On Thu, 2007-03-15 at 11:07 +1100, Mark Jarecki wrote:
> Hi,
>
> I was wondering how you would go about saving a model instance
> multiple times (having seperate db entries) while changing just one
> or two fields each time. I'm wanting to use a single series of inputs
> that define the parameters to create/save multiple event objects to
> the database.
>
> Just to give you a better idea of what im trying to do:
>
> class Schedule(models.Model)
> ...
> date = models.DateField()
> ...
> def save(self):
> date_list = [..]
> for d in date_list:
> self.date = d
> super(Schedule, self).save()
>
> Any suggestions, example code would be much appreciated,
Create a new copy each time. For example (untested, but should come
close):
def save(self):
...
for d in date_list:
new_obj = Schedule(**self.__dict__)
new_obj.date = d
new_obj.save()
The uses the fact that you can create a new model using the field names
as keyword arguments to __init__ and that the __dict__ attribute will
(for a typical model) contain only the field attributes.
My only slight qualm here would be that it's a bit weird to use one
model's save method to do almost everything but save that instance of
the model: it makes lots of new objects and saves those. Still, that
could be argued as being a matter of taste, so it's not a technical
obstacle. You probably do want to make sure you also save "self" at some
point in the above method, otherwise there would be no way to do it.
Regards,
Malcolm
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