The admin site uses a CSS class for each kind of field so that they can be styled easily. This snippet gives ModelForms a similar feature. See also: [James Bennett's explanation of formfield_callback](http://stackoverflow.com/questions/660929/how-do-you-change-the-default-widget-for-all-django-date-fields-in-a-modelform/661171#661171)
Call a function for each element in a queryset (actually, any list). Features: * stable memory usage (thanks to Django paginators) * progress indicators * wraps batches in transactions * can take managers or even models (e.g., `Assertion.objects`) * warns about `DEBUG`. * handles failures of single items without dying in general. * stable even if items are added or removed during processing (gets a list of ids at the start) Returns a `Status` object, with the following interesting attributes * `total`: number of items in the queryset * `num_successful`: count of successful items * `failed_ids`: list of ids of items that failed
NOTE: this is for **newforms-admin** I need edit links for items on my site, outside of the django admin -- however, I'm lazy, and don't want to build my own edit forms when there's a perfectly nice admin already there. Trick is, I need to be able to click a link to the django admin edit page for an item, and have it return to the calling page after saving. This chunk of code does the trick (the "real" version extra cruft, naturally) -- the links will bring up the django admin editor, then return to the calling page after saving.
3 snippets posted so far.