On Mon, Jun 27, 2011 at 11:03 PM, momo2k <tkew...@googlemail.com> wrote:
> Hello,
>
> Is there a way to set dynamic default values for custom fields in the
> admin?
>
> Description of the problem:
>
> # models.py
> # there are two models
> class Meal(models.Model):
> name = ...
>
> def check_new_price(self, price):
> # checks if the price is new and creates a new price if
> neccessary
>
> class Price(models.Model):
> meal = models.ForeignKey(Meal, ....)
> valid_to = models.DateField(....) # None for current price
> amount = CurrencyField() # nearly identical to IntegerField
>
> # admin.py
> # I extended the Admin with a custom form:
> class MealModelForm(forms.ModelForm):
> price = CurrencyFormField() # Nearly identical to Decimalfield
> class Meta:
> model = Meal
>
> class MealAdmin(admin.ModelAdmin):
> form = MealModelForm
> ....
> def save_model(self, request, obj, form, change):
> super(MealAdmin, self).save_model(request, obj, form, change)
> obj.check_new_price(form.cleaned_data['price'])
>
>
> My question is: How do i tell the django admin to display the current
> price in the form field? I already tried to add an "price"-attribute
> in the ModelAdmin.get_object() method, but that doesn't work. If I
> call the Admin page for a meal, the price is blank instead of
> displaying the current price.
>
> So, repeating my first question: Is there a way to set dynamic default
> values for custom fields in the admin?
Yes, and it should be done on the __init__ method of your custom form.
class MealModelForm(forms.ModelForm):
price = CurrencyFormField() # Nearly identical to Decimalfield
class Meta:
model = Meal
def __init__(self, *args, **kwargs):
super(MealModelForm).__init__(*args, **kwargs)
if 'instance' in kwargs.keys():
self.fields['price'].initial =
Price.objects.get(meal=kwargs['instance']).amount
--
Marc
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