#26034: Altering CharFields to have both db_index=True and unique=True crashes 
on
postgresql
----------------------------------------------+--------------------
     Reporter:  kaedroho                      |      Owner:  nobody
         Type:  Bug                           |     Status:  new
    Component:  Database layer (models, ORM)  |    Version:  1.9
     Severity:  Normal                        |   Keywords:
 Triage Stage:  Unreviewed                    |  Has patch:  0
Easy pickings:  0                             |      UI/UX:  0
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 Hi Everyone,

 If you have a CharField with db_index=True and alter it to have both
 "db_index=True" and "unique=True" the migration for this will not run on
 PostgreSQL.

 Instead, you will get the following error:

     django.db.utils.ProgrammingError: relation
 "app_mymodel_my_field_3922656f_like" already exists

 This bug apears to have been introduced in Django 1.8.7/1.9.1. Git bisect
 leads to this commit:
 
https://github.com/django/django/commit/722fae4b5159b2810e252e3385936f86f04eb09b

 I have created a test project that should hopefully help diagnosis:
 https://github.com/kaedroho/djangobugtest2/

 Thanks,

 Karl

--
Ticket URL: <https://code.djangoproject.com/ticket/26034>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.

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