Re: ModelAdmin, custom field: default value?

On Tue, Jun 28, 2011 at 10:27 AM, Marc Aymerich <glicerinu@gmail.com> wrote:
> On Mon, Jun 27, 2011 at 11:03 PM, momo2k <tkewolf@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

Ups, i forget something on this call:
super(MealModelForm, self).__init__(*args, **kwargs)

--
Marc

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