Re: count the selected chechboxes in multipleselectfield

On Wednesday, July 5, 2017 at 3:59:41 PM UTC+3, bob gailer wrote:

On Jul 5, 2017 6:55 AM, "elloy" <eleni...@gmail.com> wrote:
>
> I need your help with a problem I'm trying to solve
> I'm making a questionnaire and I have to count the selected choices that the user have checked in a certain question with 5 possible answers(choices)
> The model I'm using is:
>
> class Reuse(models.Model):
>     REUSE_OPTIONS = (
>         ('1', 'first choice'),
>         ('2', 'second choice'),
>         ('3', 'third choice'),
>         ('4', 'fourth choice'),
>         ('5', 'none of the above'),
>     )
>    
>     user = models.ForeignKey(settings.AUTH_USER_MODEL, null=True, blank=True)
>     reuse = MultiSelectField(max_length=250, choices= REUSE_OPTIONS, max_choices=4, null=True)
>     m = models.DecimalField(max_digits=5, decimal_places=3, default=0)
>     numchoices = models.IntegerField()
I am not an expert in Django, but I will point out some problems. You just made an assignment to numchoices, then you redefine numchoices in the next line.
>     def numchoices(self):                                       (I tried this but it didn't work)
Telling us it didn't work is not helpful. You need to be much more explicit. What led you to say this didn't work?
>         self.choices_count = self.choice_set.count()
What are choices_count any choice_set?
>         self.save()
>
> I wrote this view:
> def reuse (request):
>     if request.method == "POST":
>         form = ReuseForm(request.POST)
>         if form.is_valid():
>             reuse = form.save(commit=False)
>            # if reuse.get_choices.count() == 1 : reuse.m=0.075        (this doesn't work either)
>           #  elif reuse.get_choices.count() == 2 : reuse.m=0.15
>            # elif reuse.get_choices.count() == 3 : reuse.m=0.225
>          #   elif reuse.get_choices.count() == 4 : reuse.m=0.3
Rather than calling the method so many times it's better to call it once and assign the result to a variable. Also in this case you can compute m from the count
>             reuse.save()
>             return redirect('../22')
>     else:
>         form = ReuseForm()
>     return render(request, 'questionnaire/reuse.html', {'form':form})
>
> And the form I'm using is:
>
> class ReuseForm(forms.ModelForm):
>
>     class Meta:
>         model = Reuse
>         fields = ('reuse',)
>  
> Please, have you got any suggestions;
By the way I don't know what the effect is of defining a function in a model. Someone else will have to deal with that. I suggest you fix problems I've pointed out run the program tell us exactly what goes wrong and where
>

I tried to make the changes you suggested like this:
models.py:
class Reuse(models.Model):
    REUSE_OPTIONS = (
         ('1', 'first choice'),
         ('2', 'second choice'),
         ('3', 'third choice'),
         ('4', 'fourth choice'),
         ('5', 'none of the above'),
     )
  
     user = models.ForeignKey(settings.

AUTH_USER_MODEL, null=True, blank=True)
     reuse = MultiSelectField(max_length=250, choices= REUSE_OPTIONS, max_choices=4, null=True)
     m = models.DecimalField(max_digits=5, decimal_places=3, default=0)

views.py:

def reuse (request):
    if request.method == "POST":
        form = ReuseForm(request.POST)
        if form.is_valid():
            reuse = form.save(commit=False)
            q = reuse.get_choices.count()
            if q == 1 : reuse.m=0.075
            elif q == 2 : reuse.m=0.15
            elif q == 3 : reuse.m=0.225
            elif q == 4 : reuse.m=0.3
            reuse.save()
            return redirect('../22')
    else:
        form = ReuseForm()
    return render(request, '../reuse.html', {'form':form})

 The error I get is the following:

Exception Type:	AttributeError
Exception Value:	'Reuse' object has no attribute 'get_choices'

I' m trying to find an attribute of the multiselectfield or a  filter that will return the number of the selected checkboxes, every time a user answer the question.
Thank you very much for your support

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