https://github.com/primal100/django_postgres_extensions/archive/master.zip#egg=django_postgres_extensions==0.9

----------------------------------------

root@4ae4fe029e54:/app# ./manage.py makemigrations
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/django/db/utils.py", line 115, in load_backend
    return import_module('%s.base' % backend_name)
  File "/usr/local/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 978, in _gcd_import
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load
  File "<frozen importlib._bootstrap>", line 950, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 205, in _call_with_frames_removed
  File "/usr/local/lib/python3.6/site-packages/django_postgres_extensions/backends/postgresql/base.py", line 3, in <module>
    from .creation import DatabaseCreation
  File "/usr/local/lib/python3.6/site-packages/django_postgres_extensions/backends/postgresql/creation.py", line 1, in <module>
    from django.contrib.postgres.signals import register_hstore_handler
ImportError: cannot import name 'register_hstore_handler'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python3.6/site-packages/django/core/management/__init__.py", line 364, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python3.6/site-packages/django/core/management/__init__.py", line 338, in execute
    django.setup()
  File "/usr/local/lib/python3.6/site-packages/django/__init__.py", line 27, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/usr/local/lib/python3.6/site-packages/django/apps/registry.py", line 108, in populate
    app_config.import_models()
  File "/usr/local/lib/python3.6/site-packages/django/apps/config.py", line 202, in import_models
    self.models_module = import_module(models_module_name)
  File "/usr/local/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 978, in _gcd_import
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load
  File "<frozen importlib._bootstrap>", line 950, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 205, in _call_with_frames_removed
  File "/usr/local/lib/python3.6/site-packages/django/contrib/sessions/models.py", line 3, in <module>
    from django.contrib.sessions.base_session import (
  File "/usr/local/lib/python3.6/site-packages/django/contrib/sessions/base_session.py", line 30, in <module>
    class AbstractBaseSession(models.Model):
  File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py", line 124, in __new__
    new_class.add_to_class('_meta', Options(meta, app_label))
  File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py", line 325, in add_to_class
    value.contribute_to_class(cls, name)
  File "/usr/local/lib/python3.6/site-packages/django/db/models/options.py", line 214, in contribute_to_class
    self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
  File "/usr/local/lib/python3.6/site-packages/django/db/__init__.py", line 33, in __getattr__
    return getattr(connections[DEFAULT_DB_ALIAS], item)
  File "/usr/local/lib/python3.6/site-packages/django/db/utils.py", line 211, in __getitem__
    backend = load_backend(db['ENGINE'])
  File "/usr/local/lib/python3.6/site-packages/django/db/utils.py", line 134, in load_backend
    raise ImproperlyConfigured(error_msg)
django.core.exceptions.ImproperlyConfigured: 'django_postgres_extensions.backends.postgresql' isn't an available database backend.
Try using 'django.db.backends.XXX', where XXX is one of:
    'mysql', 'oracle', 'postgresql', 'sqlite3'
Error was: cannot import name 'register_hstore_handler'

class Publication(models.Model):
    title = models.CharField(max_length=30)

    def __str__(self):
        return self.title

    class Meta:
        ordering = ('title',)

class Article(models.Model):
    headline = models.CharField(max_length=100)
    publications = ArrayManyToManyField(Publication, name='publications')
 
    def __str__(self):
        return self.headline

    class Meta:
        ordering = ('headline',)