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.