feat: custom through model for Counter.sellers

counter/migrations/0038_countersellers.py

@@ -0,0 +1,73 @@
+# Generated by Django 5.2.11 on 2026-03-04 15:26
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("counter", "0037_productformula"),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        # cf. https://docs.djangoproject.com/fr/stable/howto/writing-migrations/#changing-a-manytomanyfield-to-use-a-through-model
+        migrations.SeparateDatabaseAndState(
+            database_operations=[
+                migrations.RunSQL(
+                    sql="ALTER TABLE counter_counter_sellers RENAME TO counter_countersellers",
+                    reverse_sql="ALTER TABLE counter_countersellers RENAME TO counter_counter_sellers",
+                ),
+            ],
+            state_operations=[
+                migrations.CreateModel(
+                    name="CounterSellers",
+                    fields=[
+                        (
+                            "id",
+                            models.AutoField(
+                                auto_created=True,
+                                primary_key=True,
+                                serialize=False,
+                                verbose_name="ID",
+                            ),
+                        ),
+                        (
+                            "counter",
+                            models.ForeignKey(
+                                on_delete=django.db.models.deletion.CASCADE,
+                                to="counter.counter",
+                            ),
+                        ),
+                        (
+                            "user",
+                            models.ForeignKey(
+                                on_delete=django.db.models.deletion.CASCADE,
+                                to=settings.AUTH_USER_MODEL,
+                            ),
+                        ),
+                    ],
+                    options={
+                        "constraints": [
+                            models.UniqueConstraint(
+                                fields=("counter", "user"),
+                                name="counter_counter_sellers_counter_id_subscriber_id_key",
+                            )
+                        ],
+                    },
+                ),
+                migrations.AlterField(
+                    model_name="counter",
+                    name="sellers",
+                    field=models.ManyToManyField(
+                        blank=True,
+                        related_name="counters",
+                        through="counter.CounterSellers",
+                        to=settings.AUTH_USER_MODEL,
+                        verbose_name="sellers",
+                    ),
+                ),
+            ],
+        )
+    ]

counter/models.py

@@ -551,7 +551,11 @@ class Counter(models.Model):
         choices=[("BAR", _("Bar")), ("OFFICE", _("Office")), ("EBOUTIC", _("Eboutic"))],
     )
     sellers = models.ManyToManyField(
-        User, verbose_name=_("sellers"), related_name="counters", blank=True
+        User,
+        verbose_name=_("sellers"),
+        related_name="counters",
+        blank=True,
+        through="CounterSellers",
     )
     edit_groups = models.ManyToManyField(
         Group, related_name="editable_counters", blank=True
@@ -743,6 +747,23 @@ class Counter(models.Model):
         ]
 
 
+class CounterSellers(models.Model):
+    counter = models.ForeignKey(Counter, on_delete=models.CASCADE)
+    user = models.ForeignKey(User, on_delete=models.CASCADE)
+
+    class Meta:
+        verbose_name = _("counter seller")
+        constraints = [
+            models.UniqueConstraint(
+                fields=["counter", "user"],
+                name="counter_counter_sellers_counter_id_subscriber_id_key",
+            )
+        ]
+
+    def __str__(self):
+        return f"counter {self.counter_id} - user {self.user_id}"
+
+
 class RefillingQuerySet(models.QuerySet):
     def annotate_total(self) -> Self:
         """Annotate the Queryset with the total amount.