subject:"Re\: \[Django\] #7623\: Multi\-table inheritance does not allow linking new instance of child model to existing parent model instance."

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2014-02-03 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
 Reporter:  brooks.travis@…  |Owner:
 Type:  Bug  |  elektrrrus
Component:  Database layer   |   Status:  assigned
  (models, ORM)  |  Version:  master
 Severity:  Normal   |   Resolution:
 Keywords:  model-inheritance,   | Triage Stage:  Accepted
  multi-table-inheritance|  Needs documentation:  1
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  1|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by juan64645@…):

 Hello! I am new in django. I have a problem like this.
 I want to do something like this(in inheritance multi-table):

 in view.py

 restaurant = Restaurant(place_ptr=place)
 restaurant.save()

 assuming that the attributes of restaurant hold null=True.
 but Restaurant(place_ptr=place) returns nothing.

 My vercion of django is 1.5
 They say about this? Is there any alternative?
 That is not to create a new restaurant and it was clear the place, because
 it is very ugly.

 From already thank you very much!

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2014-01-26 Thread Django

Comment (by Reza Mohammadi ):

`raw=True` doesn't always work. `raw` is used for two different purposes:

The 'raw' argument is telling save_base not to save any parent models
and
not to do any changes to the values before save. This is used by fixture
loading.

For the purpose of this ticket, we want save_base ignore the first part
but we need the second part to be done.

I think `raw` argument should be split to two different arguments, as its
functionality is already separated. Not as a workaround for this bug, but
to make the code more readable.

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2014-01-26 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
 Reporter:  brooks.travis@…  |Owner:
 Type:  Bug  |  elektrrrus
Component:  Database layer   |   Status:  assigned
  (models, ORM)  |  Version:  master
 Severity:  Normal   |   Resolution:
 Keywords:  model-inheritance,   | Triage Stage:  Accepted
  multi-table-inheritance|  Needs documentation:  1
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  1|UI/UX:  0
Easy pickings:  0|
-+-
Changes (by Reza Mohammadi ):

 * cc: reza@… (added)


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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2013-12-19 Thread Django

Comment (by pcompassion):

I'd like this to be implemented as well. I have the following model
relationships and it's just hard to do what django expects me to do when
creating objects.

Thread has 1 main post.
Thread has many other posts
Post has 0-1 parent post.

There are multiple type of Threads.

It's just easier to work with when I can create BaseThread and extend it.

Besides, there are cases where I need to switch Thread types.
If it's possible to treat the base and extended separately, I can keep the
base part, and create the extension part, and connect them.

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2013-12-02 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
 Reporter:  brooks.travis@…  |Owner:
 Type:  Bug  |  elektrrrus
Component:  Database layer   |   Status:  assigned
  (models, ORM)  |  Version:  master
 Severity:  Normal   |   Resolution:
 Keywords:  model-inheritance,   | Triage Stage:  Accepted
  multi-table-inheritance|  Needs documentation:  1
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  1|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by aaugustin):

 #21537 was a duplicate.

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2013-05-18 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
 Reporter:  brooks.travis@…  |Owner:
 Type:  Bug  |  elektrrrus
Component:  Database layer   |   Status:  assigned
  (models, ORM)  |  Version:  master
 Severity:  Normal   |   Resolution:
 Keywords:  model-inheritance,   | Triage Stage:  Accepted
  multi-table-inheritance|  Needs documentation:  1
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  1|UI/UX:  0
Easy pickings:  0|
-+-
Changes (by elektrrrus):

 * status:  new => assigned
 * owner:  nobody => elektrrrus


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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2013-03-22 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
 Reporter:  brooks.travis@…  |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Database layer   |  Version:  master
  (models, ORM)  |   Resolution:
 Severity:  Normal   | Triage Stage:  Accepted
 Keywords:  model-inheritance,   |  Needs documentation:  1
  multi-table-inheritance|  Patch needs improvement:  1
Has patch:  1|UI/UX:  0
  Needs tests:  1|
Easy pickings:  0|
-+-
Changes (by akaariai):

 * stage:  Design decision needed => Accepted


Comment:

 I think this makes sense. Unlink child but keep the parent and link child
 to existing parent would both be useful in some situatios.

