Create Django Admin Intermediate page

Question

I need a way to have an intermediate page shown when I´ve saved a model in django admin.

What I want to accomplish is after "saving" a model, show a page with all the attributes of the model lined up and then have a button that says Print. I used to solve this with Jquery dialog div when clicking save. That meant that I showed the settings print view before actually saving the model but I need the model to validate first now.

Its like the way that the "delete model" action is implemented. I just can´t seem to find out where to start looking though.

Edit: I´ve started looking in the django.contrib.admin.options.py for the response_change and response_add methods. Not sure how to override them though. And its only needed for one specific model so its not generic. Also I´ve discovered the list of templates in the Class ModelAdmin. Still not sure about how to proceed without hacking the admin to bits.

Edit 2: Added my working solution down below.

Answer 1

You could create a form that had an extra step of validation for the 'are you sure' step.

Given this model in our models.py:

from django.db import models

class Person(models.Model):
    name = models.CharField(max_length=100)

Add a form in forms.py:

from django import forms
from .models import Person

class PersonForm(forms.ModelForm):
    i_am_sure = forms.BooleanField(required=False, widget=forms.HiddenInput())

    def __init__(self, *args, **kwargs):
        super(PersonForm, self).__init__(*args, **kwargs)

        if self.errors.get('i_am_sure'):
            # show the 'are you sure' checkbox when we want confirmation
            self.fields['i_am_sure'].widget = forms.CheckboxInput()

    def clean(self):
        cleaned_data = super(PersonForm, self).clean()

        if not self.errors:
            # only validate i_am_sure once all other validation has passed
            i_am_sure = cleaned_data.get('i_am_sure')
            if self.instance.id and not i_am_sure:
                self._errors['i_am_sure'] = self.error_class(["Are you sure you want to change this person?"])
                del cleaned_data['i_am_sure']

        return cleaned_data

    class Meta:
        model = Person

If you want to use this with Django admin. specify this form in your admin.py:

from django.contrib import admin
from .forms import PersonForm
from .models import Person

class PersonAdmin(admin.ModelAdmin):
    form = PersonForm

admin.site.register(Person, PersonAdmin)

Note however that there's a bug with hidden inputs on Django admin forms. There's a solution to that on this Stack Overflow question.