Change deletion behaviour

Tous les `on_delete` étaient mis à PROTECT, ce qui faisait qu'on ne
pouvait rien supprimer... On les met à CASCADE pour tous les modèles
secondaires (`AccountNegative`, `CheckoutStatement`, `InventoryArticle`,
`SupplierArticle`, `Order` et `OrderArticle`) et pour les inventaires
créés à partir d'une commande.

Pour les modèles qui demandent une validation, et pour les `Operation`s,
on met à NULL le compte ou l'article associé (cela ne change pas le
total d'une opération, qui est la partie importante à garder).

kfet/migrations/0066_on_delete_actions.py

@@ -0,0 +1,133 @@
+# Generated by Django 2.2 on 2019-05-23 13:20
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [("kfet", "0065_choices_promo")]
+
+    operations = [
+        migrations.RemoveField(model_name="checkouttransfer", name="from_checkout"),
+        migrations.RemoveField(model_name="checkouttransfer", name="to_checkout"),
+        migrations.AlterField(
+            model_name="accountnegative",
+            name="account",
+            field=models.OneToOneField(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="negative",
+                to="kfet.Account",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="checkoutstatement",
+            name="checkout",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="statements",
+                to="kfet.Checkout",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="inventory",
+            name="order",
+            field=models.OneToOneField(
+                blank=True,
+                default=None,
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="inventory",
+                to="kfet.Order",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="inventoryarticle",
+            name="article",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE, to="kfet.Article"
+            ),
+        ),
+        migrations.AlterField(
+            model_name="inventoryarticle",
+            name="inventory",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE, to="kfet.Inventory"
+            ),
+        ),
+        migrations.AlterField(
+            model_name="operation",
+            name="article",
+            field=models.ForeignKey(
+                blank=True,
+                default=None,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                related_name="operations",
+                to="kfet.Article",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="operationgroup",
+            name="valid_by",
+            field=models.ForeignKey(
+                blank=True,
+                default=None,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                related_name="+",
+                to="kfet.Account",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="order",
+            name="supplier",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="orders",
+                to="kfet.Supplier",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="orderarticle",
+            name="article",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE, to="kfet.Article"
+            ),
+        ),
+        migrations.AlterField(
+            model_name="orderarticle",
+            name="order",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE, to="kfet.Order"
+            ),
+        ),
+        migrations.AlterField(
+            model_name="supplierarticle",
+            name="article",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE, to="kfet.Article"
+            ),
+        ),
+        migrations.AlterField(
+            model_name="supplierarticle",
+            name="supplier",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE, to="kfet.Supplier"
+            ),
+        ),
+        migrations.AlterField(
+            model_name="transfergroup",
+            name="valid_by",
+            field=models.ForeignKey(
+                blank=True,
+                default=None,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                related_name="+",
+                to="kfet.Account",
+            ),
+        ),
+        migrations.DeleteModel(name="ArticleRule"),
+        migrations.DeleteModel(name="CheckoutTransfer"),
+    ]

kfet/models.py

@@ -310,7 +310,7 @@ class AccountNegative(models.Model):
     objects = AccountNegativeManager()
 
     account = models.OneToOneField(
-        Account, on_delete=models.PROTECT, related_name="negative"
+        Account, on_delete=models.CASCADE, related_name="negative"
     )
     start = models.DateTimeField(blank=True, null=True, default=None)
     balance_offset = models.DecimalField(
@@ -387,7 +387,7 @@ class Checkout(models.Model):
 class CheckoutStatement(models.Model):
     by = models.ForeignKey(Account, on_delete=models.PROTECT, related_name="+")
     checkout = models.ForeignKey(
-        Checkout, on_delete=models.PROTECT, related_name="statements"
+        Checkout, on_delete=models.CASCADE, related_name="statements"
     )
     balance_old = models.DecimalField(
         "ancienne balance", max_digits=6, decimal_places=2
@@ -525,7 +525,7 @@ class Inventory(models.Model):
     # Optional
     order = models.OneToOneField(
         "Order",
-        on_delete=models.PROTECT,
+        on_delete=models.CASCADE,
         related_name="inventory",
         blank=True,
         null=True,
@@ -540,8 +540,8 @@ class Inventory(models.Model):
 
 
 class InventoryArticle(models.Model):
-    inventory = models.ForeignKey(Inventory, on_delete=models.PROTECT)
+    inventory = models.ForeignKey(Inventory, on_delete=models.CASCADE)
-    article = models.ForeignKey(Article, on_delete=models.PROTECT)
+    article = models.ForeignKey(Article, on_delete=models.CASCADE)
     stock_old = models.IntegerField()
     stock_new = models.IntegerField()
     stock_error = models.IntegerField(default=0)
@@ -572,8 +572,8 @@ class Supplier(models.Model):
 
 
 class SupplierArticle(models.Model):
-    supplier = models.ForeignKey(Supplier, on_delete=models.PROTECT)
+    supplier = models.ForeignKey(Supplier, on_delete=models.CASCADE)
-    article = models.ForeignKey(Article, on_delete=models.PROTECT)
+    article = models.ForeignKey(Article, on_delete=models.CASCADE)
     at = models.DateTimeField(auto_now_add=True)
     price_HT = models.DecimalField(
         max_digits=7, decimal_places=4, blank=True, null=True, default=None
@@ -588,7 +588,7 @@ class SupplierArticle(models.Model):
 
 class Order(models.Model):
     supplier = models.ForeignKey(
-        Supplier, on_delete=models.PROTECT, related_name="orders"
+        Supplier, on_delete=models.CASCADE, related_name="orders"
     )
     articles = models.ManyToManyField(
         Article, through="OrderArticle", related_name="orders"
@@ -601,8 +601,8 @@ class Order(models.Model):
 
 
 class OrderArticle(models.Model):
-    order = models.ForeignKey(Order, on_delete=models.PROTECT)
+    order = models.ForeignKey(Order, on_delete=models.CASCADE)
-    article = models.ForeignKey(Article, on_delete=models.PROTECT)
+    article = models.ForeignKey(Article, on_delete=models.CASCADE)
     quantity_ordered = models.IntegerField()
     quantity_received = models.IntegerField(default=0)
 
@@ -613,7 +613,7 @@ class TransferGroup(models.Model):
     comment = models.CharField(max_length=255, blank=True, default="")
     valid_by = models.ForeignKey(
         Account,
-        on_delete=models.PROTECT,
+        on_delete=models.SET_NULL,
         related_name="+",
         blank=True,
         null=True,
@@ -661,7 +661,7 @@ class OperationGroup(models.Model):
     comment = models.CharField(max_length=255, blank=True, default="")
     valid_by = models.ForeignKey(
         Account,
-        on_delete=models.PROTECT,
+        on_delete=models.SET_NULL,
         related_name="+",
         blank=True,
         null=True,
@@ -697,7 +697,7 @@ class Operation(models.Model):
     # Optional
     article = models.ForeignKey(
         Article,
-        on_delete=models.PROTECT,
+        on_delete=models.SET_NULL,
         related_name="operations",
         blank=True,
         null=True,