#28339: Setting db_index=False on a field doesn't actually remove the index
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Reporter: Craig de Stigter | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 1.11
Severity: Normal | Resolution:
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Description changed by Craig de Stigter:
Old description:
> 1. Make a `ForeignKey`. Don't specify a value for `db_index` (django sets
> it to `True` by default)
> 2. Make a migration for the foreignkey. This creates an index:
>
> {{{
> #!sql
> CREATE INDEX "a_c_b_id_5a026661" ON "a_c" ("b_id");
> }}}
>
> 3. Explicitly set `db_index=False` and create another migration
> 4. Check `sqlmigrate` for the new migration. Index is never actually
> removed:
>
> {{{
> #!sql
> BEGIN;
> --
> -- Alter field b on c
> --
> COMMIT;
> }}}
>
> One note: This is with postgres settings. I'm not sure if it's db-
> specific
New description:
1. Make a field with `db_index=True` (for `ForeignKey`, django sets this
by default)
2. Make a migration. This creates an index:
{{{
#!sql
CREATE INDEX "a_c_b_id_5a026661" ON "a_c" ("b_id");
}}}
3. Explicitly set `db_index=False` and create another migration
4. Check `sqlmigrate` for the new migration. Index is never actually
removed:
{{{
#!sql
BEGIN;
--
-- Alter field b on c
--
COMMIT;
}}}
One note: This is with postgres settings. I'm not sure if it's db-
specific.
--
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Ticket URL: <https://code.djangoproject.com/ticket/28339#comment:4>
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