how to add to a FORM in views with django?

Question

I've posted back a form and within my view I'd like to add a a field.

Editing the slug field. It is the slug field which I've decided to hide in the form and automatically generate it in the view. How can I append the slug field to the form?

if form.is_valid():            
    form.[want_to_add_slug_field_here] = slugify(form.cleaned_data['title'])
    form.save()

I'm using (this is to hide the fields from the front end users completely as I want to automate these.

class LinkForm(forms.ModelForm):
    class Meta:
        model = Link
        exclude = ('pub_date', 'slug', 'posted_by',)

So these fields are not on my form when it's generating. I'm wanting to add these fields into the FORM before the save. Is this even possible?

score 1 · Accepted Answer · answered May 26 '11 at 10:44

There are many ways to deal with that (I assume you use ModelForm):

Use form's clean method:

class MyForm(forms.models.ModelForm):
    """ This is a form for your model. It includes all fields, but you
        won't display the slug field to the user. """

    def clean(self):
        cleaned_data = self.cleaned_data
        cleaned_data["slug"] = slugify(form.cleaned_data["title"])
        return cleaned_data

Add the slug to the model before commiting:

if form.is_valid():
     instance = form.save(commit=False)
     instance.slug = slugify(form.cleaned_data["title"])
     instance.save()

Override your model's save method:

class MyModel(models.Model):

    def save(self, *args, **kwargs):
         self.slug = slugify(self.title)
         return super(MyModel, self).save(*args, **kwargs)

Use a 3rd party autoslug field, for example django-autoslug

I personally use the 4th way.

great response. as you can see it's not only for the slug field. i'd also like to be able to manipulate other fields such as 'posted_by' before the save. i don't want to override the def save as i want the admin forms to still all be default. — darren, May 26 '11 at 11:11

score 0 · Answer 2 · answered May 26 '11 at 10:37

0

Are you looking for:

Default value when displaying form:

form.fields['slug_field'].initial = slugify(form.fields['title'].value)

Default value with no input from user, ever: You need to override the save method on the model itself:

def save(self,*args,**kwargs):
    self.slug_name = slugify(self.title)
    return super(MyModel,self).save(*args,**kwargs)

answered May 26 '11 at 10:37

Narsilou

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this assumes the slug_field is part of the form on request. i'm wanting to add a field to the form object. – darren May 26 '11 at 11:12
Yep sorry I missed that. @andrey-fedoseev 's answer is definitely what you were looking for. – Narsilou Jun 02 '11 at 21:06

score 0 · Answer 3 · edited May 23 '17 at 12:04

0

Override the form's save method as explained here: how to add the slugified field

If you slugify fields on a regular basis and on several models you could also consider writing a wrapper around the slugify-function that you can trigger with a pre_save signal.

edited May 23 '17 at 12:04

Community

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answered May 26 '11 at 10:40

arie

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thanks. i updated my question to show that it's not only the slug field that i'm trying to manipulate. – darren May 26 '11 at 11:11

how to add to a FORM in views with django?

3 Answers3