#24012: models.UUIDfield fails on Oracle backend
-------------------------------------+-------------------------------------
     Reporter:  JorisBenschop        |                    Owner:  nobody
         Type:  Uncategorized        |                   Status:  new
    Component:  Database layer       |                  Version:  master
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:
     Keywords:  oracle,              |             Triage Stage:  Accepted
  models.UUIDfield,1.8-alpha         |
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------
Changes (by mjtamlyn):

 * keywords:  oracle, models.UUIDfield => oracle, models.UUIDfield,1.8-alpha
 * stage:  Unreviewed => Accepted


Comment:

 Given that oracle has a uuid generation function, and it seems possibly an
 accepted way of storing that (in a `RAW(16)`) it would be nice to store it
 in a binary field on Oracle.

 This is somewhere between the situation for SQLite/Mysql (no good binary
 field or uuid support) and the situation for PostgreSQL (complete uuid
 support in the database driver), so may well need a new database feature.

 If this change is to be implemented, it must be done before Django 1.8 as
 once we have existing fields out there we cannot change the field type.
 Unfortunately I do not have an Oracle test environment and have little
 impetus to work on this.

 That said, I expect a full fix to look something like:
 - Change the database type for Oracle (backends/oracle/creation.py)
 - Change the converter function above
 - Add a new database feature (has_binary_uuid)
 - Check that feature in UUIDField.get_db_prep_value to convert the lookup
 value into bytes instead of a hex string

 You should make sure all the tests in `tests.model_fields.test_uuid` pass.

--
Ticket URL: <https://code.djangoproject.com/ticket/24012#comment:11>
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