Converting queryset filter() strings to their fields?
Hello,
I think the best why to explain my question is with an example. I have
a model T60CursoAdmin and a query string "a21__a21_ano" that I can use
to search with like this:
T60CursoAdmin.objects.filter(a21__a21_ano=2008)
The models look like this:
class T60Curso(models.Model):
a21 = models.ForeignKey(T21Turma,verbose_name="Turma")
ex = models.CharField()
class T21Turma(models.Model):
a21_ano = models.IntegerField("Ano")
My question is how, can I can get a reference to the 'a21_ano' field
that this filter is referencing? If the filter didn't span through the
foreign key, I could just do:
T60Curso._meta.get_field("ex")
but this doesn't work:
T60Curso._meta.get_field("a21__a21_ano")
Thanks for any and all help.
Cheers,
Bem
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Re: Converting queryset filter() strings to their fields?
On Sat, Feb 7, 2009 at 5:05 AM, Ben Gerdemann wrote:
>
> My question is how, can I can get a reference to the 'a21_ano' field
> that this filter is referencing? If the filter didn't span through the
> foreign key, I could just do:
>
> T60Curso._meta.get_field("ex")
>
> but this doesn't work:
>
> T60Curso._meta.get_field("a21__a21_ano")
get_field() only works on the local model, so you're going to need to
split the string on '__', and walk the model definitions yourself.
When you find a ForeignKey, you can get the model on the other end,
which gives you another _meta object, which you can call get_field()
on, and so on.
Yours,
Russ Magee %-)
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