Django filter queryset __in for every item in list

Michael Zippo

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Let"s say I have the following models

class Photo(models.Model):
    tags = models.ManyToManyField(Tag)

class Tag(models.Model):
    name = models.CharField(max_length=50)

In a view I have a list with active filters called categories. I want to filter Photo objects which have all tags present in categories.

I tried:

Photo.objects.filter(tags__name__in=categories)

But this matches any item in categories, not all items.

So if categories would be ["holiday", "summer"] I want Photo"s with both a holiday and summer tag.

Can this be achieved?

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Django filter queryset in for every item in list 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

Django filter queryset in for every item in list 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 Django filter queryset __in for *every* item in list, check other __del__-related topics.

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Davies Chamberlet

Moscow | 2023-03-24

Simply put and clear. Thank you for sharing. Django filter queryset __in for *every* item in list and other issues with filter was always my weak point 😁. Checked yesterday, it works!

Schneider Nickolson

Milan | 2023-03-24

filter is always a bit confusing 😭 Django filter queryset __in for *every* item in list is not the only problem I encountered. I am just not quite sure it is the best method

Angelo Nickolson

San Francisco | 2023-03-24

I was preparing for my coding interview, thanks for clarifying this - Django filter queryset __in for *every* item in list in Python is not the simplest one. Will use it in my bachelor thesis