Re: Error when subclassing models.ForeignKey field

[roman]

On 26 Jan., 18:33, Roman Klesel  wrote:

> Should I open a bug report?

That's what I just did:
http://code.djangoproject.com/ticket/15184

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Re: Error when subclassing models.ForeignKey field

[Roman Klesel]

Hello again,

since no one responded untill now, I'd like to bring this back to attention.

If no one knows an answer to my question, maybe some one could give me
some hint what I could do?

Should I open a bug report?

Thanks in advance!

Roman

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Error when subclassing models.ForeignKey field

[Roman Klesel]

Hello,

I'm using a current SVN checkout of django an I'm having difficulties
creating a custom field.

class ForeignKeyAX(models.ForeignKey):
__metaclass__ = models.SubfieldBase
description = "ForeignKey field prepared for Ajax Autocompletion"

def __init__(self,*args,**kwargs):
self.kunde_rel=False
if kwargs.has_key('kunde_rel'):
self.kunde_rel = kwargs.pop('kunde_rel')
super(ForeignKeyAX, self).__init__(*args,**kwargs)

with this, I get the folowing error:

KeyError at /path//id/

'ip'

Request Method: GET
Request URL:http://localhost:8000/path/id/
Django Version: 1.3 beta 1 SVN-15308
Exception Type: KeyError
Exception Value:

'ip'

Exception Location:
/path-to_djanog/django/db/models/fields/subclassing.py in __get__,
line 96


and further down:

/home/roman/devel/django-trunk/django/db/models/fields/subclassing.py in __get__

89.
  def __init__(self, field):
  self.field = field

  def __get__(self, obj, type=None):

  if obj is None:
  raise AttributeError('Can only be accessed via an instance.')

96. return obj.__dict__[self.field.name]


'ip' is not contained in obj.__dict__. Like the other foreignkey
fields its there as ip_id.

What am I doing wrong? How can I get this going?

BTW: When I ommit the line:

__metaclass__ = models.SubfieldBase

Everything works fine. But then other things I want to do like
overriding to_python will not work as far as I understand.

Please help.

Best regards
   Roman

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Re: subclassing a Field

[[EMAIL PROTECTED]]

You cannot add custom database field types without altering the db
backend code.


On 31 Jan, 09:58, Antonio <[EMAIL PROTECTED]> wrote:
> hi all,
>
> I've created a TYPE in PostgreSQL :
>
> Composite type "utente.datirim"
> Column|  Type
> -+
> nome| text
> turno   | time without time zone
> comandante  | text
> disormeggio | time without time zone
> arrivo  | time without time zone
> fine| time without time zone
> inizio  | time without time zone
> attracco| time without time zone
>
> I'm trying to create a new Field in Django to map a database table into a
> model ... I've tryied to subclass Field, but I've got errors when I 'syncdb'.
>
> There's a tutorial about this procedure ?? It's possible ??
>
> tanks in advance ..
>
> PS sorry for my english ...
>
> --
> #include 
> int main(void){char 
> c[]={10,65,110,116,111,110,105,111,32,98,97,114,98,111,110,
> 101,32,60,104,105,110,100,101,109,105,116,64,116,105,115,99,97,108,105,110,101,
> 116,46,105,116,62,10,10,0};printf("%s",c);return 0;}


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subclassing a Field

[Antonio]

hi all,

I've created a TYPE in PostgreSQL :

Composite type "utente.datirim"
Column|  Type
-+
nome| text
turno   | time without time zone
comandante  | text
disormeggio | time without time zone
arrivo  | time without time zone
fine| time without time zone
inizio  | time without time zone
attracco| time without time zone

I'm trying to create a new Field in Django to map a database table into a
model ... I've tryied to subclass Field, but I've got errors when I 'syncdb'.

There's a tutorial about this procedure ?? It's possible ??

tanks in advance ..

PS sorry for my english ...

-- 
#include 
int main(void){char c[]={10,65,110,116,111,110,105,111,32,98,97,114,98,111,110,
101,32,60,104,105,110,100,101,109,105,116,64,116,105,115,99,97,108,105,110,101,
116,46,105,116,62,10,10,0};printf("%s",c);return 0;}

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To post to this group, send email to django-users@googlegroups.com
To unsubscribe from this group, send email to [EMAIL PROTECTED]
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