django-forms - w3toppers.com

How to limit file types on file uploads for ModelForms with FileFields?

Create a validation method like: def validate_file_extension(value): if not value.name.endswith(‘.pdf’): raise ValidationError(u’Error message’) and include it on the FileField validators like this: actual_file = models.FileField(upload_to=’uploaded_files’, validators=[validate_file_extension]) Also, instead of manually setting which extensions your model allows, you should create a list on your setting.py and iterate over it. Edit To filter for multiple files: def … Read more

ModelForm with OneToOneField in Django

You have to create second form for PrinterAddress and handle both forms in you view: if all((profile_form.is_valid(), address_form.is_valid())): profile = profile_form.save() address = address_form.save(commit=False) address.printer_profile = profile address.save() Of course in the template you need to show both forms under one <form> tag 🙂 <form action=”” method=”post”> {% csrf_token %} {{ profile_form }} {{ address_form … Read more

Using AuthenticationForm in Django

Try: form = AuthenticationForm(data=request.POST)

How can I order fields in Django ModelForm?

You can use: class Meta: fields = [ …, ‘date’, ‘time’, … ] See the docs: http://docs.djangoproject.com/en/dev/topics/forms/modelforms/#changing-the-order-of-fields

How to add Check Constraints for Django Model fields?

I would not put constraints like these in the save method, it’s too late. Raising an exception there, doesn’t help the user who entered the data in the wrong way, because it will end up as a 500 and the user won’t get the form with errors back etc. You should really check for this … Read more

Django Forms: pass parameter to form

You should define the __init__ method of your form, like that: class StylesForm(forms.Form): def __init__(self,*args,**kwargs): self.site_id = kwargs.pop(‘site_id’) super(StylesForm,self).__init__(*args,**kwargs) of course you cannot access self.site_id until the object has been created, so the line: height = forms.CharField(widget=forms.TextInput(attrs={‘size’:site_id})) makes no sense. You have to add the attribute to the widget after the form has been created. … Read more

Django, ModelChoiceField() and initial value

If you want to set the default initial value you should be defining initial like other form fields except you set it to the id instead. Say you’ve got field1 like this: class YourForm(forms.Form): field1 = forms.ModelChoiceField(queryset = MyModel.objects.all() ) then you need to set initial when you create your form like this: form = … Read more

Django’s forms.Form vs forms.ModelForm

Forms created from forms.Form are manually configured by you. You’re better off using these for forms that do not directly interact with models. For example a contact form, or a newsletter subscription form, where you might not necessarily be interacting with the database. Where as a form created from forms.ModelForm will be automatically created and … Read more

Change a Django form field to a hidden field

This may also be useful: {{ form.field.as_hidden }}

resize image on save

I recommend using StdImageField from django-stdimage, it should handle all the dirty work for you. It’s easy to use, you just specify the dimensions of the resized image in the field definition: class MyModel(models.Model): image = StdImageField(upload_to=’path/to/img’, size=(640, 480)) Check out the docs — it can do thumbnails also.