Isolated abstract models outside of models.py

Fixes #83. Thanks Julen Ruiz Aizpuru for the report and the review.

+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.contrib.contenttypes.fields import GenericForeignKey
+from django.contrib.contenttypes.models import ContentType
+from django.contrib.sites.models import Site
+from django.core import urlresolvers
+from django.db import models
+from django.utils import timezone
+from django.utils.encoding import python_2_unicode_compatible
+from django.utils.translation import ugettext_lazy as _
+
+from .managers import CommentManager
+
+COMMENT_MAX_LENGTH = getattr(settings, 'COMMENT_MAX_LENGTH', 3000)
+
+
+class BaseCommentAbstractModel(models.Model):
+    """
+    An abstract base class that any custom comment models probably should
+    subclass.
+    """
+
+    # Content-object field
+    content_type = models.ForeignKey(ContentType,
+                                     verbose_name=_('content type'),
+                                     related_name="content_type_set_for_%(class)s",
+                                     on_delete=models.CASCADE)
+    object_pk = models.TextField(_('object ID'))
+    content_object = GenericForeignKey(ct_field="content_type", fk_field="object_pk")
+
+    # Metadata about the comment
+    site = models.ForeignKey(Site, on_delete=models.CASCADE)
+
+    class Meta:
+        abstract = True
+
+    def get_content_object_url(self):
+        """
+        Get a URL suitable for redirecting to the content object.
+        """
+        return urlresolvers.reverse(
+            "comments-url-redirect",
+            args=(self.content_type_id, self.object_pk)
+        )
+
+
+@python_2_unicode_compatible
+class CommentAbstractModel(BaseCommentAbstractModel):
+    """
+    A user comment about some object.
+    """
+
+    # Who posted this comment? If ``user`` is set then it was an authenticated
+    # user; otherwise at least user_name should have been set and the comment
+    # was posted by a non-authenticated user.
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, verbose_name=_('user'),
+                             blank=True, null=True, related_name="%(class)s_comments",
+                             on_delete=models.SET_NULL)
+    user_name = models.CharField(_("user's name"), max_length=50, blank=True)
+    # Explicit `max_length` to apply both to Django 1.7 and 1.8+.
+    user_email = models.EmailField(_("user's email address"), max_length=254,
+                                   blank=True)
+    user_url = models.URLField(_("user's URL"), blank=True)
+
+    comment = models.TextField(_('comment'), max_length=COMMENT_MAX_LENGTH)
+
+    # Metadata about the comment
+    submit_date = models.DateTimeField(_('date/time submitted'), default=None, db_index=True)
+    ip_address = models.GenericIPAddressField(_('IP address'), unpack_ipv4=True, blank=True, null=True)
+    is_public = models.BooleanField(_('is public'), default=True,
+                                    help_text=_('Uncheck this box to make the comment effectively '
+                                                'disappear from the site.'))
+    is_removed = models.BooleanField(_('is removed'), default=False,
+                                     help_text=_('Check this box if the comment is inappropriate. '
+                                                 'A "This comment has been removed" message will '
+                                                 'be displayed instead.'))
+
+    # Manager
+    objects = CommentManager()
+
+    class Meta:
+        abstract = True
+        ordering = ('submit_date',)
+        permissions = [("can_moderate", "Can moderate comments")]
+        verbose_name = _('comment')
+        verbose_name_plural = _('comments')
+
+    def __str__(self):
+        return "%s: %s..." % (self.name, self.comment[:50])
+
+    def save(self, *args, **kwargs):
+        if self.submit_date is None:
+            self.submit_date = timezone.now()
+        super(CommentAbstractModel, self).save(*args, **kwargs)
+
+    def _get_userinfo(self):
+        """
+        Get a dictionary that pulls together information about the poster
+        safely for both authenticated and non-authenticated comments.
+
+        This dict will have ``name``, ``email``, and ``url`` fields.
+        """
+        if not hasattr(self, "_userinfo"):
+            userinfo = {
+                "name": self.user_name,
+                "email": self.user_email,
+                "url": self.user_url
+            }
+            if self.user_id:
+                u = self.user
+                if u.email:
+                    userinfo["email"] = u.email
+
+                # If the user has a full name, use that for the user name.
+                # However, a given user_name overrides the raw user.username,
+                # so only use that if this comment has no associated name.
+                if u.get_full_name():
+                    userinfo["name"] = self.user.get_full_name()
+                elif not self.user_name:
+                    userinfo["name"] = u.get_username()
+            self._userinfo = userinfo
+        return self._userinfo
+
+    userinfo = property(_get_userinfo, doc=_get_userinfo.__doc__)
+
+    def _get_name(self):
+        return self.userinfo["name"]
+
+    def _set_name(self, val):
+        if self.user_id:
+            raise AttributeError(_("This comment was posted by an authenticated "
+                                   "user and thus the name is read-only."))
+        self.user_name = val
+
+    name = property(_get_name, _set_name, doc="The name of the user who posted this comment")
+
+    def _get_email(self):
+        return self.userinfo["email"]
+
+    def _set_email(self, val):
+        if self.user_id:
+            raise AttributeError(_("This comment was posted by an authenticated "
+                                   "user and thus the email is read-only."))
+        self.user_email = val
+
+    email = property(_get_email, _set_email, doc="The email of the user who posted this comment")
+
+    def _get_url(self):
+        return self.userinfo["url"]
+
+    def _set_url(self, val):
+        self.user_url = val
+
+    url = property(_get_url, _set_url, doc="The URL given by the user who posted this comment")
+
+    def get_absolute_url(self, anchor_pattern="#c%(id)s"):
+        return self.get_content_object_url() + (anchor_pattern % self.__dict__)
+
+    def get_as_text(self):
+        """
+        Return this comment as plain text.  Useful for emails.
+        """
+        d = {
+            'user': self.user or self.name,
+            'date': self.submit_date,
+            'comment': self.comment,
+            'domain': self.site.domain,
+            'url': self.get_absolute_url()
+        }
+        return _('Posted by %(user)s at %(date)s\n\n%(comment)s\n\nhttp://%(domain)s%(url)s') % d

