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Showing content from https://django-classifier.readthedocs.io/en/latest/tutorial.html below:

Tutorial — django-classifier 0.2.2.1 documentation

Simplest way:

pip install django-classifier

see more at Installation.

Add classifier to INSTALLED_APPS in your setting.py file:

INSTALLED_APPS = (
    'django.contrib.auth',
    # ...
    'classifier',
)

You need to create two models for classifier structure and one for data.

First it’s basic model without extra data inherited from ClassifierAbstract:

from classifier.models import ClassifierAbstract

class ContactClassifier(ClassifierAbstract):
    pass

Second model must contain ForeignKey to model that we created before and inherited from ClassifierLabelAbstract:

from classifier.models import ClassifierLabelAbstract

class ContactClassifierLabel(ClassifierLabelAbstract):
    classifier = models.ForeignKey(ContactClassifier, related_name='labels')

Model for data pretty simple in general: ForeignKey to label model (ContactClassifierLabel in tutorial) and CharField for value:

from django.conf import settings
from django.db import models

class Contact(models.Model):
    user = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        related_name='contacts'
    )
    kind = models.ForeignKey(ContactClassifier)
    value = models.CharField(max_length=500)

Then make and run migrations and you are ready to use django-classifier:

python manage.py makemigrations
python manage.py migrate

Lets add some data to ContactClassifier and ContactClassifierLabel:

contact_classifier1 = ContactClassifier.objects.create(
    kind='phone',
    value_type=ContactClassifier.TYPES.STRING,
    value_validator=r'^\+\d{12}$',
    only_one_required=False,
)
contact_classifier1.labels.create(label='Mobile')
contact_classifier1.labels.create(label='Work')
contact_classifier1.labels.create(label='Home')

contact_classifier2 = ContactClassifier.objects.create(
    kind='im',
    value_type=ContactClassifier.TYPES.STRING,
    value_validator=None,
    only_one_required=False,
)
contact_classifier2.labels.create(label='Skype')
contact_classifier2.labels.create(label='Jabber')

To validate values based on classifier record, for this django-classifier has ClassifierFormMixin:

from django import forms
from classifier.forms import ClassifierFormMixin
from .models import Contact

class ContactForm(ClassifierFormMixin, forms.ModelForm):
    CLASSIFIER_VALUE_FIELD = 'value'

    class Meta:
        model = Contact
        fields = ('user', 'kind', 'value', )

You have to specify CLASSIFIER_VALUE_FIELD attribute to identify name of value field to attach validation based on classifier record.

classifier provide own FormSet class ClassifierFormSet that will add extra forms for mandatory records and validate if all of them are filled in:

from django.contrib.auth import get_user_model
from django.forms import modelformset_factory
from classifier.formsets import ClassifierFormSet
from .forms import UserForm, ContactForm
from .models import Contact

ContactFormSet = modelformset_factory(
    Contact,
    formset=ClassifierFormSet,
    form=ContactForm
)

user = get_user_model().objects.create('login', 'password')
contact_formset = ContactFormSet(queryset=user.contacts.all())

print(len(contact_formset.forms))
print(contact_formset.forms[0].initial)

For now any of classifier records are not marked as required and formset has only one blank forms as default in Django.

But if you will mark both classifiers as only_one_required you will have two forms with prepopulated labels (first available label):

ContactClassifier.objects.all().update(only_one_required=True)

contact_formset = ContactFormSet(queryset=user.contacts.all())
print(len(contact_formset.forms))
print(contact_formset.forms[0].initial)
print(contact_formset.forms[1].initial)

If you will mark all labels as required then you will have 5 forms by default and all of them will be required:

ContactClassifier.objects.all().update(only_one_required=False)
ContactClassifierLabel.objects.all().update(required=True)

contact_formset = ContactFormSet(queryset=user.contacts.all())
print(len(contact_formset.forms))

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