ValueError: could not convert string to float.

[Sevdimali]

Hi,
I have a field like this(models.py):

value = models.FloatField(null=True)

And I have a simple form (template/form.html)

 <form action="{% url 'submit_form' %}" method="post">
    {% csrf_token %}
    <input type="hidden" name="star" value="">
    <input type="submit">
</form>

in my view, I am saving this form (views.py) :

 def submit_form(request):
    if request.method == "POST":
        print("aa")
        score = request.POST.get('star')
       
        simpleform.objects.create(
            value=score,
        )
    return redirect("/form")

and of course, I am getting this exception:

ValueError: could not convert string to float:

Adding if statement something like this to view will solve the exception:

   if len(score) == 0:
            score = None

I am thinking that maybe we can add this check to our site-packages/django/db/fields/init.py

    def get_prep_value(self, value):
        value = super().get_prep_value(value)
        if value is None:
            return None
        return float(value)

to

 def get_prep_value(self, value):
        value = super().get_prep_value(value)
        if value is None or len(value) == 0:
            return None
        return float(value)

[Mariusz Felisiak]

You're trying to use a raw value from POST to create a new model instance, in general that's not a proper way to do this. Please don't use Trac as a support channel.

Closing per TicketClosingReasons/UseSupportChannels.