[vm] add disks inlined to VMs

uncloud_vm/admin.py

@@ -3,5 +3,13 @@ from django.contrib import admin
 # Register your models here.
 from uncloud_vm.models import *
 
-admin.site.register(VMProduct)
+class VMDiskInline(admin.TabularInline):
+    model = VMDiskProduct
+
+class VMProductAdmin(admin.ModelAdmin):
+    inlines = [
+        VMDiskInline,
+    ]
+
+admin.site.register(VMProduct, VMProductAdmin)
 admin.site.register(VMDiskProduct)

uncloud_vm/models.py

@@ -163,9 +163,10 @@ class VMDiskProduct(Product):
         choices=VMDiskType.choices,
         default=VMDiskType.CEPH_SSD)
 
-    @property
-    def description(self):
-        return "Disk for VM '{}': {}GB".format(self.vm.name, self.size_in_gb)
+    def __str__(self):
+        return "{} disk for VM '{}': {}GB".format(self.disk_type,
+                                                  self.vm.name,
+                                                  self.size_in_gb)
 
     @property
     def recurring_price(self):