many-to-many in list display django

many-to-many in list display django

class PurchaseOrder(models.Model):
product = models.ManyToManyField('Product')
vendor = models.ForeignKey('VendorProfile')
dollar_amount = models.FloatField(verbose_name='Price')
class Product(models.Model):
products = models.CharField(max_length=256)
def __unicode__(self):
return self.products
I have that code. Unfortunately, the error comes in admin.py with the
"ManyToManyField"
class PurchaseOrderAdmin(admin.ModelAdmin):
fields = ['product', 'dollar_amount']
list_display = ('product', 'vendor')
The error says "'PurchaseOrderAdmin.list_display[0]', 'product' is a
ManyToManyField which is not supported."
However, it compiles when I take 'product' out of list_display. So how can
I display 'product' in list_display without giving it errors?