Django snippets

django-snippets

# Hello World

django_dateinput.py

from django import forms

class DateInput(forms.DateInput):
    input_type = 'date'

    def __init__(self, **kwargs):
        kwargs['format'] = '%d-%m-%y'
        super().__init__(**kwargs)

class UserProfileForm(ModelForm):

    bdate = forms.DateField()

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields['bdate'].widget = DateInput()
            
    class Meta:
        model = UserProfile
        fields = ('ph_home', 'ph_mobile', 'ph_work' ,'addr_street', 
                  'addr_city', 'addr_state', 'addr_postcode', 'addr_country',
                  'bdate', 'stu_number')

django_form_partial_update.py

 Put this in a Child Class of ModelForm 

def update_instance(self, instance, commit=True):
    # This function can be used in custom ModelForm to perform partial update
    # to an object.

    for field in instance._meta.fields:
        if field.attname in self.fields:
            setattr(
                obj=instance,
                name=field.attname,
                value=self.cleaned_data[field.attname]
            )
    if commit:
        try: 
            instance.save()
        except Exception as e:
            print(e) # Change this to log
            return False
    return instance

django_init__form_fields_with_class.py

# Add form-control class to all Django Form fields

def __init__(self, *args, **kwargs):
    super().__init__(*args, **kwargs)
    for visible in self.visible_fields():
        visible.field.widget.attrs['class'] = 'form-control'

get_human_readable_size.py

def human_readable_size(self, object):
    num = object.size
    for unit in ['','K','M','G','T','P','E','Z']:
        if abs(num) < 1024.0:
            return "%3.1f%s%s" % (num, unit, "B")
        num /= 1024.0
    return "%.1f%s%s" % (num, 'Yi', "B")