Search code examples
djangodjango-formschoicefield

How to dynamic loading the field of ChoiceField in form using the database in Django?

Just like the answer,I want to dynamic Load the database in the choicefield, and i had do this

queue = forms.ChoiceField(label=u'queue',choices=((x.que,x.disr) for x in Queue.objects.all()))

but it doesn't work ,i must restart the server,the field can be update.

Solution

  • You need to call the __init__ to load the data in form dynamically. For example:

    class YourForm(forms.Form):
   queue = forms.ChoiceField(label=u'queue')
   def __init__(self, *args, **kwargs):
       super(YourForm, self).__init__(*args, **kwargs)
       self.fields['queue'].choices = ((x.que,x.disr) for x in Queue.objects.all()))

    Reason for doing it is that, if you call __init__ in your form, it initializes an instance of a class and updates the choice list with latest data from database. For detail understanding, check here:Why do we use __init__ in python classes?