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2013-02-26 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
 Reporter:  brooks.travis@…  |Owner:  nobody
 Type:  Bug  |   Status:  reopened
Component:  Database layer   |  Version:  master
  (models, ORM)  |   Resolution:
 Severity:  Normal   | Triage Stage:  Design
 Keywords:  model-inheritance,   |  decision needed
  multi-table-inheritance|  Needs documentation:  1
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  1|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by loic84):

 I'm not sure it covers all bases but I use:

 {{{
 child = Restaurant(place_ptr=place)
 child.save_base(raw=True)
 }}}

 It would be great to have an obvious and officially blessed way of doing
 this though.

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2012-10-02 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
 Reporter:  brooks.travis@…  |Owner:  nobody
 Type:  Bug  |   Status:  reopened
Component:  Database layer   |  Version:  master
  (models, ORM)  |   Resolution:
 Severity:  Normal   | Triage Stage:  Design
 Keywords:  model-inheritance,   |  decision needed
  multi-table-inheritance|  Needs documentation:  1
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  1|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by sammiestoel@…):

 There is an even easier work around not 100% sure if it works as expected
 yet though:

 {{{
 child = Restaurant(place_ptr_id=place.pk)
 child.__dict__.update(place.__dict__)
 child.save()
 }}}

 Tested it myself for my use case as working.
 Thanks to: http://stackoverflow.com/questions/4064808/django-model-
 inheritance-create-sub-instance-of-existing-instance-downcast

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2012-07-09 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
 Reporter:  brooks.travis@…  |Owner:  nobody
 Type:  Bug  |   Status:  reopened
Component:  Database layer   |  Version:  master
  (models, ORM)  |   Resolution:
 Severity:  Normal   | Triage Stage:  Design
 Keywords:  model-inheritance,   |  decision needed
  multi-table-inheritance|  Needs documentation:  1
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  1|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by Edward Askew ):

 There's actually an easier workaround for this:


 {{{
 parent = Place.objects.get(...)
 child = Restaurant(place_ptr=parent,...)

 #Overwrites the parents fields except the primary key with None (because
 the parent fields in child are not auto filled)
 child.save()

 #Restores the parent fields to their previous values
 parent.save()

 #hit the database again to fill the proper values for the inherited fields
 child = Restaurant.objects.get(pk=parent.pk)
 }}}

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2012-06-07 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
 Reporter:  brooks.travis@…  |Owner:  nobody
 Type:  Bug  |   Status:  reopened
Component:  Database layer   |  Version:  master
  (models, ORM)  |   Resolution:
 Severity:  Normal   | Triage Stage:  Design
 Keywords:  model-inheritance,   |  decision needed
  multi-table-inheritance|  Needs documentation:  1
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  1|UI/UX:  0
Easy pickings:  0|
-+-
Changes (by carbonXT):

 * cc: mike@… (added)


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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2011-12-23 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
 Reporter:  brooks.travis@…  |Owner:  nobody
 Type:  Bug  |   Status:  reopened
Component:  Database layer   |  Version:  SVN
  (models, ORM)  |   Resolution:
 Severity:  Normal   | Triage Stage:  Design
 Keywords:  model-inheritance,   |  decision needed
  multi-table-inheritance|  Needs documentation:  1
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  1|UI/UX:  0
Easy pickings:  0|
-+-
Changes (by akaariai):

 * cc: anssi.kaariainen@… (added)


Comment:

 If you want to extend an existing instance, you need to copy all fields of
 the parent to the new child manually. Unfortunately this can't be done in
 a generic way using only public APIs. Although ._meta is semi-public and
 doing
 {{{
 child = ChildModel(**childfields) # set child field values
 for field in parent._meta.fields:
 setattr(child, field.attname, getattr(parent, field.attname)) # set
 child values from parent
 child.parent_ptr = parent.pk # not sure if this is strictly necessary,
 probably so...
 }}}
 or something along those lines should work (not tested). Now, I don't
 think this can be officially documented without making ._meta.fields part
 of the public API. I would have use for a helper method that does this.

