Yuji Tomita

How to detect which fields have been changed upon saving a model.

I just needed a quick way to detect which fields have been changed as a convenience for a team.

This is what I came up with.

Is it too expensive to do comparisons like this?

Please let me know if you have any suggestions.

    def __init__(self, *args, **kwargs):
        super(Order, self).__init__(*args, **kwargs)
        self._initial_data = self.__dict__.copy()

    def detect_changed(self, user='System'):
        changed = [k for k, v in self._initial_data.iteritems() \
                        if v != self.__dict__[k] and k not in ('log','activity','_state',)]
        if changed:
            self._activity("%s changed %s" % (user.first_name, str(changed).replace('[','').replace(']','') ) )

Each ModelAdmin has a save_model method thats called whenever an object is saved.

Just override save_model(self, request, object_to_be_saved, form, change) and we have an easy way to record who last edited it.

the default profile loaded is apparently not .bashrc in the users ~ home folder, but .bash_profile.

How to setup your mac terminal page up and page down shortcuts.

Default for page up/ page down in terminal is to scroll the actual terminal, not send a page up / page down command TO the program in the terminal .

In short, open terminal settings > go to key bindings>

set page up to 33[5~
set page down to 33[6~

Note that 33 is the ESC key. Typing in \ on its own will result in an escape slash (or smth): \\

So in this case, type in ESC, [, 6, and ~.

Let me know if it helped!

This was fairly painless procedure: 1 shot did the trick.

LOTS Of googlefu was involved.

1. Installed ideneb 10.5.6
2. Screen went black after restart, so followed instructions somewhere to log in to the single user mode (f8 -s on darwin startup), mount the drive mount -uw /, and delete the AppelIntelGMA* files.
3. Reboot, and we have a crappy looking osx launched.
4. Now, I enabled root account, and downloaded the intel GMA950 kexts from http://www.insanelymac.com/forum/index.php?showtopic=156261
5. Reboot, and we have full res.
6. Sound is not around, and neither is my wireless card (looks like I need to get a different one) but this accomplishes my goal of trying OSX to see if I would like it here for web development.

Found it in the ModelAdmin class:

list_per_page = 100

class MyAdmin(admin.ModelAdmin):
list_per_page = 2000

Python has a nice string method to check if the string only contains spaces, isspace.

' '.isspace()

will return True

I was converting xml to a dict, and found many multi space empty strings that I needed to test for.

Enjoy!

Gmail push support out of the box on the iphone 4 launch OS doesn’t seem to work as advertised.

Use google sync instead, which makes you speak directly to googles servers. Setup instructions here.

I tested it, I get my email notifications within 1 or 2 seconds.

http://www.google.com/support/mobile/bin/answer.py?answer=138740&topic=14252

Chances are, you accidentally subclassed admin.ModelAdmin for a class passed as an inline.

Inlines should subclass the inline admin classes: TabularInline or StackedInline