netbox-docker/startup_scripts/020_custom_fields.py

import sys

from extras.models import CustomField
from startup_script_utils import load_yaml


def get_class_for_class_path(class_path):
    import importlib

    from django.contrib.contenttypes.models import ContentType

    module_name, class_name = class_path.rsplit(".", 1)
    module = importlib.import_module(module_name)
    clazz = getattr(module, class_name)
    return ContentType.objects.get_for_model(clazz)


customfields = load_yaml("/opt/netbox/initializers/custom_fields.yml")

if customfields is None:
    sys.exit()

for cf_name, cf_details in customfields.items():
    custom_field, created = CustomField.objects.get_or_create(name=cf_name)

    if created:
        if cf_details.get("default", False):
            custom_field.default = cf_details["default"]

        if cf_details.get("description", False):
            custom_field.description = cf_details["description"]

        if cf_details.get("label", False):
            custom_field.label = cf_details["label"]

        for object_type in cf_details.get("on_objects", []):
            custom_field.content_types.add(get_class_for_class_path(object_type))

        if cf_details.get("required", False):
            custom_field.required = cf_details["required"]

        if cf_details.get("type", False):
            custom_field.type = cf_details["type"]

        if cf_details.get("weight", -1) >= 0:
            custom_field.weight = cf_details["weight"]

        if cf_details.get("choices", False):
            custom_field.choices = []

            for choice_detail in cf_details.get("choices", []):
                if isinstance(choice_detail, dict) and "value" in choice_detail:
                    # legacy mode
                    print(
                        f"⚠️ Please migrate the choice '{choice_detail['value']}' of '{cf_name}'"
                        + " to the new format, as 'weight' is no longer supported!"
                    )
                    custom_field.choices.append(choice_detail["value"])
                else:
                    custom_field.choices.append(choice_detail)

        custom_field.save()

        print("🔧 Created custom field", cf_name)