content: from rest_framework import serializers
  
  from dcim.models import DeviceRole, InventoryItemRole
  from extras.api.serializers_.configtemplates import ConfigTemplateSerializer
  from netbox.api.fields import RelatedObjectCountField
  from netbox.api.serializers import NestedGroupModelSerializer, NetBoxModelSerializer
  from .nested import NestedDeviceRoleSerializer
  
  __all__ = (
      'DeviceRoleSerializer',
      'InventoryItemRoleSerializer',
  )
  
  
  class DeviceRoleSerializer(NestedGroupModelSerializer):
      parent = NestedDeviceRoleSerializer(required=False, allow_null=True, default=None)
      config_template = ConfigTemplateSerializer(nested=True, required=False, allow_null=True, default=None)
      device_count = serializers.IntegerField(read_only=True, default=0)
      virtualmachine_count = serializers.IntegerField(read_only=True, default=0)
  
      class Meta:
          model = DeviceRole
          fields = [
              'id', 'url', 'display_url', 'display', 'name', 'slug', 'color', 'vm_role', 'config_template', 'parent',
              'description', 'tags', 'custom_fields', 'created', 'last_updated', 'device_count', 'virtualmachine_count',
              'comments', '_depth',
          ]
          brief_fields = (
              'id', 'url', 'display', 'name', 'slug', 'description', 'device_count', 'virtualmachine_count', '_depth'
          )
  
  
  class InventoryItemRoleSerializer(NetBoxModelSerializer):
  
      # Related object counts
      inventoryitem_count = RelatedObjectCountField('inventory_items')
  
      class Meta:
          model = InventoryItemRole
          fields = [
              'id', 'url', 'display_url', 'display', 'name', 'slug', 'color', 'description', 'tags', 'custom_fields',
              'created', 'last_updated', 'inventoryitem_count',
          ]
          brief_fields = ('id', 'url', 'display', 'name', 'slug', 'description', 'inventoryitem_count')
  