Prepopulate tabularinline with value from related lookup in manytomany field

问题

I have question to ask. I want to have my change_form to prepopulate the tabularinline from intances' value of related looks up (use manytomany field). So when I search kode_prod in change_form in class Order, I could get its instance and prepopulate all in my tabularinline (class Foo).

here is my model

class Product(models.Model):
    product_name= models.CharField(max_length=50)
    price = models.DecimalField(max_digits=10, decimal_places=2, default=Decimal('0.00'))
    tax_per_item = models.DecimalField(max_digits=10, null=True, blank=True, decimal_places=2, default=Decimal('0.00'))
    discount_per_item = models.DecimalField(max_digits=10, null=True, blank=True, decimal_places=2, default=Decimal('0.00'))


class Order(models.Model):
    produks = models.ManyToManyField(Product, verbose_name=u"Kode Produk")
    no_customer = models.ForeignKey(Customer, null=True, blank=True, related_name='%(class)s_kode_cust')


class Foo(models.Model):
    product = models.ForeignKey(Product, editable=False)
    pemesanan = models.ForeignKey(Order)
    quantity = models.IntegerField()
    price = models.IntegerField()
    discount = models.IntegerField()
    tax = models.IntegerField()

Class Order is manytomanyfield relationship to Product, so that in change_form I can get its instance with related looksup. Class Foo is intermediary that comes to tabularinline in change_form. So, are there some ways for me to do that ? Please help me and thank you for your kindly responses :).

回答1:

You should probably write a jQuery script that is called when a kode_prod is entered, when the page loads or when the "Add another Foo" link is clicked. You don't even need your custom submit button, since you can register an event listener for the 'blur' event.

You script sends an asynchronous XMLHttpRequest which is answered by a django view like that:

from django.core import serializers

def get_product(request, pk):
    return HttpResponse(serializers.serialize("xml", Product.objects.filter(pk=pk)))

Then in your jQuery script in the response handler populate all needed fields from the response.

Next time please be a lot more specific and clear in your question.

回答2:

do you need an relationship between Order and Product through Foo? then django-documentation might help you

来源：https://stackoverflow.com/questions/10975362/prepopulate-tabularinline-with-value-from-related-lookup-in-manytomany-field

标签

python

django

many-to-many