Fixes EcoAccount availability ordering

* adds db based table ordering for EcoAccountTable

compensation/models/eco_account.py

@@ -35,6 +35,12 @@ class EcoAccount(AbstractCompensation, ShareableObjectMixin, RecordableObjectMix
         help_text="Amount of deductable surface - can be lower than the total surface due to deduction limitations",
         default=0,
     )
+    deductable_rest = models.FloatField(
+        blank=True,
+        null=True,
+        help_text="Amount of deductable rest",
+        default=0,
+    )
 
     legal = models.OneToOneField(
         "intervention.Legal",
@@ -100,28 +106,22 @@ class EcoAccount(AbstractCompensation, ShareableObjectMixin, RecordableObjectMix
         """
         return self.after_states.all().aggregate(Sum("surface"))["surface__sum"] or 0
 
-    def get_available_rest(self) -> (float, float):
+    def __calculate_deductable_rest(self):
         """ Calculates available rest surface of the eco account
 
         Args:
 
         Returns:
             ret_val_total (float): Total amount
-            ret_val_relative (float): Amount as percentage (0-100)
         """
         deductions = self.deductions.filter(
             intervention__deleted=None,
         )
         deductions_surfaces = deductions.aggregate(Sum("surface"))["surface__sum"] or 0
         available_surfaces = self.deductable_surface or deductions_surfaces ## no division by zero
-        ret_val_total = available_surfaces - deductions_surfaces
+        ret_val = available_surfaces - deductions_surfaces
 
-        if available_surfaces > 0:
-            ret_val_relative = int((ret_val_total / available_surfaces) * 100)
-        else:
-            ret_val_relative = 0
-
-        return ret_val_total, ret_val_relative
+        return ret_val
 
     def quality_check(self) -> EcoAccountQualityChecker:
         """ Quality check
@@ -181,6 +181,29 @@ class EcoAccount(AbstractCompensation, ShareableObjectMixin, RecordableObjectMix
         for team_id in shared_teams:
             celery_send_mail_deduction_changed_team.delay(self.identifier, self.title, team_id, data_change)
 
+    def update_deductable_rest(self):
+        """
+        Updates deductable_rest, which holds the amount of rest surface for this account.
+
+        Returns:
+
+        """
+        self.deductable_rest = self.__calculate_deductable_rest()
+        self.save()
+
+    def get_deductable_rest_relative(self):
+        """
+        Returns deductable_rest relative to deductable_surface mapped to [0,100]
+
+        Returns:
+
+        """
+        try:
+            ret_val = int((self.deductable_rest / (self.deductable_surface or 0)) * 100)
+        except ZeroDivisionError:
+            ret_val = 0
+        return ret_val
+
 
 class EcoAccountDocument(AbstractDocument):
     """
@@ -272,3 +295,8 @@ class EcoAccountDeduction(BaseResource):
             self.intervention.mark_as_edited(user, edit_comment=DEDUCTION_REMOVED)
             self.account.mark_as_edited(user, edit_comment=DEDUCTION_REMOVED)
         super().delete(*args, **kwargs)
+        self.account.update_deductable_rest()
+
+    def save(self, *args, **kwargs):
+        super().save(*args, **kwargs)
+        self.account.update_deductable_rest()