从 Django 中的模型类生成可迭代的选择元组

Question

I'm working on a django model and I want to generate a tuple out of my model instances :

model.py

class Extra(models.Model):
    extra_n = models.CharField(max_length=200)
    extra_price = models.IntegerField(default=0)
    def __str__(self):
       return self.extra_n

The output I'm expecting based on the user entries on the form associated :

choices = (('extra_price 1','extra_n1'),
           ('extra_price 2','extra_n2'),
           ('extra_price 3','extra_n3')
)

Answer 1

You can make an ORM call with .values_list(..) [Django-doc] :

tuple(Extra.objects.)

That being said, Django forms can work with a ModelChoiceField [Django-doc] that will make choices itself based on the model (or a filtered queryset if you provide one).