Django Many-To-Many Create With Intermediary (Through) Table

child_create.html

{% extends "base.html" %}

{% block content %}
    <section title="Child Create" data-role="content">
        <h2>Child Create</h2>

        <form action="{% url child_create slug=form.family_slug.value %}" method="POST">
            {{ form.errors }}
            {% csrf_token %}
            <ul>
                {{ form.as_ul }}
            </ul>
            <input type="submit" name="Submit" value="Submit">
        </form>
    </section>
{% endblock %}

forms.py

"""Django M2M With Through Example Forms"""

from models import WeaveStep, Step, Weave
from django.forms import ModelForm, HiddenInput, IntegerField, CharField
from django.contrib.auth.models import User

class ChildEditForm(ModelForm):
    """Form to Edit a Child and Specify the Ordering and Relation to Family"""

    family_slug = CharField(widget=HiddenInput()) # Pointer Back to Family
    order = IntegerField(required=False, widget=HiddenInput(), initial=0)

    class Meta():
        model = Child
        exclude = ['families',]

    def save(self, commit=True):

        child = super(ChildEditForm, self).save() # Save the child so we have an ID for the m2m

        family_slug = self.cleaned_data.get('family_slug')
        family = Family.objects.get(slug=family_slug)
        order = self.cleaned_data.get('order')
        FamilyChild.objects.create(family=family, child=child, order=order)

        return child

models.py

"""Django M2M With Through Example Models"""

import datetime
from django.db import models

class Child(models.Model):
    """Each Child can have multiple families."""
    name = models.CharField(max_length=120)
    families = models.ManyToManyField('Parent', through='FamilyChild')

class Family(models.Model):
    """Families are groups of children in a particular order."""
    slug = models.SlugField(max_length=255)
    children = models.ManyToManyField('Child', through='FamilyChild')

class FamilyChild(models.Model):
    """A FamilyChild is the many-to-many intersection of Families and Children"""
    child = models.ForeignKey('Child', related_name='children')
    family = models.ForeignKey('Family', related_name='families')
    order = models.IntegerField(default=0)

urls.py

"""Django M2M With Through Example URLs"""

from django.conf.urls import patterns, url

from views import ChildAdd

urlpatterns = patterns('',
    # Child Create
    url(r'^family/(?P<slug>[-_\w]+)/add/child/$', ChildAdd.as_view(), name="child_create"),
)

views.py

"""Django M2M With Through Example Views"""

from django.views.generic import CreateView
from models import Child, Family
from forms import ChildEditForm

class ChildAdd(CreateView):
    """
        View to add a child to a family
        url: /family/<family-slug>/add/child
    """
    model = Child
    form_class = ChildEditForm
    context_object_name = 'child'
    template_name = 'child_create.html'

    def get_initial(self):
        """Calculate Initial Data for the form, validate ownership of family"""
        family_slug = self.kwargs.get('slug', self.request.POST.get('slug'))
        family = get_object_or_404(Family, slug=family_slug)
        
        return {'family_slug': family_slug}

am getting a Noreversematch for the url {% url child_create slug=form.family_slug.value %}"

basically i have this child_create under an app

main urls.py
url(r'^samrunbook/', include('samrunbook.urls')),

samrunbook/urls.py

url(r'sam/(?P<slug>[0-9]+)/add/account/$', views.AccountAdd.as_view(), name='account_create'),

So, if I understand correctly, account_create will be e.g sam/8/add/account, but it won't be resolved unless the urls start with

samrunbook/sam/8/add/account

Can you please help how to resolve this issue?.

Hi, I would like to know how are you using the order filed in the through table(FamilyChild).

My question and curiosity is how do we get the list of child in the order mentioned in the FamilyChild model. It would help me understand the extra filed in the model, am new to Django. Expecting something like this.
child1 = Child.create(name='first_child')
child2 = Child.create(name='second_child')
family = Family.create(name='sample_family_name')
family.children.create(child=child1, order=1)
family.children.create(child=child2, order=2)

Now?
family.childrens.order_by(:order) ===> something like. How do we do ? Am from rails background new to django.