Factory-H

query-replace-regexp

dar — Fri, 24 Feb 2012 15:50:55 +0000

All these years, I never knew about M-x re-builder

It allows emacs to highlight the matches in your regular expression as you type them. Very well done.

http://www.emacswiki.org/emacs/ReBuilder

Django: using multi-db with .raw

dar — Thu, 23 Feb 2012 20:26:22 +0000

Got the error QuerySet does not have raw when trying to do

MyModel.objects.using(‘slave’).raw(‘select …’)

The problem is you have to set the DB onto the db model like this:

MyModel.objects.db_manager(‘slave’).raw(‘…’)

Project planning with google docs

dar — Tue, 31 Jan 2012 04:56:21 +0000

We use Google docs where I work, and I like to plot out developer task timelines. The easiest thing to do is set up the id, dependency, start, end, %done spreadsheet and use http://lifehacker.com/5070701/add-a-gantt-chart-to-your-google-spreadsheet to throw a gantt chart on the wall with the projector. Easy to do and review on the wall.

Android and HTML5 and HLS

dar — Sat, 05 Nov 2011 23:24:05 +0000

In the long running quest for HTML5 video on Android, now with HLS – I’ve yet to find a working example of HLS on Android 3.0+. Argh.

If you know of an example, please let me know.

NameVirtualHost and ServerName

dar — Tue, 04 Oct 2011 18:54:49 +0000

More of a note to myself – was having trouble with mod_wsgi and setting up different NameVirtualHost and ServerNames. Turned out the problem was I was including a .conf file that had multiple ServerName directives. Always check that first.

Django tip of the day – use pluralize

dar — Thu, 23 Jun 2011 12:52:00 +0000

There are a bunch of built in template tags and filters to make things easier to read. Be sure to take a look at pluralize when building your pages.

It helps you easily use a plural suffix when you are listing counts of items.

Django user permissions allows is_superuser

dar — Wed, 30 Mar 2011 03:30:53 +0000

Small issue we found, if you want to give someone the ability to add/edit/delete users but don’t want them to be able to elevate privileges by setting is_superuser you have to monkey patch the UserAdmin class like this:
from django.contrib.auth.models import User from django.contrib.auth.admin import UserAdmin from django.utils.translation import ugettext_lazy as _


class MyUserAdmin(UserAdmin):

   my_fieldsets = (

       (None, {'fields': ('username', 'password')}),

       (_('Personal info'), {'fields': ('first_name', 'last_name', 'email')}),

       (_('Permissions'), {'fields':('is_active',)}),

    )
   def change_view(self, request, object_id, extra_context=None):

       # for non-superuser

       if not request.user.is_superuser:

           self.fieldsets = self.my_fieldsets

           response = UserAdmin.change_view(self, request, object_id,

extra_context=None)

           return response

       else:

           return UserAdmin.change_view(self, request, object_id,

extra_context=None)
admin.site.unregister(User)

admin.site.register(User, MyUserAdmin)

Then they won’t see the is_superuser checkbox. You’ll have to get a bit more fancy if you want to allow permission changes, but this is a good start.

Django AuthenticationForm is not showing errors but is_valid is False

dar — Thu, 03 Mar 2011 18:45:01 +0000

Got bit by this one again, which I assume is going to be pretty common if you’re trying to use the AuthenticationForm as you would normally use a form.

When I use forms, I get into the habit of doing something like this:

if request.method == 'POST':
    f = MyForm(request.POST)
    if f.is_valid():
        do_whatever()

The problem when you use the AuthenticationForm is that __init__‘s has the first parameter named request. So if you do something like this:

if request.method == 'POST':
    f = AuthenticationForm(request.POST)
    if f.is_valid():
          do_whatever()

You’ll see that the form is not valid, but you won’t get any errors. The explanation is listed in the comments here: http://code.djangoproject.com/ticket/9803, but it’s painful to learn what went wrong.

The right way to use the AuthenticationForm is do this:

if request.method == 'POST':
     f = AuthenticationForm(data=request.POST)
     if f.is_valid():
         do_whatever()

How would I fix this?
Instead of doing this:

class AuthenticationForm(forms.Form):
     def __init__(self,request=None, *args, **kwargs):

I would make request be an optional named parameter, and check for it. That’s what the code is doing later on in the clean method anyway.

Pricing AppEngine

dar — Sat, 12 Feb 2011 01:30:51 +0000

Google has a survey asking prospective pricing for new AppEngine features, please take a few minutes and fill it out here: https://groups.google.com/d/topic/google-appengine/eBdE0hyVPhE/discussion

Using Django as an OAuth provider

dar — Thu, 10 Feb 2011 05:58:15 +0000

For a while I couldn’t understand why getting a request token wasn’t working from our Django server, it kept returning 401 – it is because mod_wsgi does not pass the Authorization header by default over to Django.

To get the Authorization header, add:

WSGIPassAuthorization On

to your configuration.