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2011-12-23 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
 Reporter:  brooks.travis@…  |Owner:  nobody
 Type:  Bug  |   Status:  reopened
Component:  Database layer   |  Version:  SVN
  (models, ORM)  |   Resolution:
 Severity:  Normal   | Triage Stage:  Design
 Keywords:  model-inheritance,   |  decision needed
  multi-table-inheritance|  Needs documentation:  1
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  1|UI/UX:  0
Easy pickings:  0|
-+-
Changes (by bunyan):

 * status:  closed => reopened
 * resolution:  worksforme =>


Comment:

 This leads to the behavior described in #11618 - the parent instance
 fields get overwritten.

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2011-12-23 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
 Reporter:  brooks.travis@…  |Owner:  nobody
 Type:  Bug  |   Status:  closed
Component:  Database layer   |  Version:  SVN
  (models, ORM)  |   Resolution:
 Severity:  Normal   |  worksforme
 Keywords:  model-inheritance,   | Triage Stage:  Design
  multi-table-inheritance|  decision needed
Has patch:  1|  Needs documentation:  1
  Needs tests:  1|  Patch needs improvement:  1
Easy pickings:  0|UI/UX:  0
-+-
Changes (by aaugustin):

 * status:  reopened => closed
 * resolution:   => worksforme


Comment:

 Ah, I understand. This works:

 {{{
 p = Place.objects.get(pk=1)
 restaurant = Restaurant(place_ptr=p, ...)
 }}}

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2011-12-20 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
 Reporter:  brooks.travis@…  |Owner:  nobody
 Type:  Bug  |   Status:  reopened
Component:  Database layer   |  Version:  SVN
  (models, ORM)  |   Resolution:
 Severity:  Normal   | Triage Stage:  Design
 Keywords:  model-inheritance,   |  decision needed
  multi-table-inheritance|  Needs documentation:  1
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  1|UI/UX:  0
Easy pickings:  0|
-+-
Changes (by Nan):

 * status:  closed => reopened
 * resolution:  wontfix =>


Comment:

 Please see my example immediately above.  This is not about foreign keys
 or multiple related objects linked to the same object.  It's about multi-
 table inheritance where the child data isn't always known at the time the
 parent object is created.

 If you have a Place object that is not yet a Restaurant object, the ORM
 will not allow you to add the data to make it a Restaurant object.

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2011-12-12 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
 Reporter:  brooks.travis@…  |Owner:  nobody
 Type:  Bug  |   Status:  closed
Component:  Database layer   |  Version:  SVN
  (models, ORM)  |   Resolution:  wontfix
 Severity:  Normal   | Triage Stage:  Design
 Keywords:  model-inheritance,   |  decision needed
  multi-table-inheritance|  Needs documentation:  1
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  1|UI/UX:  0
Easy pickings:  0|
-+-
Changes (by aaugustin):

 * status:  reopened => closed
 * resolution:   => wontfix


Comment:

 If multiple related objects are linked to the same object, they should
 have a foreign key to this object, not "extend" it; that would break the
 "instance" paradigm.

 You can always use a Python mixin if you have related objects of different
 types, but want to share some methods.

