diff --git a/colloscope/models.py b/colloscope/models.py
index fb93ddc..08925c2 100644
--- a/colloscope/models.py
+++ b/colloscope/models.py
@@ -1,11 +1,12 @@
 from datetime import date, datetime, timedelta
+from pprint import pprint
 
 from pytz import timezone
 
 import aiohttp
 
 from django.db import models
-from django.db.models import F, Q, Count, QuerySet
+from django.db.models import F, Q, Count, QuerySet, Subquery, OuterRef, Sum
 from django.contrib.auth.models import User
 from django.conf import settings
 
@@ -144,25 +145,35 @@ class Term(models.Model):
                 .select_related("slot", "slot__term")
                 .prefetch_related("swap_set")
                 .filter(slot__term=self)
-                .annotate(adt_plus=Count("swap", filter=Q(swap__enroll=1)))
-                .annotate(adt_minus=Count("swap", filter=Q(swap__enroll=0)))
-                .annotate(volume=F("slot__capacity") + F("adt_plus") - F("adt_minus")))
+                .annotate(base_vol=Count("groups__members"))
+                .annotate(swap_plus=Count("swap", filter=Q(swap__enroll=1), distinct=True))
+                .annotate(swap_minus=Count("swap", filter=Q(swap__enroll=0), distinct=True))
+                .annotate(volume=F("base_vol") + F("swap_plus") - F("swap_minus")))
 
     def query_colles_of_student(self, student) -> QuerySet:
+        has_student = ((Q(groups__student=student)
+                        & ~Q(swap__enroll=0, swap__student=student))
+                       | Q(swap__enroll=1, swap__student=student))
+
         return (Colle.objects
                 .select_related("slot", "slot__term")
                 .prefetch_related("swap_set")
                 .filter(slot__term=self)
-                .filter((Q(groups__student=student)
-                         & ~Q(swap__enroll=0, swap__student=student))
-                        | Q(swap__enroll=1, swap__student=student))
-                .annotate(adt_plus=Count("swap", filter=Q(swap__enroll=1)))
-                .annotate(adt_minus=Count("swap", filter=Q(swap__enroll=0)))
-                .annotate(volume=F("slot__capacity") + F("adt_plus") - F("adt_minus")))
+                .annotate(base_vol=Count("groups__members", distinct=True))
+                .annotate(swap_plus=Count("pk", filter=Q(swap__enroll=1), distinct=True))
+                .annotate(swap_minus=Count("pk", filter=Q(swap__enroll=0), distinct=True))
+                .annotate(volume=F("base_vol") + F("swap_plus") - F("swap_minus"))
+                .filter(has_student)
+                )
+
+    def query_colles_not_full_excluding_student(self, student) -> QuerySet:
+        has_student = ((Q(groups__student=student)
+                        & ~Q(swap__enroll=0, swap__student=student))
+                       | Q(swap__enroll=1, swap__student=student))
 
-    def query_colles_not_full(self) -> QuerySet:
         return (self.query_colles()
-                .filter(volume__lt=F("slot__capacity"), date__gte=date.today()))
+                .filter(volume__lt=F("slot__capacity"), date__gte=date.today())
+                .exclude(has_student))
 
     def __str__(self) -> str:
         return self.description
@@ -295,7 +306,7 @@ class Colle(models.Model):
                     "slot__time"]
 
     slot = models.ForeignKey(Slot, on_delete=models.CASCADE)
-    groups = models.ManyToManyField(Group)
+    groups = models.ManyToManyField(Group, blank=True)
     date = models.DateField()
 
     def initial_group(self):
@@ -319,23 +330,22 @@ class Colle(models.Model):
     def is_attendee(self, student):
         return self.final_group().contains(student)
 
-
-    def volume(self):
+    def get_volume(self):
         """
         Renvoie le nombre d'étudiants inscrits à la colle en tenant compte des swaps.
         """
-        n_base = sum(group.members.count() for group in self.groups.all())
-        n_plus = len(Swap.objects.filter(enroll=True, colle=self))
-        n_moins = len(Swap.objects.filter(enroll=False, colle=self))
-
-        return n_base + n_plus - n_moins
+        return (Student.objects
+                .filter(Q(groups__colle=self)
+                        & ~Q(swap__colle=self, swap__enroll=False)
+                        | Q(swap__colle=self, swap__enroll=True))
+                .distinct()
+                .count())
 
     def is_full(self):
         """
         Renvoie si la colle est pleine.
         """
-        eff = self.volume()
-        return eff >= self.slot.capacity
+        return self.get_volume() >= self.slot.capacity
 
     def is_edited(self):
         """
@@ -369,7 +379,7 @@ class Colle(models.Model):
             #    func()
 
     def __str__(self):
-        return f"{self.slot} le {self.date} avec groupes {'+'.join(str(groupe) for groupe in self.groups.all())}"
+        return f"Colle {self.slot.subject} ({self.slot.colleur}); {self.date} {self.slot.time} {self.slot.room}. Groupe(s) {{{'; '.join(str(groupe) for groupe in self.groups.all())}}}"
 
     def datetime(self):
         return datetime.combine(self.date, self.slot.time, tzinfo=timezone("Europe/Paris"))
@@ -425,3 +435,13 @@ class CalendarLink(models.Model):
                 fields=['student', 'term'], name='unique_student_term_combination'
             )
         ]
+
+
+
+def test():
+    valentin = Student.objects.get(pk=25)
+    term = Term.objects.get(pk=3)
+    colles = term.query_colles_of_student(valentin).order_by("-volume")
+
+    for c in colles:
+        print(f"* {c.slot} {c.volume} : {c.base_vol} + {c.swap_plus} - {c.swap_minus}")
\ No newline at end of file
diff --git a/colloscope/views.py b/colloscope/views.py
index f74ad3f..e12aadb 100644
--- a/colloscope/views.py
+++ b/colloscope/views.py
@@ -131,7 +131,7 @@ def marketplace(request):
         return HttpResponse("pas encore supporté")
 
     term = student.cls.current_term()
-    colles = term.query_colles_not_full()
+    colles = term.query_colles_not_full_excluding_student(student)
 
     context = {
         "colles": colles,
diff --git a/kholles_web/settings.py b/kholles_web/settings.py
index 9bc1f90..33603d5 100644
--- a/kholles_web/settings.py
+++ b/kholles_web/settings.py
@@ -80,7 +80,7 @@ TEMPLATES = [
 ]
 
 ASGI_APPLICATION = "kholles_web.asgi.application"
-#WSGI_APPLICATION = 'kholles_web.wsgi.application'
+WSGI_APPLICATION = 'kholles_web.wsgi.application'
 
 # Database
 # https://docs.djangoproject.com/en/5.0/ref/settings/#databases