many-to-many in list display django

Michael Zippo

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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?

edit: Maybe a better question would be how do you display a ManyToManyField in list_display?

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many-to-many in list display django del: Questions

__del__

How can I make a time delay in Python?

5 answers

I would like to know how to put a time delay in a Python script.

2973

Answer #1

import time
time.sleep(5)   # Delays for 5 seconds. You can also use a float value.

Here is another example where something is run approximately once a minute:

import time
while True:
    print("This prints once a minute.")
    time.sleep(60) # Delay for 1 minute (60 seconds).

2973

Answer #2

You can use the sleep() function in the time module. It can take a float argument for sub-second resolution.

from time import sleep
sleep(0.1) # Time in seconds

many-to-many in list display django del: Questions

__del__

How to delete a file or folder in Python?

5 answers

How do I delete a file or folder in Python?

2639

Answer #1

os.remove() removes a file.
os.rmdir() removes an empty directory.
shutil.rmtree() deletes a directory and all its contents.

Path objects from the Python 3.4+ pathlib module also expose these instance methods:

pathlib.Path.unlink() removes a file or symbolic link.
pathlib.Path.rmdir() removes an empty directory.

We hope this article has helped you to resolve the problem. Apart from many-to-many in list display django, check other __del__-related topics.

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Xu Nickolson

Prague | 2023-03-24

Thanks for explaining! I was stuck with many-to-many in list display django for some hours, finally got it done 🤗. Checked yesterday, it works!

Anna Emmerson

Shanghai | 2023-03-24

Thanks for explaining! I was stuck with many-to-many in list display django for some hours, finally got it done 🤗. I am just not quite sure it is the best method

Anna Jackson

Tallinn | 2023-03-24

Simply put and clear. Thank you for sharing. many-to-many in list display django and other issues with SPL PHP module was always my weak point 😁. Checked yesterday, it works!