Of course I love Django, and have bet very heavily on it. But we do not know a topic, until we know it warts, so here you go. The listing is in no particular order, so sorry no numbering.
Ajax with Django is hard:
Lack of identity map:
If you get the same row from the DB twice using Model.objects.get, you will get two different objects. Apart from the performance problems of two DB queries, when only one should have done, when you update one of them, the other does not get updated, and you will have interesting things happening in your application. And if you update both of them, you might write two inconsistent changes to the DB.
Look at this code for example.
Whether Sessions are browser length/persistent are set sitewide:
You can set whether you want sessions to be browser length/persistent using
settings.py. But you can not set them per user, without mucking with django internal. This might seem a minor annoyance, yet this is something which you need to do for every app, as the remember me, function will not work without this.
Newforms is very limited:
Let us say you want the Form to contain a varible number of fields. How can you define the
NewForms class to do your biddings.
from django import newforms as forms class MyForm(forms.Form): foo = froms.CharField() bar = froms.CharField()
This can only create a form with a fixed number of fields. While there are ways to generate forms with variable number of fields, (generate the Form class programatically), they are not easy or well documented. (Remind me to write such tutorial sometime.)
Bonus question: How can you generate a form with same form elements multiple (and variable number) times, ala what happens with
Settings mixes application configuration which should be public and passwords, which should be private:
If I am distributing an app
MIDDLEWARE_CLASSES is something which I would assume users would not (generally) modify. Similarly, in most of the cases,
INSTALLED_APPS, would also be something which users would not change, (unless you are distributing standalone_apps). This means, I want to source control
settings.py also contain my DB setiings, and
SECRET_KEY, which means, I cannot source control
And while we are at it, can we refactor
settings.py, so it works without
os.environ['DJANGO_SETTINGS_MODULE'] = 'settings'
Two things which used to bug me but no more.
- You cannot extend Models - Well now you can if you use queryset-refactor, or soon can if you are on trunc.
- Url configuration using regexes. - Now they have two problems. joke notwithstanding, mapping URLs to views is one problem where regexes fit the problem beautifully. With less that 50 lines of code, you can manage a large number of views, and Url patterns.
Thank you for reading the Agiliq blog. This article was writen by shabda on Apr 18, 2008 in python .
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