begin refactor product to user orders instead of single order

Signed-off-by: Nico Schottelius <nico@nico-notebook.schottelius.org>

uncloud_vm/migrations/0004_auto_20200809_1237.py

@@ -0,0 +1,41 @@
+# Generated by Django 3.1 on 2020-08-09 12:37
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('uncloud_pay', '0013_auto_20200809_1237'),
+        ('uncloud_vm', '0003_auto_20200808_1953'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='vmdiskproduct',
+            name='order',
+        ),
+        migrations.RemoveField(
+            model_name='vmproduct',
+            name='order',
+        ),
+        migrations.RemoveField(
+            model_name='vmsnapshotproduct',
+            name='order',
+        ),
+        migrations.AddField(
+            model_name='vmdiskproduct',
+            name='orders',
+            field=models.ManyToManyField(to='uncloud_pay.Order'),
+        ),
+        migrations.AddField(
+            model_name='vmproduct',
+            name='orders',
+            field=models.ManyToManyField(to='uncloud_pay.Order'),
+        ),
+        migrations.AddField(
+            model_name='vmsnapshotproduct',
+            name='orders',
+            field=models.ManyToManyField(to='uncloud_pay.Order'),
+        ),
+    ]

uncloud_vm/models.py

@@ -58,13 +58,10 @@ class VMProduct(Product):
         VMCluster, on_delete=models.CASCADE, editable=False, blank=True, null=True
     )
 
-    # VM-specific. The name is only intended for customers: it's a pain to
-    # remember IDs (speaking from experience as ungleich customer)!
     name = models.CharField(max_length=32, blank=True, null=True)
     cores = models.IntegerField()
     ram_in_gb = models.FloatField()
 
-    # Default recurring price is PER_MONTH, see uncloud_pay.models.Product.
     @property
     def recurring_price(self):
         return self.cores * 3 + self.ram_in_gb * 4
@@ -83,14 +80,7 @@ class VMProduct(Product):
 
 
     def __str__(self):
-        name = f"{self.id}"
-
-        if self.name:
-            name = f"{self.id} ({self.name})"
-
-        return "VM {}: {} cores {} gb ram".format(name,
-                                                  self.cores,
-                                                  self.ram_in_gb)
+        return f"VM id={self.id},name={self.name},cores={self.cores},ram_in_gb={self.ram_in_gb}"
 
 
 class VMWithOSProduct(VMProduct):
@@ -165,7 +155,7 @@ class VMDiskProduct(Product):
         default=VMDiskType.CEPH_SSD)
 
     def __str__(self):
-        return f"Disk {self.size_in_gb}GB ({self.disk_type}) for VM '{self.vm.name}'"
+        return f"Disk {self.size_in_gb}GB ({self.disk_type}) for {self.vm}"
 
     @property
     def recurring_price(self):