Auto list fields from django models.py

# Auto list fields from django models - from https://djangosnippets.org/snippets/2533/#c5977
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

    # 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 = obj._meta.get_fields()

        for field in fields:
            # Skip ManyToOneRel and ManyToManyRel fields which have no 'verbose_name' or 'help_text'
            if not hasattr(field, 'verbose_name'):
                continue

            # 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

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

# END Auto list fields from django models -

Thank you so much!

In Django 2.0.2 got an error in line 39
to = field.rel.to
and changed it to:
to = field.related_model

Thank so much all !

This still works for 3.2.6, after chaing to = field.rel.to to to = field.related_model