django-contracts 0.4.5

A lightweight API validation library built on top of Django forms.

Django Contracts

This is a lightweight (and hopefully minimally opinionated) library that exists to make it easier to apply Django Forms to your views. If you need more complex capabilities than what Django Forms offers then you might want to consider something like Django REST Framework.

Basic Usage

from django_contracts.contracts import apply_contract


@apply_contract(request_contracts={'POST': MyRequestForm}, response_contracts={'POST': MyResponseForm})
def my_view(request):
    # If you get here then the request matched your contract
    data = request.validated_data

    # ... do something with the data

You can also supply a function which returns a Django Form class to use as a contract. This is helpful if you need a form to be specific to a user.

from django import forms
from django_contracts.contracts import request_contract

def create_form_for_user(user, data):
    class MyUserForm(forms.Form):
        # ... 
        if user_can_do_thing:
            my_field = ...

    return MyUserForm(data)


@apply_contract(request_contracts={'POST': create_form_for_user}, pass_in_user=True)
def my_view(request):
    # ... 

Or if you prefer to override init on the form:

from django import forms
from django_contracts.contracts import apply

class MyUserForm(forms.Form):
    def __init__(self, user, *args, **kwargs):
        super(*args, **kwargs)
        self.user = user

@apply_contract(request_contracts={'POST': create_form_for_user}, pass_in_user=True)
def my_view(request)
    # ...

Using forms that take a User can be useful for filtering choice options.