Sphinx add-on to annotate Django models based on fields and their help_text.Based on https://djangosnippets.org/snippets/2533/ - but adds ForeignKey resolution, and ensure field.rel.to is an actual model instead of a string.

conf.py

import sys, os

local_path = lambda path: os.path.join(os.path.dirname(__file__), path)

os.environ['DJANGO_SETTINGS_MODULE'] = 'PROJECTNAME.settings'
sys.path.append(local_path('..'))


... # Rest of conf.py goes here

def setup(app):
    from django_sphinx import process_docstring
    # Register the docstring processor with sphinx
    app.connect('autodoc-process-docstring', process_docstring) 

django_sphinx.py

import inspect
from django.utils.html import strip_tags
from django.utils.encoding import force_text


def process_docstring(app, what, name, obj, options, lines):
    # This causes import errors if left outside the function
    from django.db import models

    # Make sure we have loaded models, otherwise related fields may end up
    # as strings
    models.get_models()

    # Only look at objects that inherit from Django's base model class
    if inspect.isclass(obj) and issubclass(obj, models.Model):
        # Grab the field list from the meta class
        fields = [x[0] for x in obj._meta.get_concrete_fields_with_model()]

        for field in fields:
            # Decode and strip any html out of the field's help text
            help_text = strip_tags(force_text(field.help_text))

            # Decode and capitalize the verbose name, for use if there isn't
            # any help text
            verbose_name = force_text(field.verbose_name).capitalize()

            if help_text:
                # Add the model field to the end of the docstring as a param
                # using the help text as the description
                lines.append(u':param %s: %s' % (field.attname, help_text))
            else:
                # Add the model field to the end of the docstring as a param
                # using the verbose name as the description
                lines.append(u':param %s: %s' % (field.attname, verbose_name))

            # Add the field's type to the docstring
            if isinstance(field, models.ForeignKey):
                to = field.rel.to
                lines.append(u':type %s: %s to :class:`~%s.%s`' % (
                field.attname, type(field).__name__, to.__module__,
                to.__name__))

            else:
                lines.append(
                    u':type %s: %s' % (field.attname, type(field).__name__))

                # Return the extended docstring
    return lines