Question

I have a selectmultiple choice widget that gets data from mysql database and displays to the user.

 list = [(x.pk, x.parameter) for x in Parameter.objects.all()]
 parameters = forms.CharField(label=("Available parameters"),widget=forms.SelectMultiple(choices=list)

For example, currently it will show like [A,B,C] in its choices.

If I delete ‘B’ directly from the database, I should be able to see only [A,C] in the selectmultiple widget(initially I thought there will be a reload and get data from database again), but that doesn’t seem to be the case, it will still display [A,B,C]. I want the selectmultiplet widget to actually show the current database at runtime, or refresh(F5) the page at least {seems to not refresh the widget too}. It will only get the new set of data if I restart the web server.

I think it might be some cache that I need to clear? Appreciate any suggestions.
Thanks

Answer 1

You need to put your code in the init method of the form, or pass the choices to the form on form creation:

def SomeForm(forms.Form):
    def __init__(self, *args, **kwargs):
        choices = [(x.pk, x.parameter) for x in Parameter.objects.all()]
        self.fields['parameters'] = forms.CharField(label="Available parameters", widget=forms.SelectMultiple(choices=choices)