many-to-many in list display django

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You may not be able to do it directly. From the documentation of list_display

ManyToManyField fields aren’t supported, because that would entail
executing a separate SQL statement for each row in the table. If you
want to do this nonetheless, give your model a custom method, and add
that method’s name to list_display. (See below for more on custom
methods in list_display.)

You can do something like this:

class PurchaseOrderAdmin(admin.ModelAdmin):
    fields = ['product', 'dollar_amount']
    list_display = ('get_products', 'vendor')

    def get_products(self, obj):
        return "\n".join([p.products for p in obj.product.all()])

OR define a model method, and use that

class PurchaseOrder(models.Model):
    product = models.ManyToManyField('Product')
    vendor = models.ForeignKey('VendorProfile')
    dollar_amount = models.FloatField(verbose_name="Price")

    def get_products(self):
        return "\n".join([p.products for p in self.product.all()])

and in the admin list_display

list_display = ('get_products', 'vendor')

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