On Monday 19 June 2017 16:29:48 Thomas Hauk wrote:
> I am working on a project that uses Django 1.10.5 with Postgres 9.6
> (and Python 3.6.1).
>
> I am currently migrating historical data from an old system into the
> new system. This historical data has a table with a (non-primary key)
> "ID" column. I would like to migrate these rows into the new
> database, and have that column be auto-incrementing (starting from,
> say, 100000) for new rows inserted.
>
> I think the way to do this with raw Postgres SQL would be to create a
> serial field, and then run a SQL command like "SELECT
> SETVAL('some_table_field_id_seq', 100000)". I think. :)
>
> Does Django expose functionality that lets me accomplish this?
First and foremost, verify if ID meets your requirements:
- All values are unique
- They are integers
- Their values are smaller then your new cut-off (100000)
Then you can simply transform the field explicitly to primary key and then to
BigAutoField.
Setting the next value can be done using RunSQL[1].
--
Melvyn Sopacua
--------
[1] https://docs.djangoproject.com/en/1.11/ref/migration-operations/#runsql
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