Allow tagging blog posts

project/blog/migrations/0002_auto_20180726_2038.py

@@ -0,0 +1,33 @@
+# Generated by Django 2.0.7 on 2018-07-26 20:38
+
+from django.db import migrations, models
+import django.db.models.deletion
+import modelcluster.contrib.taggit
+import modelcluster.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('taggit', '0002_auto_20150616_2121'),
+        ('blog', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='BlogPageTag',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('content_object', modelcluster.fields.ParentalKey(on_delete=django.db.models.deletion.CASCADE, related_name='tagged_items', to='blog.BlogPage')),
+                ('tag', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='blog_blogpagetag_items', to='taggit.Tag')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.AddField(
+            model_name='blogpage',
+            name='tags',
+            field=modelcluster.contrib.taggit.ClusterTaggableManager(blank=True, help_text='A comma-separated list of tags.', through='blog.BlogPageTag', to='taggit.Tag', verbose_name='Tags'),
+        ),
+    ]

project/blog/models.py

@@ -1,16 +1,32 @@
 from project.common.blocks import build_stream_field
-from wagtail.admin.edit_handlers import StreamFieldPanel
+from wagtail.admin.edit_handlers import StreamFieldPanel, FieldPanel
 from wagtail.search import index
 from project.common.models import Entity
+from django.db import models
+
+from modelcluster.fields import ParentalKey
+from modelcluster.contrib.taggit import ClusterTaggableManager
+from taggit.models import TaggedItemBase
+
+
+class BlogPageTag(TaggedItemBase):
+    content_object = ParentalKey(
+        'BlogPage',
+        related_name='tagged_items',
+        on_delete=models.CASCADE
+    )
 
 
 class BlogPage(Entity):
     body = build_stream_field()
 
+    tags = ClusterTaggableManager(through=BlogPageTag, blank=True)
+
     search_fields = Entity.search_fields + [
         index.SearchField('body'),
     ]
 
     content_panels = Entity.content_panels + [
         StreamFieldPanel('body'),
-]
+        FieldPanel('tags')
+    ]