related content

content/admin.py

@@ -69,7 +69,7 @@ class ContentAdmin(admin.ModelAdmin):
     list_filter = ['datestart', 'type']
     search_fields = ['title', 'body', 'header', 'shortname']
     raw_id_fields = ['photo']
-    inlines = [ContentParentsInline, FileInline, LinkInline]
+    inlines = [FileInline, LinkInline]
     formfield_overrides = {
         models.TextField: {'widget': MaxLengthAdminMarkdownxWidget},
     }

content/migrations/0012_content_related_content.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.8 on 2018-08-22 19:08
+from __future__ import unicode_literals
+
+from django.db import migrations
+import sortedm2m.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('content', '0011_auto_20180822_1832'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='content',
+            name='related_content',
+            field=sortedm2m.fields.SortedManyToManyField(help_text=None, to='content.Content'),
+        ),
+    ]

content/migrations/0013_related.py

@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.8 on 2018-08-22 19:08
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+def migrate_relations(apps, schema_editor):
+    Content = apps.get_model("content", "Content")
+    for c in Content.objects.all():
+        for r in c.parents.all():
+            c.related_content.add(r)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('content', '0012_content_related_content'),
+    ]
+
+    operations = [
+        migrations.RunPython(migrate_relations),
+    ]
+

content/migrations/0014_migrate_shortname.py

@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.8 on 2018-08-22 19:08
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+def migrate_shortname(apps, schema_editor):
+    Content = apps.get_model("content", "Content")
+    for c in Content.objects.filter(shortname__contains=' '):
+        c.shortname = c.shortname.replace(' ', '_')
+        c.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('content', '0013_related'),
+    ]
+
+    operations = [
+        migrations.RunPython(migrate_shortname),
+    ]
+

content/models.py

@@ -6,10 +6,14 @@ from django.core.validators import MaxLengthValidator
 from django.db import models
 from django.utils.html import mark_safe
 from django.utils.encoding import python_2_unicode_compatible
+from django.db.models.signals import m2m_changed
+from django.dispatch import receiver
+
 
 from photologue.models import Photo, Gallery
 from markdownx.models import MarkdownxField
 from markdownx.utils import markdownify
+from sortedm2m.fields import SortedManyToManyField
 import ox
 
 # Create your models here.
@@ -90,6 +94,8 @@ class Content(models.Model):
     place = models.CharField(max_length=255, null=True, blank=True)
     parents = models.ManyToManyField('Content', through='ContentContent', related_name="children")
 
+    related_content = SortedManyToManyField('Content', related_name='reverse_related_content')
+
     resources = models.ManyToManyField('Resources', through='ContentResource', related_name="content")
     gallery = models.ForeignKey(Gallery, null=True, blank=True, related_name="content")
 
@@ -170,6 +176,20 @@ class Content(models.Model):
         managed = True
         db_table = 'content'
 
+    def reverse(self):
+        ids = set(self.related_content.all().values_list('id', flat=True))
+        for r in self.reverse_related_content.exclude(id__in=ids):
+            self.reverse_related_content.remove(r)
+        reverse_ids = set(self.reverse_related_content.all().values_list('id', flat=True))
+        for r in self.related_content.filter(id__in=ids - reverse_ids):
+            self.reverse_related_content.add(r)
+
+@receiver(m2m_changed, sender='content.Content_related_content')
+def post_save_reverse(sender, **kwargs):
+    if kwargs.get('action') == 'post_add':
+        c = kwargs['instance']
+        c.reverse()
+        print(c.id, set(c.related_content.all().values_list('id', flat=True)) == set(c.reverse_related_content.all().values_list('id', flat=True)))
 
 @python_2_unicode_compatible
 class ContentContent(models.Model):

content/templates/latest_content.html

@@ -1,5 +1,5 @@
 <div class="large-4 medium-4 columns">
-    {% include "related.html" with related=content.children.all %}
+    {% include "related.html" with related=content.related_content.all %}
     {% if latest_content_list %}
     <h4 class="sidebar-h4">{{section}}</h4>
     <div class="row">