Template fragment caching gotchas

By : Akshar Raaj

Variables in cached template fragment

Assuming this is in template.

{% cache 300 nums %}
{% for i in nums %}
{% endfor %}
{% endcache %}

And assuming we send {'nums': range(100)} from context, then 0 to 99 will be sent in the response.

Now suppose we change context to {'nums': range(1000)}, still for next 5 minutes i.e until the cache expires, 0 to 99 will be sent in the response. 0 to 999 will not be sent in the response.

To fix this, we should use the variable too with the {% cache %} tag. So correct code would be

{% cache 300 ...

more info..
Topics : django

Retrying celery failed tasks

By : Akshar Raaj

I assume you have a basic understanding of celery. If you want to learn about basics of celery, you can check our last blog.

Use case

In one of my projects, I work with Twitter api. I need to fetch a user's tweets. Twitter provides an api endpoint for fetching user's tweets. Fetching of tweets involve network calls and so should happen in background, so we fetch the tweets using a celery task. So I have a celery task which makes one api call to Twitter. If I am able to fetch the tweets I consider the celery ...

more info..
Topics : celery
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