add field to shift reg to ensure extra shift done is increment only once

lacagette_addons/lacagette_membership/models/shift_registration.py

@@ -19,6 +19,9 @@ class ShiftRegistration(models.Model):
         "Who will do the shift, partner, associate or both",
         default= False)
     
+    should_increment_extra_shift_done = fields.Boolean(
+        "Set to True when partners are both present. Used to detect if extra_shift_done is to be incremented when recording presences",
+        default= False)
 
 
     @api.multi