Graphql query for device_types fails after upgrade to 1.2.1

[codeVeiligst]

Environment

• Python version: 3.8.10
• Nautobot version: 1.2.1

Steps to Reproduce

1. In the graphql query browser insert the following query:

query { 
  device_types {
    id
    model
  } 
}

2. Run the query
3. With DEBUG enabled the following result is shown.

{
  "errors": [
    {
      "message": "maximum recursion depth exceeded while calling a Python object"
    }
  ],
  "data": {
    "device_types": null
  }
}

4. With uwsgi and nxing configured ngnix logs the following:

upstream prematurely closed connection while reading response header from upstream

And in the webui a HTTP 502 error is shown.

Expected Behavior

Receive all configured device types as it did before upgrading to version 1.2.1.

Observed Behavior

See point 3 and 4.

[glennmatthews]

Thanks for the report! Here's the stack trace I see:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/graphql/execution/executor.py", line 481, in complete_value_catching_error
    exe_context, return_type, field_asts, info, path, result
  File "/usr/local/lib/python3.6/site-packages/graphql/execution/executor.py", line 557, in complete_value
    exe_context, return_type, field_asts, info, path, result
  File "/usr/local/lib/python3.6/site-packages/graphql/execution/executor.py", line 599, in complete_list_value
    for item in result:
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 287, in __iter__
    self._fetch_all()
  File "/usr/local/lib/python3.6/site-packages/cacheops/query.py", line 283, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 71, in __iter__
    obj = model_cls.from_db(db, init_list, row[model_fields_start:model_fields_end])
  File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py", line 513, in from_db
    new = cls(*values)
  File "/usr/local/lib/python3.6/site-packages/nautobot/dcim/models/devices.py", line 152, in __init__
    self._original_u_height = self.u_height
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query_utils.py", line 149, in __get__
    instance.refresh_from_db(fields=[field_name])
  File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py", line 635, in refresh_from_db
    db_instance = db_instance_qs.get()
  File "/usr/local/lib/python3.6/site-packages/cacheops/query.py", line 353, in get
    return qs._no_monkey.get(qs, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 425, in get
    num = len(clone)
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 269, in __len__
    self._fetch_all()
  File "/usr/local/lib/python3.6/site-packages/cacheops/query.py", line 283, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 71, in __iter__
    obj = model_cls.from_db(db, init_list, row[model_fields_start:model_fields_end])
  File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py", line 513, in from_db
    new = cls(*values)
  File "/usr/local/lib/python3.6/site-packages/nautobot/dcim/models/devices.py", line 155, in __init__
    self._original_front_image = self.front_image
  File "/usr/local/lib/python3.6/site-packages/django/db/models/fields/files.py", line 180, in __get__
    instance.refresh_from_db(fields=[self.field.name])
  File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py", line 635, in refresh_from_db
    db_instance = db_instance_qs.get()
  File "/usr/local/lib/python3.6/site-packages/cacheops/query.py", line 353, in get
    return qs._no_monkey.get(qs, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 425, in get
    num = len(clone)
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 269, in __len__
    self._fetch_all()
  File "/usr/local/lib/python3.6/site-packages/cacheops/query.py", line 283, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 71, in __iter__
    obj = model_cls.from_db(db, init_list, row[model_fields_start:model_fields_end])
  File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py", line 513, in from_db
    new = cls(*values)
  File "/usr/local/lib/python3.6/site-packages/nautobot/dcim/models/devices.py", line 152, in __init__
    self._original_u_height = self.u_height
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query_utils.py", line 149, in __get__
    instance.refresh_from_db(fields=[field_name])
  File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py", line 635, in refresh_from_db
    db_instance = db_instance_qs.get()
  File "/usr/local/lib/python3.6/site-packages/cacheops/query.py", line 353, in get
    return qs._no_monkey.get(qs, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 425, in get
    num = len(clone)
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 269, in __len__
    self._fetch_all()
  File "/usr/local/lib/python3.6/site-packages/cacheops/query.py", line 283, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 71, in __iter__
    obj = model_cls.from_db(db, init_list, row[model_fields_start:model_fields_end])
  File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py", line 513, in from_db
    new = cls(*values)
  File "/usr/local/lib/python3.6/site-packages/nautobot/dcim/models/devices.py", line 155, in __init__
    self._original_front_image = self.front_image
...

where the following seems to be the infinite recursive loop:

  File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py", line 635, in refresh_from_db
    db_instance = db_instance_qs.get()
  File "/usr/local/lib/python3.6/site-packages/cacheops/query.py", line 353, in get
    return qs._no_monkey.get(qs, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 425, in get
    num = len(clone)
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 269, in __len__
    self._fetch_all()
  File "/usr/local/lib/python3.6/site-packages/cacheops/query.py", line 283, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 71, in __iter__
    obj = model_cls.from_db(db, init_list, row[model_fields_start:model_fields_end])
  File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py", line 513, in from_db
    new = cls(*values)
  File "/usr/local/lib/python3.6/site-packages/nautobot/dcim/models/devices.py", line 152, in __init__
    self._original_u_height = self.u_height
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query_utils.py", line 149, in __get__
    instance.refresh_from_db(fields=[field_name])
  File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py", line 635, in refresh_from_db
    db_instance = db_instance_qs.get()
  File "/usr/local/lib/python3.6/site-packages/cacheops/query.py", line 353, in get
    return qs._no_monkey.get(qs, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 425, in get
    num = len(clone)
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 269, in __len__
    self._fetch_all()
  File "/usr/local/lib/python3.6/site-packages/cacheops/query.py", line 283, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 71, in __iter__
    obj = model_cls.from_db(db, init_list, row[model_fields_start:model_fields_end])
  File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py", line 513, in from_db
    new = cls(*values)
  File "/usr/local/lib/python3.6/site-packages/nautobot/dcim/models/devices.py", line 155, in __init__
    self._original_front_image = self.front_image
  File "/usr/local/lib/python3.6/site-packages/django/db/models/fields/files.py", line 180, in __get__
    instance.refresh_from_db(fields=[self.field.name])
  File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py", line 635, in refresh_from_db
    db_instance = db_instance_qs.get()

Oddly enough I don't think this is code we've touched recently, so I'm not sure yet why this issue is appearing.

[codeVeiligst]

FYI, we upgraded from 1.1.5.