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[Dominik <2008461@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Description
===========
Calling RequestSpec.from_primitives, which in turn calls spec._from_flavor ends with "AttributeError: module 'nova.objects' has no attribute 'Flavor'" after the check "isinstance(flavor, objects.Flavor)"

Steps to reproduce
==================
* I directly imported RequestSpec via "from nova.objects.request_spec import RequestSpec" for testing purposes
* I called RequestSpec.from_primitives
* RequestSpec.from_primitives called RequestSpec._from_flavor to fill the missing information
* RequestSpec._from_flavor performed a check "isinstance(flavor, objects.Flavor)", which resulted in the exception

Expected result
===============
I should have received a RequestSpec object or another error if the data provided was incorrect.

Actual result
=============
The exception "AttributeError: module 'nova.objects' has no attribute 'Flavor'" is raised.

Traceback:
RequestSpec.from_primitives(scheduler_connector_nova_rpc._context, dictionary_from_json, {})
  File "/home/eouser/placement-simulation-tool/venv/lib/python3.10/site-packages/nova/objects/request_spec.py", line 331, in from_primitives
    spec._from_flavor(flavor)
  File "/home/eouser/placement-simulation-tool/venv/lib/python3.10/site-packages/nova/objects/request_spec.py", line 249, in _from_flavor
    if isinstance(flavor, objects.Flavor):
AttributeError: module 'nova.objects' has no attribute 'Flavor'

Environment
===========
I use Nova 21.2.4 from PyPi, Python 3.10 on Ubuntu 20.04.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2008461

Title:
  Creating RequestSpec from flavor tries to use nonexistent attribute

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========
  Calling RequestSpec.from_primitives, which in turn calls spec._from_flavor ends with "AttributeError: module 'nova.objects' has no attribute 'Flavor'" after the check "isinstance(flavor, objects.Flavor)"

  Steps to reproduce
  ==================
  * I directly imported RequestSpec via "from nova.objects.request_spec import RequestSpec" for testing purposes
  * I called RequestSpec.from_primitives
  * RequestSpec.from_primitives called RequestSpec._from_flavor to fill the missing information
  * RequestSpec._from_flavor performed a check "isinstance(flavor, objects.Flavor)", which resulted in the exception

  Expected result
  ===============
  I should have received a RequestSpec object or another error if the data provided was incorrect.

  Actual result
  =============
  The exception "AttributeError: module 'nova.objects' has no attribute 'Flavor'" is raised.

  Traceback:
  RequestSpec.from_primitives(scheduler_connector_nova_rpc._context, dictionary_from_json, {})
    File "/home/eouser/placement-simulation-tool/venv/lib/python3.10/site-packages/nova/objects/request_spec.py", line 331, in from_primitives
      spec._from_flavor(flavor)
    File "/home/eouser/placement-simulation-tool/venv/lib/python3.10/site-packages/nova/objects/request_spec.py", line 249, in _from_flavor
      if isinstance(flavor, objects.Flavor):
  AttributeError: module 'nova.objects' has no attribute 'Flavor'

  Environment
  ===========
  I use Nova 21.2.4 from PyPi, Python 3.10 on Ubuntu 20.04.

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