#29413: `QuerySet._extract_model_params` can/should be enchanced to support lazy
               Reporter:  Viktor     |          Owner:  nobody
  Danyliuk                           |
                   Type:             |         Status:  new
  Cleanup/optimization               |
              Component:  Database   |        Version:  2.0
  layer (models, ORM)                |       Keywords:  QuerySet
               Severity:  Normal     |  get_or_create update_or_create lazy
           Triage Stage:             |      Has patch:  0
  Unreviewed                         |
    Needs documentation:  0          |    Needs tests:  0
Patch needs improvement:  0          |  Easy pickings:  0
                  UI/UX:  0          |
 I wish to have ability to write something like this:
 from django.utils.functional import lazy

 obj, created = model.objects.select_related('user').get_or_create(
      defaults=lazy(self.get_defaults_for_model, dict)(jwt)
 But at the moment `_extract_model_params` prepare defaults before it's
 realy needed.
 I think `_extract_model_params` should be separated to
 `_prepare_model_lookup` and `_prepare_model_params`.
 So it's will be possible to call `_prepare_model_params` when
 `model.DoesNotExist` or even inside `_create_object_from_params`.

Ticket URL: <https://code.djangoproject.com/ticket/29413>
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