> To accomplish this we are going to add a 'deleted_flag' to
> each table, and set it to 0 if it is not deleted, and 1 if it
> is deleted.
>
> Rather than going to every function I am displaying items (
> 99% of the time I'm using .filter then some filter ), is there
> a way to tell it in the model to always append delete_flag=0
> to any of the .filter parameters I am passing in, so that only
> non logically deleted items are returned? I just thought I'd
> check before trolling through thousands of lines of code for
> all of my .filter statements.
well, depending on the number of models you have (presuming you
have a manageable number) you can simply add a custom manager to
each model...something like
class NonDeleted(models.Manager):
def get_query_set(self):
return super(NonDeleted, self).get_query_set().filter(
delete_flag = 0)
and then attach that as your "objects" property (which is
normally just a models.Manager() instance):
class Foo(Model):
field_baz = ...
objects = NonDeleted()
class Bar(Model):
otherfield = ...
objects = NonDeleted()
You can read all about custom managers at
http://www.djangoproject.com/documentation/model-api/#managers
and in particular at
http://www.djangoproject.com/documentation/model-api/#modifying-initial-manager-querysets
You can even include the deleted optionally via a secondary manager:
objects = NonDeleted()
all_objects_including_deleted = models.Manager()
With the above in place, you should only need to touch your
models, not any view code.
-tim
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