Django Model Form验证失败用于FloatField

Question

I have a model form; having a field cost . I am using jquery number on that field that appends commas when the value exceeds 999. eg

Changes 1234 to 1,234

When the user submits the form; the data is not validated. I try to catch in Clean method, but this value does not exist in self.cleaned_data. I also tried to extract that value from the self.data and convert it to 1234 float and append to self.cleaned_data and return. but that didn't work too.

Please let me konw.

Cost: Enter a number.

What am i missing?

Answer 1

https://docs.djangoproject.com/en/1.7/topics/i18n/formatting/

First, set proper locale: settings.USE_I18N, settings.USE_L10N, settings.LANGUAGE_CODE, settings.USE_THOUSAND_SEPARATOR

Second, set widget to be localized:

class MyForm(forms.ModelForm):
       ...
       def __init__(self, *args, **kwargs):
           super(MyForm, self).__init__(*args, **kwargs)
           self.fields['cost'].localize = True
           self.fields['cost'].widget.is_localized = True

if you are using forms.Form instead of modelform, then you only need to pass localize=True argument to your field definition

Edit: while FormField(localize=True) and therefore form.fileds['fieldname'].localize = True is documented, widget.is_localized is not documented and I've taken this directly from django code . So potentially behaviour may chage in next django versions and so prefered way is using FormField(localize=True)

Answer 2

Python can't convert "1,234" string to float.

>>> float("1,234")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: invalid literal for float(): 1,234
>>> 

You can sanitize this data in the form's __init__ method:

class MyForm(forms.Form):
    def __init__(self, data=None, *args, **kwargs)
        if data and 'cost' in data:
            data['cost'] = data['cost'].replace(',', '')
        super(MyForm, self).__init__(data, *args, **kwargs)

Answer 3

You can just override the default field like this:

class MyForm(forms.ModelForm):
    cost = forms.CharField()

    def clean_cost(self):
        data = self.cleaned_data['cost']
        return float(data.replace(',', ''))

    class Meta:
       model = MyModel
       field = {'cost', ...}

Detailed documentation is here: https://docs.djangoproject.com/en/1.7/topics/forms/modelforms/#overriding-the-default-fields