Better usage of cache for groups and clubs related operations (#634)

* Better usage of cache for group retrieval

* Cache clearing on object deletion or update

* replace signals by save and delete override

* add is_anonymous check in is_owned_by

Add in many is_owned_by(self, user) methods that user is not anonymous. Since many of those functions do db queries, this should reduce a little bit the load of the db.

* Stricter usage of User.is_in_group

Constrain the parameters that can be passed to the function to make sure only a str or an int can be used. Also force to explicitly specify if the group id or the group name is used.

* write test and correct bugs

* remove forgotten populate commands

* Correct test

counter/models.py

@@ -228,7 +228,9 @@ class ProductType(models.Model):
         """
         Method to see if that object can be edited by the given user
         """
-        if user.is_in_group(settings.SITH_GROUP_ACCOUNTING_ADMIN_ID):
+        if user.is_anonymous:
+            return False
+        if user.is_in_group(pk=settings.SITH_GROUP_ACCOUNTING_ADMIN_ID):
             return True
         return False
 
@@ -294,9 +296,11 @@ class Product(models.Model):
         """
         Method to see if that object can be edited by the given user
         """
+        if user.is_anonymous:
+            return False
         if user.is_in_group(
-            settings.SITH_GROUP_ACCOUNTING_ADMIN_ID
-        ) or user.is_in_group(settings.SITH_GROUP_COUNTER_ADMIN_ID):
+            pk=settings.SITH_GROUP_ACCOUNTING_ADMIN_ID
+        ) or user.is_in_group(pk=settings.SITH_GROUP_COUNTER_ADMIN_ID):
             return True
         return False
 
@@ -318,8 +322,8 @@ class Product(models.Model):
         """
         if not self.buying_groups.exists():
             return True
-        for group in self.buying_groups.all():
-            if user.is_in_group(group.name):
+        for group_id in self.buying_groups.values_list("pk", flat=True):
+            if user.is_in_group(pk=group_id):
                 return True
         return False
 
@@ -402,18 +406,17 @@ class Counter(models.Model):
         return reverse("counter:details", kwargs={"counter_id": self.id})
 
     def is_owned_by(self, user):
+        if user.is_anonymous:
+            return False
         mem = self.club.get_membership_for(user)
         if mem and mem.role >= 7:
             return True
-        return user.is_in_group(settings.SITH_GROUP_COUNTER_ADMIN_ID)
+        return user.is_in_group(pk=settings.SITH_GROUP_COUNTER_ADMIN_ID)
 
     def can_be_viewed_by(self, user):
         if self.type == "BAR":
             return True
-        return (
-            user.is_in_group(settings.SITH_MAIN_BOARD_GROUP)
-            or user in self.sellers.all()
-        )
+        return user.is_board_member or user in self.sellers.all()
 
     def gen_token(self):
         """Generate a new token for this counter"""
@@ -621,6 +624,8 @@ class Refilling(models.Model):
         )
 
     def is_owned_by(self, user):
+        if user.is_anonymous:
+            return False
         return user.is_owner(self.counter) and self.payment_method != "CARD"
 
     def delete(self, *args, **kwargs):
@@ -713,6 +718,8 @@ class Selling(models.Model):
         )
 
     def is_owned_by(self, user):
+        if user.is_anonymous:
+            return False
         return user.is_owner(self.counter) and self.payment_method != "CARD"
 
     def can_be_viewed_by(self, user):
@@ -953,7 +960,9 @@ class CashRegisterSummary(models.Model):
         """
         Method to see if that object can be edited by the given user
         """
-        if user.is_in_group(settings.SITH_GROUP_COUNTER_ADMIN_ID):
+        if user.is_anonymous:
+            return False
+        if user.is_in_group(pk=settings.SITH_GROUP_COUNTER_ADMIN_ID):
             return True
         return False
 
@@ -1022,7 +1031,9 @@ class Eticket(models.Model):
         """
         Method to see if that object can be edited by the given user
         """
-        return user.is_in_group(settings.SITH_GROUP_COUNTER_ADMIN_ID)
+        if user.is_anonymous:
+            return False
+        return user.is_in_group(pk=settings.SITH_GROUP_COUNTER_ADMIN_ID)
 
     def get_hash(self, string):
         import hashlib