Snippet List
Sometimes you need to filter foreignkey choices in admin interface, to objects created by user or meeting some other condition. In django 1.0 there is no formfield_for_foreignkey method in ModelAdmin class so we have to make a workaround. Here is the solution I have found to be the easiest for me.
Sometimes you need to write a tag that renders other template, but the template name depends on template tag arguments. Usually you use simple_tag or write your own Node class. Here is a simple aproach that uses inclusion_tag. This way you can use context objects when used with takes_context=True
Put this code somewhere in one of your INSTALLED_APPS `__init__.py` file. This code will replace the django.template.loader.get_template with cached version. Standard get_template function from django reads and parses the template code every time it's called. This version calls (if DEBUG set to False) it only once per template. After that it gets a Template object from template_cache dictionary. On django http server with template code like that:
{% extends "index.html" %}
{% block content %}
{% if form.has_errors %}
<p>Your username and password didn't match. Please try again.</p>
{% endif %}
<form method="post" action=".">
<table>
<tr><td><label for="id_username">Username:</label></td><td>{{ form.username }}</td></tr>
<tr><td><label for="id_password">Password:</label></td><td>{{ form.password }}</td></tr>
</table>
<input type="submit" value="login" />
<input type="hidden" name="next" value="{{ next }}" />
</form>
{% endblock %}
ab -n 100 on mac os x 10.5 core 2 duo 2 ghz with 2 GB of RAM gives
forge-macbook:~ forge$ ab -n 100 http://127.0.0.1:8000/login/
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/
Benchmarking 127.0.0.1 (be patient).....done
Server Software: WSGIServer/0.1
Server Hostname: 127.0.0.1
Server Port: 8000
Document Path: /login/
Document Length: 934 bytes
Concurrency Level: 1
Time taken for tests: 0.432934 seconds
Complete requests: 100
Failed requests: 0
Write errors: 0
Total transferred: 120200 bytes
HTML transferred: 93400 bytes
Requests per second: 230.98 [#/sec] (mean)
Time per request: 4.329 [ms] (mean)
Time per request: 4.329 [ms] (mean, across all concurrent requests)
Transfer rate: 270.25 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.0 0 0
Processing: 3 3 1.5 4 12
Waiting: 3 3 1.2 3 12
Total: 3 3 1.5 4 12
Percentage of the requests served within a certain time (ms)
50% 4
66% 4
75% 4
80% 4
90% 4
95% 5
98% 10
99% 12
100% 12 (longest request)
without template caching, and
forge-macbook:~ forge$ ab -n 100 http://127.0.0.1:8000/login/
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/
Benchmarking 127.0.0.1 (be patient).....done
Server Software: WSGIServer/0.1
Server Hostname: 127.0.0.1
Server Port: 8000
Document Path: /login/
Document Length: 934 bytes
Concurrency Level: 1
Time taken for tests: 0.369860 seconds
Complete requests: 100
Failed requests: 0
Write errors: 0
Total transferred: 120200 bytes
HTML transferred: 93400 bytes
Requests per second: 270.37 [#/sec] (mean)
Time per request: 3.699 [ms] (mean)
Time per request: 3.699 [ms] (mean, across all concurrent requests)
Transfer rate: 316.34 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.0 0 0
Processing: 3 3 0.9 3 9
Waiting: 2 3 0.9 3 8
Total: 3 3 0.9 3 9
Percentage of the requests served within a certain time (ms)
50% 3
66% 3
75% 3
80% 3
90% 3
95% 5
98% 8
99% 9
100% 9 (longest request)
with caching enabled.
In both cases DEBUG is set to False.
- template
- cache
- performance
- optimization
forgems has posted 3 snippets.