diff --git a/collabs/admin.py b/collabs/admin.py
index 82a83a2..b0d90f9 100644
--- a/collabs/admin.py
+++ b/collabs/admin.py
@@ -35,9 +35,9 @@ class Collabs_hour_Admin(admin.ModelAdmin):
     class Meta:
         verbose_name = 'Heure supplémentaire'
         verbose_name_plural = 'Heures supplémentaires'
-    list_display = ('dtDate', 'nHour', 'nMinutes', 'user', 'sBases', 'type', 'get_total_hour_by_user', 'has_remarques', 'bNoticed')
+    list_display = ('dtDate', 'nHour', 'nMinutes', 'sTargetUser', 'sBases', 'type', 'get_total_hour_by_user', 'has_remarques', 'bNoticed')
 
-    list_filter = [('dtDate', DateRangeFilter), ('user', admin.RelatedOnlyFieldListFilter),'sBases','type', 'bNoticed']
+    list_filter = [('dtDate', DateRangeFilter), 'sTargetUser','sBases','type', 'bNoticed']
 
     search_fields = ['userName']
     readonly_fields = ["userName"]
diff --git a/collabs/models.py b/collabs/models.py
index 849e3d4..8eec7f5 100644
--- a/collabs/models.py
+++ b/collabs/models.py
@@ -7,6 +7,9 @@ from django.conf import settings
 from django.utils import timezone
 from django.contrib import admin
 
+from django.dispatch import receiver
+from django.db.models.signals import pre_save
+
 #test
 
 BASES_CHOICES = [
@@ -33,7 +36,8 @@ class Collabs_hour(models.Model):
 
 
     userName = models.CharField("Auteur", max_length=100)
-    user = models.ForeignKey(settings.AUTH_USER_MODEL, limit_choices_to={'groups__name': "Intervenants"}, verbose_name="Collaborateur", on_delete=models.DO_NOTHING)
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, limit_choices_to={'groups__name': "Intervenants"}, verbose_name="Collaborateur", on_delete=models.SET_NULL, null=True)
+    sTargetUser = models.CharField("Collaborateur", blank=True, max_length=150, null=True, default="")
     nHour = models.PositiveIntegerField("Heures", default=0, validators=[MinValueValidator(0), MaxValueValidator(23)])
     nMinutes = models.PositiveIntegerField("Minutes", default=0, validators=[MinValueValidator(0), MaxValueValidator(60)])
     sRemarques = models.TextField("Remarques", blank=True)
@@ -86,7 +90,7 @@ class Collabs_hour(models.Model):
             ret = True
         return ret
     def __str__(self):
-        return f"Heure supplémentaire: {self.user} : {self.dtCreated.strftime('%d.%m.%Y')} "
+        return f"Heure supplémentaire: {self.sTargetUser} : {self.dtCreated.strftime('%d.%m.%Y')} "
 
     class Meta:
         verbose_name = "heure supplémentaire"
@@ -95,3 +99,18 @@ class Collabs_hour(models.Model):
             ("can_notice", "Peut noter comme traitée"),
 
         )
+
+
+all = Collabs_hour.objects.all()
+for item in all:
+    print(item)
+    item.sTargetUser = "testDEV"
+    if item.user is not None:
+        item.sTargetUser = f"{item.user.first_name} {item.user.last_name}"
+    item.save()
+
+
+@receiver(pre_save, sender=Collabs_hour)
+def on_update(instance,**kwargs):
+    if instance.user is not None:
+        instance.sTargetUser = f"{instance.user.first_name} {instance.user.last_name}"
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