Re: [Django] #7623: Multi-table inheritance: Add the ability create child instance from existing parent

[Django]

#7623: Multi-table inheritance: Add the ability create child instance from
existing parent
-------------------------------------+-------------------------------------
Reporter: brooks.travis@… | Owner:
Type: New feature | Status: new
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: model-inheritance, | Triage Stage: Accepted
multi-table-inheritance |
Has patch: 1 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by timgraham):

* owner: elektrrrus =>
* status: assigned => new

--
Ticket URL: <https://code.djangoproject.com/ticket/7623#comment:36>
Django <https://code.djangoproject.com/>
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[Django]

#7623: Multi-table inheritance: Add the ability create child instance from
existing parent
-------------------------------------+-------------------------------------

Reporter: brooks.travis@… | Owner: (none)

Type: New feature | Status: new
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: model-inheritance, | Triage Stage: Accepted
multi-table-inheritance |
Has patch: 1 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by Sergey Fedoseev):

* cc: Sergey Fedoseev (added)

--
Ticket URL: <https://code.djangoproject.com/ticket/7623#comment:37>

[Django]

#7623: Multi-table inheritance: Add the ability create child instance from
existing parent
-------------------------------------+-------------------------------------
Reporter: brooks.travis@… | Owner: (none)
Type: New feature | Status: new
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: model-inheritance, | Triage Stage: Accepted
multi-table-inheritance |
Has patch: 1 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by kamandol):

* cc: kamandol (added)

--
Ticket URL: <https://code.djangoproject.com/ticket/7623#comment:38>

[Django]

#7623: Multi-table inheritance: Add the ability create child instance from
existing parent
-------------------------------------+-------------------------------------
Reporter: brooks.travis@… | Owner: (none)
Type: New feature | Status: new
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: model-inheritance, | Triage Stage: Accepted
multi-table-inheritance |
Has patch: 1 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by Carlos Palol):

* cc: Carlos Palol (added)

--
Ticket URL: <https://code.djangoproject.com/ticket/7623#comment:39>

[Django]

#7623: Multi-table inheritance: Add the ability create child instance from
existing parent
-------------------------------------+-------------------------------------
Reporter: brooks.travis@… | Owner: (none)
Type: New feature | Status: new
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: model-inheritance, | Triage Stage: Accepted
multi-table-inheritance |
Has patch: 1 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by mrodal):

* cc: mrodal (added)

Comment:

wow, 11 years.. and it seems so simple to be able to insert a row with 1
FK and the child fields..

--
Ticket URL: <https://code.djangoproject.com/ticket/7623#comment:40>

[Django]

#7623: Multi-table inheritance: Add the ability create child instance from
existing parent
-------------------------------------+-------------------------------------
Reporter: brooks.travis@… | Owner: (none)
Type: New feature | Status: new
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: model-inheritance, | Triage Stage: Accepted
multi-table-inheritance |
Has patch: 1 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by Bel-Shazzar):

* cc: Bel-Shazzar (added)

--
Ticket URL: <https://code.djangoproject.com/ticket/7623#comment:41>

[Django]

#7623: Multi-table inheritance: Add the ability create child instance from
existing parent
-------------------------------------+-------------------------------------
Reporter: brooks.travis@… | Owner: (none)
Type: New feature | Status: new

Component: Database layer | Version: dev

(models, ORM) |
Severity: Normal | Resolution:
Keywords: model-inheritance, | Triage Stage: Accepted
multi-table-inheritance |
Has patch: 1 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by InvalidInterrupt):

* cc: InvalidInterrupt (added)

--
Ticket URL: <https://code.djangoproject.com/ticket/7623#comment:42>

[Django]

#7623: Multi-table inheritance: Add the ability create child instance from
existing parent
-------------------------------------+-------------------------------------
Reporter: brooks.travis@… | Owner: (none)
Type: New feature | Status: new
Component: Database layer | Version: dev
(models, ORM) |
Severity: Normal | Resolution:
Keywords: model-inheritance, | Triage Stage: Accepted
multi-table-inheritance |
Has patch: 1 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by Sergey Fedoseev):

