CustomField.validate does not check the length of a text field

[PieterL75]

NetBox version

v3.2.5

Python version

3.9

Steps to Reproduce

1. create a custom field of the type 'text'
2. use the API to update that text field with a string > 255 characters

Expected Behavior

A validation error should be thrown, as custom TEXT fields should be limited to 255 characters

Observed Behavior

The length validation is only done in the 'form' and not in validate()

https://github.com/netbox-community/netbox/blob/develop/netbox/extras/models/customfields.py#L457-L462

This part should also check the length of a TEXT custom field:

                if self.type == CustomFieldTypeChoices.TYPE_TEXT and len(value) > 255:
                    raise ValidationError(f"Value cannot contain more than 255 characters")

[jeremystretch]

IIRC we removed the length limitation when we moved custom field data to a JSON field on the object back in... whenever that was. The docs do still make reference to it, though.

So do we want to enforce the limit consistently, or remove it altogether?

[PieterL75]

If there use no real technical reason for the 255 characters, then I'd suggest to remove the limitation.
Text is then a one-line field and longtext is then the multi line field.
Then the bug report changes to : custom field of type text is limited to 255 characters in the form...