#28975: Skip automatic creation of postgis extension if it already exists
-------------------------------------+-------------------------------------
     Reporter:  sphrak               |                    Owner:  sphrak
         Type:                       |                   Status:  assigned
  Cleanup/optimization               |
    Component:  Database layer       |                  Version:  2.0
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:
     Keywords:  create extension,    |             Triage Stage:  Accepted
  postgis, psycopg2, postgresql      |
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------

Comment (by Ramiro Morales):

 I think the issue reported isn't that creation of the extension must be
 skipped if it already exist (as I think that's what the  `IF NOT EXISTS
 postgis` part of `CREATE EXTENSION IF NOT EXISTS postgis` is about) But
 rather that the query is tried unconditionally.

 I'd vote for removing the automatic creation of the postgis extension from
 `postgis backend DatabaseWrapper.prepare_databse()` we added in 1.8 and
 move to having users to perform it explicitly either:

 - Manually, externally -- For cases like the OP describes
 - Via a migration -- For cases in which the user Django connects to
 Postgres as has DB superuser rights there as it's assumed

-- 
Ticket URL: <https://code.djangoproject.com/ticket/28975#comment:5>
Django <https://code.djangoproject.com/>
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