* cc: Sergey Fedoseev (removed)

--
Ticket URL: <https://code.djangoproject.com/ticket/7623#comment:43>

[Django]

#7623: Multi-table inheritance: Add the ability create child instance from
existing parent
-------------------------------------+-------------------------------------
Reporter: brooks.travis@… | Owner: (none)
Type: New feature | Status: new
Component: Database layer | Version: dev
(models, ORM) |
Severity: Normal | Resolution:
Keywords: model-inheritance, | Triage Stage: Accepted
multi-table-inheritance |
Has patch: 1 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by JM Barbier):

* cc: JM Barbier (added)

--
Ticket URL: <https://code.djangoproject.com/ticket/7623#comment:44>

[Django]

#7623: Multi-table inheritance: Add the ability create child instance from
existing parent
-------------------------------------+-------------------------------------
Reporter: brooks.travis@… | Owner: (none)
Type: New feature | Status: new
Component: Database layer | Version: dev
(models, ORM) |
Severity: Normal | Resolution:
Keywords: model-inheritance, | Triage Stage: Accepted
multi-table-inheritance |
Has patch: 1 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by Charlie Denton):

* cc: Charlie Denton (added)

--
Ticket URL: <https://code.djangoproject.com/ticket/7623#comment:45>

[Django]

#7623: Multi-table inheritance: Add the ability create child instance from
existing parent
-------------------------------------+-------------------------------------
Reporter: brooks.travis@… | Owner: (none)
Type: New feature | Status: new
Component: Database layer | Version: dev
(models, ORM) |
Severity: Normal | Resolution:
Keywords: model-inheritance, | Triage Stage: Accepted
multi-table-inheritance |
Has patch: 1 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Comment (by Charlie Denton):

I'm in the process of refactoring some code to remove use of multi-table
inheritance, and the ability to create these tables separately would be
very useful to me as a part of the refactor.

--
Ticket URL: <https://code.djangoproject.com/ticket/7623#comment:46>

[Django]

#7623: Multi-table inheritance: Add the ability create child instance from
existing parent
-------------------------------------+-------------------------------------
Reporter: brooks.travis@… | Owner: (none)
Type: New feature | Status: new
Component: Database layer | Version: dev
(models, ORM) |
Severity: Normal | Resolution:
Keywords: model-inheritance, | Triage Stage: Accepted
multi-table-inheritance |
Has patch: 1 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Comment (by Simon Charette):

I wonder if the newly introduced `force_insert` feature in Django 5.0 (not
released yet) that allows specifying which tables should be inserted
happens to address this issue see (#30382 and
a40b0103bccb8216c944188d329d8ea5eceb7e92).

To take the initially reported use case

{{{#!python
parent = Restaurant.objects.get(name__iexact="Bob's Place").parent
bar = Bar(parent=parent, happy_hour=True)
bar.save(force_insert=(Bar,))
}}}

--
Ticket URL: <https://code.djangoproject.com/ticket/7623#comment:47>

[Django]

#7623: Multi-table inheritance: Add the ability create child instance from
existing parent
-------------------------------------+-------------------------------------
Reporter: brooks.travis@… | Owner: (none)
Type: New feature | Status: new
Component: Database layer | Version: dev
(models, ORM) |
Severity: Normal | Resolution:
Keywords: model-inheritance, | Triage Stage: Accepted
multi-table-inheritance |
Has patch: 1 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Comment (by HAMA Barhamou):

if this method worked:

{{{
extended_user = ExtendedUser(user_ptr_id=auth_user.pk)
extended_user.__dict__.update(auth_user.__dict__)
extended_user.save()
}}}

here: [https://stackoverflow.com/questions/4064808/django-model-
inheritance-create-sub-instance-of-existing-instance-downcast]

why not simply use it under the hood of django. Too easy. there must be
something I've missed. **I wonder what it is. do you have an idea?** or
maybe it's not enough to cover all scenarios.

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Ticket URL: <https://code.djangoproject.com/ticket/7623#comment:48>