From 2c7b7a116ebce28ca62052456e8eaae5176e1786 Mon Sep 17 00:00:00 2001
From: Jan Szejko <janek37@gmail.com>
Date: Thu, 29 Jun 2017 12:30:01 +0200
Subject: [PATCH] simplify TagRelation maybe it will fix unresolved keyword
 items

---
 src/catalogue/models/tag.py | 27 +++++++++++++++++++++++----
 src/newtagging/models.py    | 34 +---------------------------------
 2 files changed, 24 insertions(+), 37 deletions(-)

diff --git a/src/catalogue/models/tag.py b/src/catalogue/models/tag.py
index 00bdcb55b..828a8b191 100644
--- a/src/catalogue/models/tag.py
+++ b/src/catalogue/models/tag.py
@@ -3,8 +3,11 @@
 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
 #
 from django.conf import settings
+from django.contrib.contenttypes.fields import GenericForeignKey
+from django.contrib.contenttypes.models import ContentType
 from django.core.cache import caches
 from django.contrib.auth.models import User
+from django.core.exceptions import ObjectDoesNotExist
 from django.db import models
 from django.db.models import permalink
 from django.db.models.query import Prefetch
@@ -27,6 +30,24 @@ TAG_CATEGORIES = (
 )
 
 
+class TagRelation(models.Model):
+
+    tag = models.ForeignKey('Tag', verbose_name=_('tag'), related_name='items')
+    content_type = models.ForeignKey(ContentType, verbose_name=_('content type'))
+    object_id = models.PositiveIntegerField(_('object id'), db_index=True)
+    content_object = GenericForeignKey('content_type', 'object_id')
+
+    class Meta:
+        db_table = 'catalogue_tag_relation'
+        unique_together = (('tag', 'content_type', 'object_id'),)
+
+    def __unicode__(self):
+        try:
+            return u'%s [%s]' % (self.content_type.get_object_for_this_type(pk=self.object_id), self.tag)
+        except ObjectDoesNotExist:
+            return u'<deleted> [%s]' % self.tag
+
+
 class Tag(TagBase):
     """A tag attachable to books and fragments (and possibly anything).
 
@@ -49,6 +70,8 @@ class Tag(TagBase):
 
     after_change = Signal(providing_args=['instance', 'languages'])
 
+    intermediary_table_model = TagRelation
+
     class UrlDeprecationWarning(DeprecationWarning):
         def __init__(self, tags=None):
             super(Tag.UrlDeprecationWarning, self).__init__()
@@ -245,10 +268,6 @@ class Tag(TagBase):
         return meta_tags
 
 
-# Pickle complains about not having this.
-TagRelation = Tag.intermediary_table_model
-
-
 def prefetch_relations(objects, category, only_name=True):
     queryset = TagRelation.objects.filter(tag__category=category).select_related('tag')
     if only_name:
diff --git a/src/newtagging/models.py b/src/newtagging/models.py
index 1d1b22185..83aabe4fc 100644
--- a/src/newtagging/models.py
+++ b/src/newtagging/models.py
@@ -3,12 +3,9 @@
 Models and managers for generic tagging.
 """
 
-from django.contrib.contenttypes.fields import GenericForeignKey
 from django.contrib.contenttypes.models import ContentType
 from django.db import connection, models
-from django.utils.translation import ugettext_lazy as _
 from django.db.models.base import ModelBase
-from django.core.exceptions import ObjectDoesNotExist
 from django.dispatch import Signal
 
 qn = connection.ops.quote_name
@@ -197,42 +194,13 @@ class TaggedItemManager(models.Manager):
 ##########
 # Models #
 ##########
-def create_intermediary_table_model(model):
-    """Create an intermediary table model for the specific tag model"""
-    name = model.__name__ + 'Relation'
-
-    class Meta:
-        db_table = '%s_relation' % model._meta.db_table
-        unique_together = (('tag', 'content_type', 'object_id'),)
-        app_label = model._meta.app_label
-
-    def obj_unicode(self):
-        try:
-            return u'%s [%s]' % (self.content_type.get_object_for_this_type(pk=self.object_id), self.tag)
-        except ObjectDoesNotExist:
-            return u'<deleted> [%s]' % self.tag
-
-    # Set up a dictionary to simulate declarations within a class
-    attrs = {
-        '__module__': model.__module__,
-        'Meta': Meta,
-        'tag': models.ForeignKey(model, verbose_name=_('tag'), related_name='items'),
-        'content_type': models.ForeignKey(ContentType, verbose_name=_('content type')),
-        'object_id': models.PositiveIntegerField(_('object id'), db_index=True),
-        'content_object': GenericForeignKey('content_type', 'object_id'),
-        '__unicode__': obj_unicode,
-    }
-
-    return type(name, (models.Model,), attrs)
-
 
 class TagMeta(ModelBase):
     """Metaclass for tag models (models inheriting from TagBase)."""
     def __new__(mcs, name, bases, attrs):
         model = super(TagMeta, mcs).__new__(mcs, name, bases, attrs)
         if not model._meta.abstract:
-            # Create an intermediary table and register custom managers for concrete models
-            model.intermediary_table_model = create_intermediary_table_model(model)
+            # Register custom managers for concrete models
             TagManager(model.intermediary_table_model).contribute_to_class(model, 'objects')
             TaggedItemManager(model).contribute_to_class(model.intermediary_table_model, 'objects')
         return model
-- 
2.20.1