>
> I really tried hard to understand your problem, but then my brain
> started to leak out of my ears and I had to stop. :-(
>
> Could you post an example of how all these models are related? You seem
> to have Relmodl2, model2 and model1 and I'm not sure what all the
> linkages are.
>
> I think what you are asking is why does the reverse end of a ForeignKey
> show up in get_all_related_objects(), but the forward direction does
> not. If that is the question, the forward direction (the ForeignKey
> field itself), is just an object of class ForeignKey in the _meta.fields
> attribute on the model it is defined on. So you need to inspect the
> class types in _meta.fields to see which are the forwards relations.
>
> If that isn't your question, I apologise and ask only for a simple
> example to illustrate the problem.
>
> Regards,
> Malcolm
sorry, shouldn't post so late I guess...
I would like to make a list of allowable arguments for filter
to supply that as a selection list on a search page.
so I have to get a list of 'model__field' like strings
derived from models (models.get_all_models())
class Poll(models.Model):
question = models.CharField(maxlength=200)
pub_date = models.DateTimeField('date published')
class Choice(models.Model):
poll = models.ForeignKey(Poll)
choice = models.CharField(maxlength=200)
votes = models.IntegerField()
relfieldargs = ['%s__%s' % (m.model._meta.module_name,f.name)
for m in Poll._meta.get_all_related_objects()
for f in m.model._meta.fields ]
relfieldargs:
['choice__id', 'choice__poll', 'choice__choice', 'choice__votes']
I can use these as (part of)arguments for filter
Poll.objects.filter(choice__votes__gt=0)
but the other way around doesn't work (from Choice->Poll)
relfieldargs = ['%s__%s' % (m.model._meta.module_name,f.name)
for m in Choice._meta.get_all_related_objects()
for f in m.model._meta.fields ]
relfieldargs:
[]
so I need some other way to get those.
Now you seem to say that the answer is in here,
In [18]: [f for f in Choice._meta.fields]
Out[18]:
[<django.db.models.fields.AutoField object at 0xb7c87bcc>,
<django.db.models.fields.related.ForeignKey object at 0xb7c8744c>,
<django.db.models.fields.CharField object at 0xb7c8772c>,
<django.db.models.fields.IntegerField object at 0xb7c879ac>]
which I can see. but how do a make an expression to test for
foreignkey
(except for 'fields.related' in `f` which seems a bit clumsy)
and then of course I would like to find the 2nd (or higher) order
cases too
'model1__model2__field_of_model2'
any simple ways to find those?
thanks for your help.
abe
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