add option to sort by number of annotations per layer

pandora/config.indiancinema.jsonc

@@ -578,6 +578,14 @@
             "sort": true,
             "value": {"layer": "subtitles", "type": "wordsperminute"}
         },
+        {
+            "id": "numberofnotes",
+            "title": "Number of Notes",
+            "type": "integer",
+            "columnWidth": 60,
+            "sort": true,
+            "value": {"layer": "notes", "type": "length"}
+        },
         {
             "id": "numberofdocuments",
             "title": "Number of Documents",

pandora/item/models.py

@@ -999,7 +999,10 @@ class Item(models.Model):
                     set_value(s, name, value)
                 elif sort_type in ('length', 'integer', 'time', 'float'):
                     #can be length of strings or length of arrays, i.e. keywords
-                    value = self.get(source)
+                    if 'layer' in key.get('value', []):
+                        value = self.annotations.filter(layer=key['value']['layer']).count()
+                    else:
+                        value = self.get(source)
                     if isinstance(value, list):
                         value = len(value)
                     set_value(s, name, value)