Add PortAssignmentTemplate for device types

netbox/dcim/filtersets.py

@@ -884,13 +884,14 @@ class FrontPortTemplateFilterSet(ChangeLoggedModelFilterSet, ModularDeviceTypeCo
         choices=PortTypeChoices,
         null_value=None
     )
-    rear_port_id = django_filters.ModelMultipleChoiceFilter(
-        queryset=RearPort.objects.all()
-    )
+    # TODO
+    # rear_port_id = django_filters.ModelMultipleChoiceFilter(
+    #     queryset=RearPortTemplate.objects.all()
+    # )
 
     class Meta:
         model = FrontPortTemplate
-        fields = ('id', 'name', 'label', 'type', 'color', 'rear_port_position', 'description')
+        fields = ('id', 'name', 'label', 'type', 'color', 'positions', 'description')
 
 
 class RearPortTemplateFilterSet(ChangeLoggedModelFilterSet, ModularDeviceTypeComponentFilterSet):
@@ -898,6 +899,10 @@ class RearPortTemplateFilterSet(ChangeLoggedModelFilterSet, ModularDeviceTypeCom
         choices=PortTypeChoices,
         null_value=None
     )
+    # TODO
+    # front_port_id = django_filters.ModelMultipleChoiceFilter(
+    #     queryset=FrontPortTemplate.objects.all()
+    # )
 
     class Meta:
         model = RearPortTemplate

netbox/dcim/forms/model_forms.py

@@ -1112,14 +1112,10 @@ class InterfaceTemplateForm(ModularComponentTemplateForm):
 
 
 class FrontPortTemplateForm(ModularComponentTemplateForm):
-    rear_port = DynamicModelChoiceField(
-        label=_('Rear port'),
-        queryset=RearPortTemplate.objects.all(),
-        required=False,
-        query_params={
-            'device_type_id': '$device_type',
-            'module_type_id': '$module_type',
-        }
+    rear_ports = forms.MultipleChoiceField(
+        choices=[],
+        label=_('Rear ports'),
+        widget=forms.SelectMultiple(attrs={'size': 8})
     )
 
     fieldsets = (
@@ -1128,15 +1124,14 @@ class FrontPortTemplateForm(ModularComponentTemplateForm):
                 FieldSet('device_type', name=_('Device Type')),
                 FieldSet('module_type', name=_('Module Type')),
             ),
-            'name', 'label', 'type', 'color', 'rear_port', 'rear_port_position', 'description',
+            'name', 'label', 'type', 'color', 'positions', 'rear_ports', 'description',
         ),
     )
 
     class Meta:
         model = FrontPortTemplate
         fields = [
-            'device_type', 'module_type', 'name', 'label', 'type', 'color', 'rear_port', 'rear_port_position',
-            'description',
+            'device_type', 'module_type', 'name', 'label', 'type', 'color', 'positions', 'description',
         ]
 
 
@@ -1581,7 +1576,7 @@ class FrontPortForm(ModularDeviceComponentForm):
     rear_ports = forms.MultipleChoiceField(
         choices=[],
         label=_('Rear ports'),
-        widget=forms.SelectMultiple(attrs={'size': 6})
+        widget=forms.SelectMultiple(attrs={'size': 8})
     )
 
     fieldsets = (

netbox/dcim/forms/object_import.py

@@ -113,31 +113,11 @@ class FrontPortTemplateImportForm(forms.ModelForm):
         label=_('Type'),
         choices=PortTypeChoices.CHOICES
     )
-    rear_port = forms.ModelChoiceField(
-        label=_('Rear port'),
-        queryset=RearPortTemplate.objects.all(),
-        to_field_name='name'
-    )
-
-    def clean_device_type(self):
-        if device_type := self.cleaned_data['device_type']:
-            rear_port = self.fields['rear_port']
-            rear_port.queryset = rear_port.queryset.filter(device_type=device_type)
-
-        return device_type
-
-    def clean_module_type(self):
-        if module_type := self.cleaned_data['module_type']:
-            rear_port = self.fields['rear_port']
-            rear_port.queryset = rear_port.queryset.filter(module_type=module_type)
-
-        return module_type
 
     class Meta:
         model = FrontPortTemplate
         fields = [
-            'device_type', 'module_type', 'name', 'type', 'color', 'rear_port', 'rear_port_position', 'label',
-            'description',
+            'device_type', 'module_type', 'name', 'type', 'color', 'positions', 'label', 'description',
         ]
 
