TMSS-320: added property filepath to Dataproduct

SAS/TMSS/src/tmss/tmssapp/models/scheduling.py

@@ -334,6 +334,10 @@ class Dataproduct(BasicCommon):
 
         super().save(force_insert, force_update, using, update_fields)
 
+    @property
+    def filepath(self):
+        '''return the full path of the dataproduct'''
+        return os.path.join(self.directory, self.filename)
 
 class AntennaSet(NamedCommon):
     station_type = ForeignKey('StationType', null=False, on_delete=PROTECT)