 from django.conf import settings
-from django.contrib.contenttypes.fields import GenericForeignKey
-from django.contrib.contenttypes.models import ContentType
-from django.contrib.sites.models import Site
-from django.core import urlresolvers
 from django.db import models
-from django.utils.translation import ugettext_lazy as _
 from django.utils import timezone
 from django.utils.encoding import python_2_unicode_compatible
+from django.utils.translation import ugettext_lazy as _
 
-from django_comments.managers import CommentManager
-
-COMMENT_MAX_LENGTH = getattr(settings, 'COMMENT_MAX_LENGTH', 3000)
-
-
-class BaseCommentAbstractModel(models.Model):
-    """
-    An abstract base class that any custom comment models probably should
-    subclass.
-    """
-
-    # Content-object field
-    content_type = models.ForeignKey(ContentType,
-                                     verbose_name=_('content type'),
-                                     related_name="content_type_set_for_%(class)s",
-                                     on_delete=models.CASCADE)
-    object_pk = models.TextField(_('object ID'))
-    content_object = GenericForeignKey(ct_field="content_type", fk_field="object_pk")
-
-    # Metadata about the comment
-    site = models.ForeignKey(Site, on_delete=models.CASCADE)
-
-    class Meta:
-        abstract = True
-
-    def get_content_object_url(self):
-        """
-        Get a URL suitable for redirecting to the content object.
-        """
-        return urlresolvers.reverse(
-            "comments-url-redirect",
-            args=(self.content_type_id, self.object_pk)
-        )
-
-
-@python_2_unicode_compatible
-class CommentAbstractModel(BaseCommentAbstractModel):
-    """
-    A user comment about some object.
-    """
-
-    # Who posted this comment? If ``user`` is set then it was an authenticated
-    # user; otherwise at least user_name should have been set and the comment
-    # was posted by a non-authenticated user.
-    user = models.ForeignKey(settings.AUTH_USER_MODEL, verbose_name=_('user'),
-                             blank=True, null=True, related_name="%(class)s_comments",
-                             on_delete=models.SET_NULL)
-    user_name = models.CharField(_("user's name"), max_length=50, blank=True)
-    # Explicit `max_length` to apply both to Django 1.7 and 1.8+.
-    user_email = models.EmailField(_("user's email address"), max_length=254,
-                                   blank=True)
-    user_url = models.URLField(_("user's URL"), blank=True)
-
-    comment = models.TextField(_('comment'), max_length=COMMENT_MAX_LENGTH)
-
-    # Metadata about the comment
-    submit_date = models.DateTimeField(_('date/time submitted'), default=None, db_index=True)
-    ip_address = models.GenericIPAddressField(_('IP address'), unpack_ipv4=True, blank=True, null=True)
-    is_public = models.BooleanField(_('is public'), default=True,
-                                    help_text=_('Uncheck this box to make the comment effectively '
-                                                'disappear from the site.'))
-    is_removed = models.BooleanField(_('is removed'), default=False,
-                                     help_text=_('Check this box if the comment is inappropriate. '
-                                                 'A "This comment has been removed" message will '
-                                                 'be displayed instead.'))
-
-    # Manager
-    objects = CommentManager()
-
-    class Meta:
-        abstract = True
-        ordering = ('submit_date',)
-        permissions = [("can_moderate", "Can moderate comments")]
-        verbose_name = _('comment')
-        verbose_name_plural = _('comments')
-
-    def __str__(self):
-        return "%s: %s..." % (self.name, self.comment[:50])
-
-    def save(self, *args, **kwargs):
-        if self.submit_date is None:
-            self.submit_date = timezone.now()
-        super(CommentAbstractModel, self).save(*args, **kwargs)
-
-    def _get_userinfo(self):
-        """
-        Get a dictionary that pulls together information about the poster
-        safely for both authenticated and non-authenticated comments.
