Fixes #10247: Allow changing selected device/VM when creating a new component (#10312)

* Initial work on #10247

* Continued work on #10247

* Clean up component creation tests

* Move valdiation of replicated field to form

* Clean up ordering of fields in component creation forms

* Omit fieldset header if none

* Clean up ordering of fields in component template creation forms

* View tests should not move component templates to new device type

* Define replication_fields on VMInterfaceCreateForm

* Clean up expandable field help texts

* Update comments

* Update component bulk update forms & views to support new replication fields

* Fix ModularDeviceComponentForm parent class

* Fix bulk creation of VM interfaces (thanks @kkthxbye-code!)

netbox/virtualization/forms/models.py

@@ -5,7 +5,6 @@ from django.core.exceptions import ValidationError
 from dcim.forms.common import InterfaceCommonForm
 from dcim.forms.models import INTERFACE_MODE_HELP_TEXT
 from dcim.models import Device, DeviceRole, Platform, Rack, Region, Site, SiteGroup
-from extras.models import Tag
 from ipam.models import IPAddress, VLAN, VLANGroup, VRF
 from netbox.forms import NetBoxModelForm
 from tenancy.forms import TenancyForm
@@ -278,6 +277,9 @@ class VirtualMachineForm(TenancyForm, NetBoxModelForm):
 
 
 class VMInterfaceForm(InterfaceCommonForm, NetBoxModelForm):
+    virtual_machine = DynamicModelChoiceField(
+        queryset=VirtualMachine.objects.all()
+    )
     parent = DynamicModelChoiceField(
         queryset=VMInterface.objects.all(),
         required=False,
@@ -338,7 +340,6 @@ class VMInterfaceForm(InterfaceCommonForm, NetBoxModelForm):
             'vlan_group', 'untagged_vlan', 'tagged_vlans', 'vrf', 'tags',
         ]
         widgets = {
-            'virtual_machine': forms.HiddenInput(),
             'mode': StaticSelect()
         }
         labels = {
@@ -347,3 +348,10 @@ class VMInterfaceForm(InterfaceCommonForm, NetBoxModelForm):
         help_texts = {
             'mode': INTERFACE_MODE_HELP_TEXT,
         }
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        # Disable reassignment of VirtualMachine when editing an existing instance
+        if self.instance.pk:
+            self.fields['virtual_machine'].disabled = True