Get all Objects one by one but in a random way

Question

Here is the code from an other post :

from random import randint
count = article.objects.all().count()
random_index = randint(0, count - 1)
all_articles_query =  article.objects.all()
article = all_articles_query[random_index]

but now i would like to remove article from the list all_articles_query, and multiple time. I would like to sort a list of article then a random article and each time i sort a random article to move it from the list of article.

I would like to get all article one by one but in a random way.

Regards

This will kill the database I mean it's heavy costly @heemayl — shafik, Jan 28 '19 at 08:13
have any different if you have `all_articles_query` with random position, and get each in for loop? — Ngoc Pham, Jan 28 '19 at 08:13
[This](https://stackoverflow.com/a/9755548/5612363) should solve your problem — Anwarvic, Jan 28 '19 at 08:15

score 1 · Accepted Answer · answered Jan 28 '19 at 08:37

I think you can try like this using random.randrange:

import random

article_list = list(article.objects.all())  # evaluating queryset before everything

while article_list:
    sample = article_list.pop(random.randrange(len(article_list)))
    print(sample)

score 0 · Answer 2 · answered Jan 28 '19 at 08:15

0

You can use the Custom model manager to do that.

class ArticleManager(models.Manager):
    def random(self):
        count = self.aggregate(count=Count('id'))['count']
        random_index = randint(0, count - 1)
        return self.all()[random_index]

Then in Article model

class Article(models.Model):
    ...
    random_objects = ArticleManager()

Then in query use

Article.random_objects.random()

answered Jan 28 '19 at 08:15

shafik

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this will be get duplicate item, if number count small enough – Ngoc Pham Jan 28 '19 at 08:17
How it will return duplicate? Can you elaborate? – shafik Jan 28 '19 at 08:20
if you run `Article.random_objects.random()` so many times, it can return same object in 2 times `random()` – Ngoc Pham Jan 28 '19 at 08:36
No. I test it. all time it returns 1 object. Can you check please? – shafik Jan 28 '19 at 08:44
1

print it in `for i in xrange(0,1000):` and you can see what happen – Ngoc Pham Jan 28 '19 at 08:52

Get all Objects one by one but in a random way

2 Answers2