#27446: Addition of `readonly` option to ModelField to allow database generated
fields
-------------------------------------+-------------------------------------
Reporter: Ben Cole | Owner: Ben Cole
Type: New feature | Status: assigned
Component: Database layer | Version: master
(models, ORM) |
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
-------------------------------------+-------------------------------------
Description changed by Ben Cole:
Old description:
> There exist multiple use cases where a database will generate values for
> a field/column. Most RDBMSes expect that these columns be excluded from
> from `INSERT` and `UPDATE` statements. However they still need to be
> included in `SELECT` statements.
>
> The proposal therefore is to add a `readonly` option to the base `Field`
> class that when `True` would strip these fields from being compiled to
> SQL during `INSERT`s and `UPDATE`s. This allows for a very simple change
> that covers all possible write queries that Django may perform (including
> bulk_*).
>
> There exists a proof of concept https://github.com/novafloss/django-
> readonly-field
New description:
There exist multiple use cases where a database will generate values for a
field/column. Most RDBMSes expect that these columns be excluded from from
`INSERT` and `UPDATE` statements. However they still need to be included
in `SELECT` statements.
Examples include the PostgreSQL `serial` data type, triggers and functions
that generate defaults on `INSERT` (such as PostgreSQL `UUID`)
The proposal therefore is to add a `readonly` option to the base `Field`
class that when `True` would strip these fields from being compiled to SQL
during `INSERT`s and `UPDATE`s. This allows for a very simple change that
covers all possible write queries that Django may perform (including
bulk_*).
There exists a proof of concept https://github.com/novafloss/django-
readonly-field
--
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Ticket URL: <https://code.djangoproject.com/ticket/27446#comment:2>
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