Save multiple models in one form with Django

There is a space in the Advent calendar, so ...

• Django 1.10.4
• Python 3.5.2

Content of this article

Form-related APIs are relatively generous in Django, but when you try to edit multiple models in one form, it suddenly becomes troublesome.

So, I will be able to do things quickly while using the module.

It's like a continuation of the previous article.

Module to install

django-extra-views

pip install django-extra-views

How to use

That's because django extra views can be done without using a form class.

CreateView

model

models.py

from django.db import models


class Person(models.Model):

    name = models.CharField(max_length=255)
    age = models.IntegerField(default=25) #I want to go back to 25


class Car(models.Model):

    owner = models.ForeignKey(Person)
    color = models.CharField(max_length=10)

views.py

views.py

from extra_views import CreateWithInlinesView, InlineFormSet


class CarInlineFormSet(InlineFormSet):
    model = Car
    fields = ("color", )
    can_delete = False  #No need to delete in create view


class PersonCarCreateFormsetView(CreateWithInlinesView):
    model = Person
    fields = ("name", "age")  # self.model fields
    inlines = [CarInlineFormSet, ]
    template_name = "person_formset.html"
    success_url = "/"

template

person_formset.html

{% extends "base.html" %}

{% block content %}

    <form method="post">
        {% csrf_token %}
        <table>
            {{ form.as_table }}
        </table>

　　　　　　　　　　　　　　　 {#Inline is listed in a variable called inlines#}
        <p>Car Color</p>
        <table>
            {% for form in inlines %}
                {{ form.as_table }}
            {% endfor %}
        </table>
        <button type="submit">save</button>
    </form>

{% endblock %}

UpdateView

model

the same

views.py

views.py

from extra_views import InlineFormSet, UpdateWithInlinesView

class CarInlineFormSetCanDelete(InlineFormSet):
    model = Car
    fields = ("color", )
    can_delete = True

class PersonCarUpdateFormsetView(UpdateWithInlinesView):
    model = Person
    fields = ("name", "age")
    inlines = [CarInlineFormSetCanDelete, ]
    template_name = "person_formset.html"
    success_url = "/"

template

the same

Summary

Very convenient.

Postscript 2017-09-27

How to display other than as_table

If you write it normally, you will want to write the inline one like table.name.

I was a little addicted to it

template.html

{% for inline in inlines %}
  {% for line in inline %}
     {{ line.name }}
  {% endfor %}
{% endfor %}

You can do a double loop like this. This is probably because multiple inline models are set in ʻinlines`.

Postscript up to here