feat: Add ordering for products (#925)

## Describe your changes

Fixes: #

## Checklist before requesting review

- [ ] Feature/fix PRs should add one atomic (as small as possible)
feature or fix.
- [ ] The code compiles and all the tests pass.

accounting/migrations/0027_add_account_order.py

@@ -0,0 +1,33 @@
+# Generated by Django 2.2.24 on 2023-08-16 00:11
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("accounting", "0026_rename_hidden_products_field"),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name="product",
+            options={
+                "default_permissions": [],
+                "ordering": ["ordering", "category"],
+                "permissions": [
+                    ("base", "View the Accounting tab"),
+                    ("export_orders", "Export orders"),
+                    ("ths_customer_ids", "Edit companies without THS customer IDs"),
+                ],
+                "verbose_name_plural": "Products",
+            },
+        ),
+        migrations.AddField(
+            model_name="product",
+            name="ordering",
+            field=models.IntegerField(
+                default=0,
+                help_text="Order the product. The higher the number, the higher the sorting.",
+            ),
+        ),
+    ]

accounting/models.py

@@ -65,6 +65,10 @@ class Product(models.Model):
     revenue = models.ForeignKey(Revenue, blank=False, on_delete=models.CASCADE)
     result_center = models.PositiveIntegerField(blank=False, null=False)
     cost_unit = models.PositiveIntegerField(blank=False, null=False)
+    ordering = models.IntegerField(
+        default=0,
+        help_text="Order the product. The higher the number, the higher the sorting.",
+    )
     category = models.ForeignKey(
         Category, blank=True, null=True, on_delete=models.CASCADE
     )
@@ -100,7 +104,7 @@ class Product(models.Model):
 
     class Meta:
         verbose_name_plural = "Products"
-        ordering = ["category", "name"]
+        ordering = ["ordering", "category"]
         default_permissions = []
         permissions = [
             ("base", "View the Accounting tab"),