Add to installed apps

INSTALLED_APPS = (
    ...
    formfield,
    ...
)

Example

from django.db import models
from django import forms

from formfield import ModelFormField

class PersonMetaForm(forms.Form):
    age = forms.IntegerField()
    sex = forms.ChoiceField(choices=((1, 'male'), (2, 'female')), required=False)


class Person(models.Model):
    name = CharField(max_length=200)

    meta_info = ModelFormField(PersonMetaForm)

Which will result in something like this (using the admin)

The ModelFormField is automatically set to null=False, blank=False, this is because validation is done on the inner form. As a result you will see something like the following if we hit save on the change form:

If we supply the change for valid data you should get a python dictionary when retrieving the data:

>>> person = Person.objects.get(pk=1)
>>> person.meta_info
{u'age': 12, u'sex': u'1'}

The form is the only thing forcing input of the expected values, behind the scenes the data is being serialized into json. Therefore on the python level we can supply meta_info any valid json::

>>> from sample_app.models import Person
>>> data = {'some': 'thing', 'is': 'wrong', 'here': 'help!'}
>>> p = Person.objects.create(name="Joan", meta_info=data)
>>> p.meta_info
{'is': 'wrong', 'some': 'thing', 'here': 'help!'}

Form within a form within a form within a form within a form.....

Sure its possible..