在django-admin面板中进行限制性选择

Question

I have 3 simple models in my Django project as below:

class Customer(models.Model):
      name = models.CharField(max_length=250)

class Location(models.Model):
      name = models.CharField(max_length=500)
      customer = models.ForeignKey(Customer)

class CustomerLocation(models.Model):
      name = models.CharField(max_length=250)
      customer = models.ForeignKey(Customer)
      location = models.ForeignKey(Location)

Now, I want to display the list of location (s) linked to a Customer in CustomerLocation in Admin panel.

For eg,

Customer = C1, Location for C1 = L1, L2.
Customer = C2, Location for C2 = L3.

If I select C1 as my Customer , I should be able choose only L1, L2 in Location . Else, it should be empty.

How can I achieve this restriction in Django-Admin?

PS: I want to achieve this via models.Admin only.

Answer 1

There is a pluggable django app for that: https://github.com/digi604/django-smart-selects

You just add a field:

location = ChainedForeignKey(
    'Location',
    chained_field='customer',
    chained_model_field='customer',
    auto_choose=True,
    null=True,
    blank=True,
)

(Not tested, but should work.)

And in Django admin, if you change Customer , Locations list changes accordingly.

---

UPD. Hm, it appears that I didn't understand your question properly.

1. What do you need Customer field in your Location model for? As far as I can see, CustomerLocation is responsible for linking these two models with one another, and every Customer may be thus linked to multiple Locations . You can achieve this with a ManyToManyField more easily, by the way.

2. Why do you need to display customers and locations at CustomerLocation ? You probably can use Django filters for that. For example:

    class CustomerLocationAdmin(admin.ModelAdmin): list_display = ('customer', 'location') list_filter = ('location', 'customer') admin.register(CustomerLocation, CustomerLocationAdmin) 

Then, you get:

1. A list of customers and locations
2. Two dropdowns for customer and location. You select particular customer or a particular location to get necessary data.

Will this solution work for you?