#29126: Model.update_or_create method pk issue.
               Reporter:  Théo       |          Owner:  nobody
  "Bob" Massard                      |
                   Type:  Bug        |         Status:  new
              Component:  Database   |        Version:  2.0
  layer (models, ORM)                |
               Severity:  Normal     |       Keywords:
           Triage Stage:             |      Has patch:  0
  Unreviewed                         |
    Needs documentation:  0          |    Needs tests:  0
Patch needs improvement:  0          |  Easy pickings:  0
                  UI/UX:  0          |
 Upon using the `update_or_create` method on a Model which has a modified
 `pk` field, an IntegrityError happens.

 `psycopg2.IntegrityError: duplicate key value violates unique constraint

 The PrimaryKey is an IntegerField with a modified `db_column`.

Ticket URL: <https://code.djangoproject.com/ticket/29126>
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