Re: Can you add a build-in template tags?

[butterhuang]

Thank you very much!!

Michael P. Jung wrote:
> > How can I cache the sub-template witch is included in the main
> > template? And how can I ensure it won't be render(parse) the next
> > request?
>
> If you look at django.template.loader_tags.do_include you'll notice an
> if statement that checks if the given argument was a string. If so it'll
> use a ConstantIncludeNode rather than a normal IncludeNode. The constant
> include node inlines the sub-template while the normal node does have to
> look up that variable during render time.
>
> Side notice: That's also the reason why you can't include templates
> recursively with static strings but have to use a workaround like "{%
> with "recursive.html" as template %}{% include template %}{% endwith %}"
> or a custom template tag.
>
>
> Caching the template is as easy as storing the result from get_template
> in a global variable.
>
> e.g.
>
> from django.template.loader import get_template
> foo_template = get_template('foobar.html')
> def foo(request):
> ctx = RequestContext(request)
> ctx.update({'foo': True, 'bar': False})
> return HttpResponse(foo_template.render(ctx))
>
>
> Note: I'd rather lazy load the template in order to decouple things a
> bit. Be aware of race conditions and better synchronize the template
> loading. The above code snippet is only meant to give you the idea.
>
>
> --mp
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Re: Can you add a build-in template tags?

[Michael P. Jung]

> How can I cache the sub-template witch is included in the main
> template? And how can I ensure it won't be render(parse) the next
> request?

If you look at django.template.loader_tags.do_include you'll notice an
if statement that checks if the given argument was a string. If so it'll
use a ConstantIncludeNode rather than a normal IncludeNode. The constant
include node inlines the sub-template while the normal node does have to
look up that variable during render time.

Side notice: That's also the reason why you can't include templates
recursively with static strings but have to use a workaround like "{%
with "recursive.html" as template %}{% include template %}{% endwith %}"
or a custom template tag.


Caching the template is as easy as storing the result from get_template
in a global variable.

e.g.

from django.template.loader import get_template
foo_template = get_template('foobar.html')
def foo(request):
ctx = RequestContext(request)
ctx.update({'foo': True, 'bar': False})
return HttpResponse(foo_template.render(ctx))


Note: I'd rather lazy load the template in order to decouple things a
bit. Be aware of race conditions and better synchronize the template
loading. The above code snippet is only meant to give you the idea.


--mp

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Re: Can you add a build-in template tags?

[butterhuang]

On 10月19日, 下午4时34分, "Michael P. Jung"  wrote:
> > There is a templatetags {% include 'x.html' %}, it's very nice.  may a
> > templatetags like {% include no-parse "x.html"} is needed. It's so
> > powerful to improve the speed of include some static files which has
> > no variable,and it's so easy for you guys, isn't it?
>
> It'd be very easy to add an template tag that just includes raw data
> from a file. Though I have to comment that this might not be neccesary
> for two reasons:
>
> 1.) The Django templates parse fast and if you're not including an
> extremely large HTML file it should handle it with ease. I've never
> managed to create a CPU bound application, as the database was always
> the slowest part. If you really worry about the template performance so
> much you might be best of switching to some alternative template
> technology like jinja2, which is told to be faster. (*)
>
> 2.) The include tag inlines the included template if it's specified as
> string. So if you cache your template instances and don't regenerate
> them on every request it will get even faster. Only the first request,
> which hasn't cached the template yet will have to parse it once.
>

How can I cache the sub-template witch is included in the main
template? And how can I ensure it won't be render(parse) the next
request?



> (*) Even the jinja2 page states: "Generally speaking the performance of
> a template engine doesn’t matter much as the usual bottleneck in a web
> application is either the database or the application code."
>
> --mp
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Re: Can you add a build-in template tags?

[Michael P. Jung]

> There is a templatetags {% include 'x.html' %}, it's very nice.  may a
> templatetags like {% include no-parse "x.html"} is needed. It's so
> powerful to improve the speed of include some static files which has
> no variable,and it's so easy for you guys, isn't it?

It'd be very easy to add an template tag that just includes raw data
from a file. Though I have to comment that this might not be neccesary
for two reasons:

1.) The Django templates parse fast and if you're not including an
extremely large HTML file it should handle it with ease. I've never
managed to create a CPU bound application, as the database was always
the slowest part. If you really worry about the template performance so
much you might be best of switching to some alternative template
technology like jinja2, which is told to be faster. (*)

2.) The include tag inlines the included template if it's specified as
string. So if you cache your template instances and don't regenerate
them on every request it will get even faster. Only the first request,
which hasn't cached the template yet will have to parse it once.


(*) Even the jinja2 page states: "Generally speaking the performance of
a template engine doesn’t matter much as the usual bottleneck in a web
application is either the database or the application code."


--mp

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Re: Can you add a build-in template tags?

[butterhuang]

你好！

pay attention：

SSI ... “which must be specified using an absolute path -- in the
current page

it's not good for migrating.

谢谢！(thanks!)


On 10月19日, 上午1时26分, dc  wrote:
> Please read 
> documentationhttp://docs.djangoproject.com/en/dev/ref/templates/builtins/#ssi

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Re: Can you add a build-in template tags?

[dc]

Please read documentation 
http://docs.djangoproject.com/en/dev/ref/templates/builtins/#ssi
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Re: Can you add a build-in template tags?

[Tobias McNulty]

On Sun, Oct 18, 2009 at 12:18 PM, butterhuang  wrote:
> There is a templatetags {% include 'x.html' %}, it's very nice.  may a
> templatetags like {% include no-parse "x.html"} is needed. It's so
> powerful to improve the speed of include some static files which has
> no variable,and it's so easy for you guys, isn't it?

This would be a lot easier to discuss if you (or someone else) can
show us (a) an implementation of such a tag, and (b) some profiling
numbers that demonstrate significant savings with your method.

Tobias
-- 
Tobias McNulty
Caktus Consulting Group, LLC
P.O. Box 1454
Carrboro, NC 27510
(919) 951-0052
http://www.caktusgroup.com

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Can you add a build-in template tags?

[butterhuang]

There is a templatetags {% include 'x.html' %}, it's very nice.  may a
templatetags like {% include no-parse "x.html"} is needed. It's so
powerful to improve the speed of include some static files which has
no variable,and it's so easy for you guys, isn't it?
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