paginate related queryset in django

Question

I have two models named Card and Comment, both are related with a foreign key

class Card(models.Model):
    image = models.CharField(max_length=100, default="")
    email = models.EmailField(unique=True, max_length=30, null = False, blank=False, default="")
    mobile = models.CharField(unique=True, max_length=12, null = False, blank=False, default="")
    uploaded_time = models.DateTimeField(auto_now_add=True)
    name = models.CharField(unique=True, max_length=30, null = False, blank=False, default="")
    active = models.BooleanField(default=True)

    def __str__(self):
        return self.name

class Comment(models.Model):
    image = models.ForeignKey(Card, on_delete=models.CASCADE, related_name="comments")
    comment = models.CharField(max_length=100, blank=False, null=False)
    valid = models.BooleanField(default=False)

I want to access card along with limited (comment size say 5) comments with select_related or prefetch_related query

I have a load more button for comments, so when ever i press load more i want 5 more comments to be fetched

someone pls answer, thnks:)

Answer 1

To paginate a queryset in Django, you can use the Paginator class:

This will paginate the queryset, allowing you to access only the items on the specified page.

To paginate a queryset that includes related objects, you can use the select_related method to prefetch the related objects.

Here's an example:

# Assume that your queryset includes related objects, and that you want to prefetch them
my_queryset = Comment.objects.filter(image__id=your_id).values("comment")

# Create the paginator object as described above
paginator = Paginator(my_queryset, 5)

# Get the page number from the query string
page_number = request.GET.get('page')

# Get the page object for the specified page number
page_obj = paginator.get_page(page_number)

# Use the page object to access the items on the specified page
page_items = page_obj.object_list