Custom validators unable to validate tag presence

[stuntguy3000]

NetBox version

v3.5.1

Python version

3.10

Steps to Reproduce

1. Set the Custom Validators setting to validate tag requirements

CUSTOM_VALIDATORS = {
        "ipam.ipaddress": [{"tags": {"required": True}}],
        "dcim.site": [{"tags": {"required": True}}],
        "dcim.region": [{"tags": {"required": True}}]
}

2. Create a new object defined in the list above with/without tags defined.

(This error is not exclusive to those object types)

Expected Behavior

I expected NetBox to validate if that particular object has tags set.

Observed Behavior

<class 'ValueError'>

IPAddress objects need to have a primary key value before you can access their tags.

Python version: 3.10.6
NetBox version: 3.5.1

I'm not sure if I'm asking too much from the Custom Validators here, or if another method to enforce the existence of Tags is available.

[stuntguy3000]

I'm curious if this is actually fixable?

My understanding is that the Model is passed to the custom validator, but the tag information is lost as it sits as it is different from the other fields. Validators can't access the raw form data and the tags input is not passed along down this chain.

The only fix I can even see is to either hack together more custom validation specifically for tags, or to save the object BEFORE the tags are then validated - what could go wrong.

Have to leave this for someone more versed in Django, this isn't a simple fix :(

[netopsab]

Hi,

This is the only way I have found to catch tags (or other m2m fields) with CustomValidator :

from netbox.context import current_request
from extras.models import Tag

request = current_request.get()
tags = Tag.objects.filter(id__in=request.POST.getlist('tags')).values_list('name', flat=True)

Note : this is for the 'standard' edit form. For bulk edit (or import form), you have to dig with other fields (like add_tags, remove_tags) and check the view name before (with object request.resolver_match.view_name).

from extras.models import Tag

tags = set(instance.tags.names()).union(
    Tag.objects.filter(id__in=request.POST.getlist('add_tags')).values_list('name', flat=True)
).difference(
    Tag.objects.filter(id__in=request.POST.getlist('remove_tags')).values_list('name', flat=True)
)

Hope this can help you.

NB : for tracking, this issue occurs for all m2m fields (like tagged_vlans), not just tags.

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