#26926: Dual index migration bug?
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Reporter: Vaal | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 1.9
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 Vaal:
Old description:
> Example:
>
> 1) Added new field to model
> x_index = models.BooleanField(default=True, db_index=True, unique=True)
> There is an unnecessary index. But the conditions of the situation.
>
> 2) Create and run the migration.
> In the database this field will have only one index - unique.
>
> 3) Change the field.
> x_index = models.BooleanField(default=True, db_index=True)
> Remove the unique index.
>
> 4) Create and run the migration.
> Now, this field doesn't have of any indexes in database.
New description:
Example:
1) Added new field to model
x_index = models.BooleanField(default=True, db_index=True, unique=True)
There is an unnecessary index. But the conditions of the situation.
2) Create and run the migration.
In the database this field will have only one index - unique.
3) Change the field.
x_index = models.BooleanField(default=True, db_index=True)
Remove the unique index.
4) Create and run the migration.
Now, this field doesn't have of any indexes in database.
p.s. Mysql database
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Ticket URL: <https://code.djangoproject.com/ticket/26926#comment:3>
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