On Monday, February 7, 2011 8:27:55 PM UTC, SimpleDimple wrote:
>
> I am new to Django and building a school system but am an experienced
> developer otherwise having firm grip over rails, .net, php & java.
>
> I have the following class where on teacher add/edit form, I am trying
> to filter values in class drop down based on school. The value of
> school_id is saved in session but as you can see below pulling value
> from session fails in ModelForm, can someone please guide me on how to
> get the value from session here ?
>
>
> class TeacherForm(ModelForm):
> def __init__(self, *args, **kwargs):
> super(TeacherForm, self).__init__(*args, **kwargs)
> xclass = self.fields['xclass'].widget
>
> choices = []
>
> #school_id = request.session['school_id'] # since this
> fails, I have hard coded the value 2 in line below for now
> school_id = 2
> xclasses = Class.objects.filter(school=school_id)
> for c in xclasses:
> choices.append((c.id,c.name))
> xclass.choices = choices
It's fundamental to Python programming generally - and, I would have
thought, Java and Ruby (although not PHP) - that if you want access to an
object in a scope, you need to pass it into that scope. In order for you to
access request.session within that __init__ method, you'll need to
explicitly make the request object available there, which means passing it
in when you initialise the form.
I usually do it like this:
class MyForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
request = kwargs.pop('request')
super(TeacherForm, self).__init__(*args, **kwargs)
...etc...
now initialise the form in your view:
form = MyForm(request=request)
--
DR.
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