 

netbox/dcim/migrations/0221_m2m_port_assignments.py

@@ -6,12 +6,34 @@ from itertools import islice
 
 
 def chunked(iterable, size):
-    """Yield successive chunks of a given size from an iterator."""
+    """
+    Yield successive chunks of a given size from an iterator.
+    """
     iterator = iter(iterable)
     while chunk := list(islice(iterator, size)):
         yield chunk
 
 
+def populate_port_template_assignments(apps, schema_editor):
+    FrontPortTemplate = apps.get_model('dcim', 'FrontPortTemplate')
+    PortAssignmentTemplate = apps.get_model('dcim', 'PortAssignmentTemplate')
+
+    front_ports = FrontPortTemplate.objects.iterator(chunk_size=1000)
+
+    def generate_copies():
+        for front_port in front_ports:
+            yield PortAssignmentTemplate(
+                front_port_id=front_port.pk,
+                front_port_position=None,
+                rear_port_id=front_port.rear_port_id,
+                rear_port_position=front_port.rear_port_position,
+            )
+
+    # Bulk insert in streaming batches
+    for chunk in chunked(generate_copies(), 1000):
+        PortAssignmentTemplate.objects.bulk_create(chunk, batch_size=1000)
+
+
 def populate_port_assignments(apps, schema_editor):
     FrontPort = apps.get_model('dcim', 'FrontPort')
     PortAssignment = apps.get_model('dcim', 'PortAssignment')
@@ -38,6 +60,68 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        # Create PortAssignmentTemplate model (for DeviceTypes)
+        migrations.CreateModel(
+            name='PortAssignmentTemplate',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False)),
+                (
+                    'front_port_position',
+                    models.PositiveSmallIntegerField(
+                        blank=True,
+                        null=True,
+                        validators=[
+                            django.core.validators.MinValueValidator(1),
+                            django.core.validators.MaxValueValidator(1024)
+                        ]
+                    )
+                ),
+                (
+                    'rear_port_position',
+                    models.PositiveSmallIntegerField(
+                        validators=[
+                            django.core.validators.MinValueValidator(1),
+                            django.core.validators.MaxValueValidator(1024)
+                        ]
+                    )
+                ),
+                (
+                    'front_port',
+                    models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='dcim.frontporttemplate')
+                ),
+                (
+                    'rear_port',
+                    models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='dcim.rearporttemplate')
+                ),
+            ],
+        ),
+        migrations.AddConstraint(
+            model_name='portassignmenttemplate',
+            constraint=models.UniqueConstraint(
+                fields=('front_port', 'front_port_position'),
+                name='dcim_portassignmenttemplate_unique_front_port_position'
+            ),
+        ),
+        migrations.AddConstraint(
+            model_name='portassignmenttemplate',
+            constraint=models.UniqueConstraint(
+                fields=('rear_port', 'rear_port_position'),
+                name='dcim_portassignmenttemplate_unique_rear_port_position'
+            ),
+        ),
+
+        # Add rear_ports ManyToManyField on FrontPortTemplate
+        migrations.AddField(
+            model_name='frontporttemplate',
+            name='rear_ports',
+            field=models.ManyToManyField(
+                related_name='front_ports',
+                through='dcim.PortAssignmentTemplate',
+                to='dcim.rearporttemplate'
+            ),
+        ),
+
+        # Create PortAssignment model (for Devices)
         migrations.CreateModel(
             name='PortAssignment',
             fields=[
@@ -66,22 +150,39 @@ class Migration(migrations.Migration):
                 ('rear_port', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='dcim.rearport')),
             ],
         ),
+        migrations.AddConstraint(
+            model_name='portassignment',
+            constraint=models.UniqueConstraint(
+                fields=('front_port', 'front_port_position'),
+                name='dcim_portassignment_unique_front_port_position'
+            ),
+        ),
+        migrations.AddConstraint(
+            model_name='portassignment',
+            constraint=models.UniqueConstraint(
+                fields=('rear_port', 'rear_port_position'),
+                name='dcim_portassignment_unique_rear_port_position'
+            ),
+        ),
+
+        # Add rear_ports ManyToManyField on FrontPort
         migrations.AddField(
             model_name='frontport',
             name='rear_ports',
-            field=models.ManyToManyField(related_name='front_ports', through='dcim.PortAssignment', to='dcim.rearport'),
-        ),
-        migrations.AddConstraint(
-            model_name='portassignment',
-            constraint=models.UniqueConstraint(
-                fields=('front_port', 'front_port_position'), name='dcim_portassignment_unique_front_port_position'
+            field=models.ManyToManyField(
+                related_name='front_ports',
+                through='dcim.PortAssignment',
+                to='dcim.rearport'
             ),
         ),
-        migrations.AddConstraint(
-            model_name='portassignment',
-            constraint=models.UniqueConstraint(
-                fields=('rear_port', 'rear_port_position'), name='dcim_portassignment_unique_rear_port_position'
+
+        # Data migration
+        migrations.RunPython(
+            code=populate_port_template_assignments,
+            reverse_code=migrations.RunPython.noop
         ),
+        migrations.RunPython(
+            code=populate_port_assignments,
+            reverse_code=migrations.RunPython.noop
         ),
-        migrations.RunPython(code=populate_port_assignments, reverse_code=migrations.RunPython.noop),
     ]

