基于另一个模型的Django模型选择

Question

Sorry if this is confusing, I'm still a bit green with Django. So basically I have two models and I want a selection from one to have all the choices from another model. So basically:

class Show(models.Model):

venue = models.CharField(max_length=100, choices = VENUE NAME)

class Venues(models.Model):
Name = models.CharField(max_length=100)

Essentially I want the venue to have a list of the venue names that were input into that model. Is this possible?

Answer 1

In your case you should use many-to-one ForeignKey

It give you access to Venues object from your Show object and it simple to add this to your model.

class Show(models.Model):
    venue = models.ForeignKey('Venues', on_delete=models.CASCADE)

class Venues(models.Model):
    name = models.CharField(max_length=100)

To get your choices you can use:

Venues.objects.all()

And then the only thing you need is add object or ID to your Show object and save.

Choices are good too but not in this case. For example when you need some const and give user choices like this:

class Show(models.Model):
    VENUES_CHOICES = (
        (RESTAURANT, 'restaurant'),
        (PUB, 'pub'),
    )

    venues = models.IntegerField(choices=VENUES_CHOICES, default=RESTAURANT)

Its great to use it in order status in my opinion.

Answer 2

add a str def like this in the Venues model will do

def __str__ (self):
    return self.name