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2011-11-22 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
 Reporter:  brooks.travis@…  |Owner:  nobody
 Type:  Bug  |   Status:  reopened
Component:  Database layer   |  Version:  SVN
  (models, ORM)  |   Resolution:
 Severity:  Normal   | Triage Stage:  Design
 Keywords:  model-inheritance,   |  decision needed
  multi-table-inheritance|  Needs documentation:  1
Has patch:  1|  Patch needs improvement:  1
  Needs tests:  1|UI/UX:  0
Easy pickings:  0|
-+-
Changes (by Nan):

 * status:  closed => reopened
 * resolution:  needsinfo =>


Comment:

 Here's a more reasonable example...

 {{{
 # models.py
 class Place(models.Model):
 name = models.CharField(max_length=50)
 address = models.CharField(max_length=80)

 class Restaurant(Place):
 place = models.OneToOneField(Place, parent_link=True,
 related_name='restaurant')
 serves_hot_dogs = models.BooleanField()
 serves_pizza = models.BooleanField()
 }}}

 Now, say we have a bunch of Place objects in the database, and a form
 where users can inform us what sort of business a particular Place is (OK,
 this is a contrived example, but I'm sure you can see that this could be a
 reasonable use case for some types of data).

 {{{
 # somewhere in views.py
 p = Place.objects.get(pk=1)
 restaurant = Restaurant(**{
 'place': p,
 'serves_hot_dogs': False,
 'serves_pizza': True,
 })
 restaurant.save()
 }}}

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2011-09-16 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
-+-
   Reporter: |  Owner:  nobody
  brooks.travis@…| Status:  closed
   Type:  Bug|  Component:  Database layer
  Milestone: |  (models, ORM)
Version:  SVN|   Severity:  Normal
 Resolution:  needsinfo  |   Keywords:  model-inheritance,
   Triage Stage:  Design |  multi-table-inheritance
  decision needed|  Has patch:  1
Needs documentation:  1  |Needs tests:  1
Patch needs improvement:  1  |  Easy pickings:  0
  UI/UX:  0  |
-+-
Changes (by Alex):

 * status:  new => closed
 * ui_ux:   => 0
 * resolution:   => needsinfo
 * easy:   => 0


Comment:

 Discussion with Jacob: closing as needsinfo, the modeling in the ticket
 does not seem like it *should* work, a model cannot be an instance of
 multiple subclasses.

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2011-02-27 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
+---
   Reporter:  brooks.travis@…   | Owner:  
nobody
 Status:  new   | Milestone:

  Component:  Database layer (models, ORM)  |   Version:  SVN   

 Resolution:|  Keywords:  
model-inheritance, multi-table-inheritance
   Triage Stage:  Design decision needed| Has patch:  1 

Needs documentation:  1 |   Needs tests:  1 

Patch needs improvement:  1 |  
+---
Changes (by julien):

  * component:  Core framework => Database layer (models, ORM)


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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2011-02-26 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
---+
   Reporter:  brooks.travis@…  | Owner:  nobody 
   
 Status:  new  | Milestone: 
   
  Component:  Core framework   |   Version:  SVN
   
 Resolution:   |  Keywords:  
model-inheritance, multi-table-inheritance
   Triage Stage:  Design decision needed   | Has patch:  1  
   
Needs documentation:  1|   Needs tests:  1  
   
Patch needs improvement:  1|  
---+
Changes (by sirex):

 * cc: sirexas@… (added)


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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

2009-08-01 Thread Django

#7623: Multi-table inheritance does not allow linking new instance of child 
model
to existing parent model instance.
--+-
  Reporter:  brooks.tra...@gmail.com  | Owner:  nobody  
  
Status:  new  | Milestone:  
  
 Component:  Core framework   |   Version:  SVN 
  
Resolution:   |  Keywords:  
model-inheritance, multi-table-inheritance
 Stage:  Design decision needed   | Has_patch:  1   
  
Needs_docs:  1|   Needs_tests:  1   
  
Needs_better_patch:  1|  
--+-
Comment (by kmtracey):

 #11618 was a dup.

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Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

Re: [Django] #7623: Multi-table inheritance does not allow linking new instance of child model to existing parent model instance.

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