Accessing admin model instance in form

Question

class ProductAdmin(admin.ModelAdmin):
    form = ProductAdminForm()

class ProductAdminForm(forms.ModelForm): 
    def __init__(self, request, *args, **kwargs):
         super(ProductAdminForm, self).__init__(*args, **kwargs)
         self.fields['field1'] = forms.CharField(required=False)
         self.fields['field2'] = forms.IntegerField()

How can I pass product instance from ProductAdmin to ProductAdminForm? I want to provide different fields depending of products instances.

Answer 1

this:

class ProductAdminForm(forms.ModelForm):
     class Meta:
         model = Product

     def __init__(self, *args, **kwargs):
         super(ProductAdminForm, self).__init__(*args, **kwargs)

             product_instance = self.instance
             if product_instance.id and product_instance.myField == "thatValue":
                 self.fields['field1'] = forms.CharField(required=False)
                 self.fields['field2'] = forms.IntegerField()