Fixed #12168 -- Corrected the registration of m2m autocreated models when...

        'auto_created': klass,

        'unique_together': (from_, to)

    })

    # If the models have been split into subpackages, klass.__module__

    # will be the subpackge, not the models module for the app. (See #12168)

    # Compose the actual models module name by stripping the trailing parts

    # of the namespace until we find .models

    parts = klass.__module__.split('.')

    while parts[-1] != 'models':

        parts.pop()

    module = '.'.join(parts)

    # Construct and return the new class.

    return type(name, (models.Model,), {

        'Meta': meta,

        '__module__': klass.__module__,

        '__module__': module,

        from_: models.ForeignKey(klass, related_name='%s+' % name),

        to: models.ForeignKey(to_model, related_name='%s+' % name)

    })

# Import all the models from subpackages

from article import Article

from publication import Publication

from django.db import models

from django.contrib.sites.models import Site

class Article(models.Model):

    sites = models.ManyToManyField(Site)

    headline = models.CharField(max_length=100)

    publications = models.ManyToManyField("model_package.Publication", null=True, blank=True,)

    class Meta:

        app_label = 'model_package'

from django.db import models

class Publication(models.Model):

    title = models.CharField(max_length=30)

    class Meta:

        app_label = 'model_package'