-
-        This dict will have ``name``, ``email``, and ``url`` fields.
-        """
-        if not hasattr(self, "_userinfo"):
-            userinfo = {
-                "name": self.user_name,
-                "email": self.user_email,
-                "url": self.user_url
-            }
-            if self.user_id:
-                u = self.user
-                if u.email:
-                    userinfo["email"] = u.email
-
-                # If the user has a full name, use that for the user name.
-                # However, a given user_name overrides the raw user.username,
-                # so only use that if this comment has no associated name.
-                if u.get_full_name():
-                    userinfo["name"] = self.user.get_full_name()
-                elif not self.user_name:
-                    userinfo["name"] = u.get_username()
-            self._userinfo = userinfo
-        return self._userinfo
-
-    userinfo = property(_get_userinfo, doc=_get_userinfo.__doc__)
-
-    def _get_name(self):
-        return self.userinfo["name"]
-
-    def _set_name(self, val):
-        if self.user_id:
-            raise AttributeError(_("This comment was posted by an authenticated "
-                                   "user and thus the name is read-only."))
-        self.user_name = val
-
-    name = property(_get_name, _set_name, doc="The name of the user who posted this comment")
-
-    def _get_email(self):
-        return self.userinfo["email"]
-
-    def _set_email(self, val):
-        if self.user_id:
-            raise AttributeError(_("This comment was posted by an authenticated "
-                                   "user and thus the email is read-only."))
-        self.user_email = val
-
-    email = property(_get_email, _set_email, doc="The email of the user who posted this comment")
-
-    def _get_url(self):
-        return self.userinfo["url"]
-
-    def _set_url(self, val):
-        self.user_url = val
-
-    url = property(_get_url, _set_url, doc="The URL given by the user who posted this comment")
-
-    def get_absolute_url(self, anchor_pattern="#c%(id)s"):
-        return self.get_content_object_url() + (anchor_pattern % self.__dict__)
-
-    def get_as_text(self):
-        """
-        Return this comment as plain text.  Useful for emails.
-        """
-        d = {
-            'user': self.user or self.name,
-            'date': self.submit_date,
-            'comment': self.comment,
-            'domain': self.site.domain,
-            'url': self.get_absolute_url()
-        }
-        return _('Posted by %(user)s at %(date)s\n\n%(comment)s\n\nhttp://%(domain)s%(url)s') % d
+from .abstracts import (
+    COMMENT_MAX_LENGTH, BaseCommentAbstractModel, CommentAbstractModel,
+)
 
 
 class Comment(CommentAbstractModel):

@@ -61,16 +61,16 @@ the ``my_comment_app`` directory::
 In the ``models.py`` we'll define a ``CommentWithTitle`` model::
 
     from django.db import models
-    from django_comments.models import CommentAbstractModel
+    from django_comments.abstracts import CommentAbstractModel
 
     class CommentWithTitle(CommentAbstractModel):
         title = models.CharField(max_length=300)
 
 Most custom comment models will subclass the
-:class:`~django_comments.models.CommentAbstractModel` model. However,
+:class:`~django_comments.abstracts.CommentAbstractModel` model. However,
 if you want to substantially remove or change the fields available in the
-:class:`~django_comments.models.CommentAbstractModel` model, but don't want to
-rewrite the templates, you could try subclassing from
+:class:`~django_comments.abstracts.CommentAbstractModel` model, but don't want
+to rewrite the templates, you could try subclassing from
 ``BaseCommentAbstractModel``.
 
 Next, we'll define a custom comment form in ``forms.py``. This is a little more
@@ -137,7 +137,7 @@ however.
 
     Return the :class:`~django.db.models.Model` class to use for comments. This
     model should inherit from
-    ``django_comments.models.BaseCommentAbstractModel``, which
+    ``django_comments.abstracts.BaseCommentAbstractModel``, which
     defines necessary core fields.
 
     The default implementation returns