netbox/dcim/migrations/0222_frontport_positions.py

@@ -9,6 +9,34 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        # Remove rear_port & rear_port_position from FrontPortTemplate
+        migrations.RemoveConstraint(
+            model_name='frontporttemplate',
+            name='dcim_frontporttemplate_unique_rear_port_position',
+        ),
+        migrations.RemoveField(
+            model_name='frontporttemplate',
+            name='rear_port',
+        ),
+        migrations.RemoveField(
+            model_name='frontporttemplate',
+            name='rear_port_position',
+        ),
+
+        # Add positions on FrontPortTemplate
+        migrations.AddField(
+            model_name='frontporttemplate',
+            name='positions',
+            field=models.PositiveSmallIntegerField(
+                default=1,
+                validators=[
+                    django.core.validators.MinValueValidator(1),
+                    django.core.validators.MaxValueValidator(1024)
+                ]
+            ),
+        ),
+
+        # Remove rear_port & rear_port_position from FrontPort
         migrations.RemoveConstraint(
             model_name='frontport',
             name='dcim_frontport_unique_rear_port_position',
@@ -21,6 +49,8 @@ class Migration(migrations.Migration):
             model_name='frontport',
             name='rear_port_position',
         ),
+
+        # Add positions on FrontPort
         migrations.AddField(
             model_name='frontport',
             name='positions',

netbox/dcim/models/device_component_templates.py

@@ -518,6 +518,69 @@ class InterfaceTemplate(InterfaceValidationMixin, ModularComponentTemplateModel)
         }
 
