> I'm wondering how fast is the include tag. Currently I have a Message
> model, which takes role of site messaging system with two ways of
> delivering - through a dashboard page and through Jabber. Via Jabber,
> each type of message has dedicated template and that template is then
> parsed by render_to_string and sent to the user. Everything works fine
> and I began to think about a possibility of using the same
> functionality to display them in dashboard.
>
> The main problem with dashboard is the number of messages. In Jabber
> there was only one message that was once parsed and sent but in
> dashboard I would need to present about 30 of them on a page. Going
> that way, I should put a {% for %} loop and for each message include
> its template.
>
> I don't think this is optimal - after some looking at code there would
> be a get_template() called 30 times. On the other hand, writing
> ifequal tags for each type of message in main template should be
> faster, but the template code will lose on its clearness.
>
> After some thinking I've come with another solution - writing my own
> include tag with some cache that the template will only be compiled
> once. I guess it could be a bit slower than not using any inclusion
> tags, but not much. However I'm not sure if Django does not have some
> kind of similar mechanism in its core.
>
> What do you think about this?
Here's another way to solve this: Add a rendered_version field to your
Message model and populate it at the time that the message is saved
(perhaps by overriding the Message.save method). This way, you would
just need to write {{ message.rendered_version|safe }} in your
dashboard's template loop and anywhere else you want to render that
message.
One drawback of this method is that if you want old messages to be
rendered with updated templates, it's not straightforward. Hopefully,
your use cases don't call for that.
-Rajesh D
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