#101 Team sharing tests

* adds tests for team sharing
* extends the API for team sharing support
* adds shared_teams property shortcut for ShareableObjectMixin
* adds full support for team-based sharing to all views and functions
* simplifies ShareModalForm
* adds/updates translations

konova/models/object.py

@@ -501,30 +501,37 @@ class ShareableObjectMixin(models.Model):
         form_data = form.cleaned_data
 
         # Fetch selected teams and find out which user IDs are in removed teams -> mails need to be sent
-        accessing_teams = form_data["team_select"]
+        accessing_teams = form_data["teams"]
         removed_team_users = self.teams.all().exclude(
             id__in=accessing_teams
         ).values_list("users__id", flat=True)
-
-        new_accessing_users = list(form_data["user_select"].values_list("id", flat=True))
-        keep_accessing_users = form_data["users"]
-        accessing_users = keep_accessing_users + new_accessing_users
-        users = User.objects.filter(
-            id__in=accessing_users
+        accessing_team_users = User.objects.filter(
+            id__in=accessing_teams.values_list("users", flat=True)
         )
+        new_team_users = accessing_team_users.exclude(
+            id__in=self.shared_users
+        ).values_list("id", flat=True)
+
+        # Fetch selected users
+        accessing_users = form_data["users"]
         removed_users = self.users.all().exclude(
             id__in=accessing_users
         ).values_list("id", flat=True)
+        new_users = accessing_users.exclude(
+            id__in=self.shared_users
+        ).values_list("id", flat=True)
+
+        new_users = new_users.union(new_team_users)
         removed_users = removed_users.union(removed_team_users)
 
         # Send mails
         for user_id in removed_users:
             celery_send_mail_shared_access_removed.delay(self.identifier, self.title, user_id)
-        for user_id in new_accessing_users:
+        for user_id in new_users:
             celery_send_mail_shared_access_given.delay(self.identifier, self.title,  user_id)
 
         # Set new shared users
-        self.share_with_user_list(users)
+        self.share_with_user_list(accessing_users)
         self.share_with_team_list(accessing_teams)
 
     @property
@@ -536,6 +543,15 @@ class ShareableObjectMixin(models.Model):
         """
         return self.users.all()
 
+    @property
+    def shared_teams(self) -> QuerySet:
+        """ Shortcut for fetching the teams which have shared access on this object
+
+        Returns:
+            teams (QuerySet)
+        """
+        return self.teams.all()
+
     @abstractmethod
     def get_share_url(self):
         """ Returns the share url for the object