 
+class PortAssignmentTemplate(models.Model):
+    """
+    Maps a FrontPortTemplate & position to a RearPortTemplate & position.
+    """
+    front_port = models.ForeignKey(
+        to='dcim.FrontPortTemplate',
+        on_delete=models.CASCADE,
+    )
+    front_port_position = models.PositiveSmallIntegerField(
+        blank=True,
+        null=True,
+        validators=(
+            MinValueValidator(PORT_POSITION_MIN),
+            MaxValueValidator(PORT_POSITION_MAX),
+        ),
+    )
+    rear_port = models.ForeignKey(
+        to='dcim.RearPortTemplate',
+        on_delete=models.CASCADE,
+    )
+    rear_port_position = models.PositiveSmallIntegerField(
+        validators=(
+            MinValueValidator(PORT_POSITION_MIN),
+            MaxValueValidator(PORT_POSITION_MAX),
+        ),
+    )
+
+    class Meta:
+        constraints = (
+            models.UniqueConstraint(
+                fields=('front_port', 'front_port_position'),
+                name='%(app_label)s_%(class)s_unique_front_port_position'
+            ),
+            models.UniqueConstraint(
+                fields=('rear_port', 'rear_port_position'),
+                name='%(app_label)s_%(class)s_unique_rear_port_position'
+            ),
+        )
+
+    def clean(self):
+
+        # Validate rear port assignment
+        if self.front_port.device_type_id != self.rear_port.device_type_id:
+            raise ValidationError({
+                "rear_port": _("Rear port ({rear_port}) must belong to the same device type").format(
+                    rear_port=self.rear_port
+                )
+            })
+
+        # Validate rear port position assignment
+        if self.rear_port_position > self.rear_port.positions:
+            raise ValidationError({
+                "rear_port_position": _(
+                    "Invalid rear port position ({rear_port_position}): Rear port {name} has only {positions} "
+                    "positions."
+                ).format(
+                    rear_port_position=self.rear_port_position,
+                    name=self.rear_port.name,
+                    positions=self.rear_port.positions
+                )
+            })
+
+
 class FrontPortTemplate(ModularComponentTemplateModel):
     """
     Template for a pass-through port on the front of a new Device.
@@ -531,18 +594,18 @@ class FrontPortTemplate(ModularComponentTemplateModel):
         verbose_name=_('color'),
         blank=True
     )
-    rear_port = models.ForeignKey(
-        to='dcim.RearPortTemplate',
-        on_delete=models.CASCADE,
-        related_name='frontport_templates'
-    )
-    rear_port_position = models.PositiveSmallIntegerField(
-        verbose_name=_('rear port position'),
+    positions = models.PositiveSmallIntegerField(
+        verbose_name=_('positions'),
         default=1,
         validators=[
             MinValueValidator(PORT_POSITION_MIN),
             MaxValueValidator(PORT_POSITION_MAX)
-        ]
+        ],
+    )
+    rear_ports = models.ManyToManyField(
+        to='dcim.RearPortTemplate',
+        through='dcim.PortAssignmentTemplate',
+        related_name='front_ports',
     )
 
     component_model = FrontPort
@@ -557,51 +620,17 @@ class FrontPortTemplate(ModularComponentTemplateModel):
                 fields=('module_type', 'name'),
                 name='%(app_label)s_%(class)s_unique_module_type_name'
             ),
-            models.UniqueConstraint(
-                fields=('rear_port', 'rear_port_position'),
-                name='%(app_label)s_%(class)s_unique_rear_port_position'
-            ),
         )
         verbose_name = _('front port template')
         verbose_name_plural = _('front port templates')
 
-    def clean(self):
-        super().clean()
-
-        try:
-
-            # Validate rear port assignment
-            if self.rear_port.device_type != self.device_type:
-                raise ValidationError(
-                    _("Rear port ({name}) must belong to the same device type").format(name=self.rear_port)
-                )
-
-            # Validate rear port position assignment
-            if self.rear_port_position > self.rear_port.positions:
-                raise ValidationError(
-                    _("Invalid rear port position ({position}); rear port {name} has only {count} positions").format(
-                        position=self.rear_port_position,
-                        name=self.rear_port.name,
-                        count=self.rear_port.positions
-                    )
-                )
-
-        except RearPortTemplate.DoesNotExist:
-            pass
-
     def instantiate(self, **kwargs):
-        if self.rear_port:
-            rear_port_name = self.rear_port.resolve_name(kwargs.get('module'))
-            rear_port = RearPort.objects.get(name=rear_port_name, **kwargs)
-        else:
-            rear_port = None
         return self.component_model(
             name=self.resolve_name(kwargs.get('module')),
             label=self.resolve_label(kwargs.get('module')),
             type=self.type,
             color=self.color,
-            rear_port=rear_port,
-            rear_port_position=self.rear_port_position,
+            positions=self.positions,
             **kwargs
         )
     instantiate.do_not_call_in_templates = True
@@ -611,8 +640,7 @@ class FrontPortTemplate(ModularComponentTemplateModel):
             'name': self.name,
             'type': self.type,
             'color': self.color,
-            'rear_port': self.rear_port.name,
-            'rear_port_position': self.rear_port_position,
+            'positions': self.positions,
             'label': self.label,
             'description': self.description,
         }
@@ -637,7 +665,7 @@ class RearPortTemplate(ModularComponentTemplateModel):
         validators=[
             MinValueValidator(PORT_POSITION_MIN),
             MaxValueValidator(PORT_POSITION_MAX)
-        ]
+        ],
     )
 
     component_model = RearPort