[Fixed]-How to add an extra parameter to queryset results before render?

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1👍

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Your way should be working, but it’s a little hard to manage. You should create a property method on your Topic class and call it instead:

class Topic(models.Model):
    # some fields go there
    @property
    def is_unread(self):
        if self.last_posted > self.visitor.lasthit:
            return True
        else:
            return False

Then when you do topic.is_unread without the brackets it would return the value you want.

Python doc.

Edit:

Sounds like OP doesn’t have all parameters reside on Topic model. In this case it falls back to the original implementation:

for topic in topics: 
    if topic.lastposted > request.user.lastvisit.thistopic:
        topic.is_unread = True
    else:
        topic.is_unread = False

In your template you could do:

{% for topic in topics %}
    {{ topic.is_unread }}
{% endfor %}
👤Shang Wang

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