Assuming that I have such model
COLORS= (
('R', 'Red'),
('B', 'Yellow'),
('G', 'White'),
)
class Car(models.Model):
name = models.CharField(max_length=20)
color= models.CharField(max_length=1, choices=COLORS)
It displays as a selectbox in the admin panel however I would like my admin-user to multi select those colors like many-to-many relationship, how can this be achieved without a ('RB', 'Red&Blue'), type of logic
The easiest way I found (just I use eval() to convert string gotten from input to tuple to read again for form instance or other place)
This trick works very well
#model.py
class ClassName(models.Model):
field_name = models.CharField(max_length=100)
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
if self.field_name:
self.field_name= eval(self.field_name)
#form.py
CHOICES = [('pi', 'PI'), ('ci', 'CI')]
class ClassNameForm(forms.ModelForm):
field_name = forms.MultipleChoiceField(choices=CHOICES)
class Meta:
model = ClassName
fields = ['field_name',]
#view.py
def viewfunction(request, pk):
ins = ClassName.objects.get(pk=pk)
form = ClassNameForm(instance=ins)
if request.method == 'POST':
form = form (request.POST, instance=ins)
if form.is_valid():
form.save()
...
Django models come with JSONField() which you could use to serialize the list of integer values and later deserialize it into a list. List of integers are your colors.
https://docs.djangoproject.com/en/4.0/ref/models/fields/#django.db.models.JSONField