I've been trying to a modify an admin form so I have a slightly different
user interface compared to the database model.
The main problem is this; in the database model I store a start and end time
as timestamps (a float holding seconds since 1/1/1970). But when the user
wants to edit the times I don't want him to have to deal with big float
values so I've created a new form with DateTimeFields thus;
class MyNewForm(forms.ModelForm):
start_time = forms.DateTimeField()
end_time = forms.DateTimeField()
def clean(self):
cleaned_data = self.cleaned_data
start = cleaned_data.get('start_time')
end = cleaned_data.get('end_time')
cleaned_data['start_time']=time.mktime(start.timetuple())
if end:
cleaned_data['end_time']=time.mktime(end.timetuple())
return cleaned_data
class Meta:
model = MyModel
where MyModel is just;
class MyModel(models.Model):
start_time = models.FloatField()
end_time = models.FloatField(null=True)
and the admin declaration is;
class MyModelAdmin(admin.ModelAdmin):
form = MyNewForm
Now this cleans any new date/time entries and converts them to floats before
writing to the db just fine, but if the user is editing an existing record I
can't get the existing start and end times to display as, for example,
'2009-10-25 12:00', they always show up as the float values. I've tried to
change this by adding the following __init__ method to MyNewForm;
def __init__(self, *args, **kwargs):
super(MyNewForm, self).__init__(*args, **kwargs)
instance=kwargs.get('instance','')
if instance:
self.fields['start_time'] =
forms.DateTimeField(initial=datetime.fromtimestamp(instance.start_time))
# tried this to set the initial value
self.fields['start_time'].initial =
datetime.fromtimestamp(instance.start_time) # then tried this
But neither of these seem to override the admin's rendering of the float
times and I'm not sure where that gets decided. I haven't seen any examples
similar to this but would have thought it was fairly common to change the
way data is displayed to the user for editing and then convert it back to
another form (via clean) when a change is submitted.
Paul
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