Using url parameter in a class based view to set form field

Question

I am creating a form in my django app. My app has a user, a user can have many transactions and a transaction can have many sales. I'm trying to create a form to add sales to the DB. I'm trying to pass a parameter in the URL (transaction_id) and use it in the Django class-based view CreateView to set the corresponding (foreign key) field in the form. Is it possible to do this and if so how could I apply it.

Class based create view below

class SaleCreateView(CreateView):
    model = Sale
    fields = ['amount_sold', 'total_price_sold', 'note']

    def form_valid(self, form):

URL below

path('sale/new/<int:pk>', SaleCreateView.as_view(), name='sale-create'),

Link below

{% url 'sale-create' transaction.id %}

Sale form below

<div>
    <form method="POST">
        {% csrf_token %}
        <fieldset class ="form-group">
            <legend class="border-bottom mb-4">Enter Sale</legend>
            {{ form|crispy }}
        </fieldset>
        <div class="form-group">
            <button class ="btn btn-outline-info" type="submit">Enter</button>
        </div>
    </form>
</div>

Elisha Senoo · Accepted Answer · 2019-04-23 09:56:00Z

1

Yes, it is possible.

You will need to use a ModelForm with CreateView. Your SaleCreateView with SaleCreateForm classes should look like this:

class SaleCreateView(CreateView):
    model = Transaction
    fields = ['amount_sold', 'total_price_sold', 'note']
    form_class = SaleCreateForm

    def get_initial(self, *args, **kwargs):
            initial = super(SaleCreateView, self).get_initial(**kwargs)
            return initial

class SaleCreateForm(forms.ModelForm):
    class Meta:
        model = Sale
        exclude = ('transaction',)

    def __init__(self, *args, **kwargs):
        self.transaction = kwargs.pop('transaction')
        super(SaleCreateForm, self).__init__(*args, **kwargs)

Here is a step by step tutorial.

edited Apr 23, 2019 at 9:56

answered Apr 22, 2019 at 22:58

Elisha Senoo

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