgClass() == "cm1-0"
+    assert c.fact().id == 1
+    assert c.model().id == 1
+    assert c.template()['ord'] == 0