Replace keywords by a Tag model

articles/admin.py

@@ -1,11 +1,9 @@
-import copy
-
 from django.contrib import admin, messages
 from django.contrib.admin import register
 from django.contrib.auth.admin import UserAdmin
 from django.shortcuts import redirect
 
-from .models import Article, User
+from .models import Article, Tag, User
 
 admin.site.register(User, UserAdmin)
 
@@ -40,7 +38,7 @@ class ArticleAdmin(admin.ModelAdmin):
             {
                 "fields": [
                     ("title", "slug"),
-                    ("author", "keywords"),
+                    ("author", "tags"),
                     ("status", "published_at"),
                     ("created_at", "updated_at"),
                     ("views_count", "read_time"),
@@ -71,7 +69,8 @@ class ArticleAdmin(admin.ModelAdmin):
     ]
     prepopulated_fields = {"slug": ("title",)}
     change_form_template = "articles/article_change_form.html"
-    search_fields = ["title", "content"]
+    search_fields = ["title", "content", "tags__name"]
+    autocomplete_fields = ["tags"]
 
     def publish(self, request, queryset):
         if not request.user.has_perm("articles.change_article"):
@@ -133,3 +132,9 @@ class ArticleAdmin(admin.ModelAdmin):
         return bool(instance.custom_css)
 
     has_custom_css.boolean = True
+
+
+@register(Tag)
+class TagAdmin(admin.ModelAdmin):
+    list_display = ["name"]
+    search_fields = ["name"]

articles/migrations/0027_auto_20210303_1633.py

@@ -0,0 +1,62 @@
+# Generated by Django 3.1.5 on 2021-03-03 15:33
+
+from django.db import migrations, models
+
+
+def forwards(apps, schema_editor):
+    Tag = apps.get_model("articles", "Tag")
+    Article = apps.get_model("articles", "Article")
+    db_alias = schema_editor.connection.alias
+    articles = Article.objects.using(db_alias).all()
+    for article in articles:
+        tags = []
+        for keyword in list(
+            filter(None, map(lambda k: k.strip(), article.keywords.split(",")))
+        ):
+            tag = Tag.objects.using(db_alias).filter(name__iexact=keyword).first()
+            if tag is None:
+                tag = Tag.objects.create(name=keyword)
+            tags.append(tag)
+        article.tags.set(tags)
+        article.keywords = ""
+    Article.objects.bulk_update(articles, ["keywords"])
+
+
+def backwards(apps, schema_editor):
+    Article = apps.get_model("articles", "Article")
+    db_alias = schema_editor.connection.alias
+    articles = Article.objects.using(db_alias).all()
+    for article in articles:
+        article.keywords = ",".join(map(lambda tag: tag.name, article.tags.all()))
+    Article.objects.bulk_update(articles, ["keywords"])
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("articles", "0026_article_draft_key"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="Tag",
+            fields=[
+                (
+                    "id",
+                    models.AutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("name", models.CharField(max_length=255, unique=True)),
+            ],
+        ),
+        migrations.AddField(
+            model_name="article",
+            name="tags",
+            field=models.ManyToManyField(related_name="articles", to="articles.Tag"),
+        ),
+        migrations.RunPython(forwards, backwards),
+    ]

articles/migrations/0028_remove_article_keywords.py

@@ -0,0 +1,17 @@
+# Generated by Django 3.1.5 on 2021-03-03 15:52
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("articles", "0027_auto_20210303_1633"),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name="article",
+            name="keywords",
+        ),
+    ]

articles/migrations/0029_auto_20210303_1711.py

@@ -0,0 +1,17 @@
+# Generated by Django 3.1.5 on 2021-03-03 16:11
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("articles", "0028_remove_article_keywords"),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name="tag",
+            options={"ordering": ["name"]},
+        ),
+    ]

articles/models.py

@@ -23,6 +23,16 @@ class User(AbstractUser):
     pass
 
 
+class Tag(models.Model):
+    name = models.CharField(max_length=255, unique=True)
+
+    class Meta:
+        ordering = ["name"]
+
+    def __str__(self):
+        return self.name
+
+
 class Article(models.Model):
     DRAFT = "draft"
     PUBLISHED = "published"
@@ -39,11 +49,11 @@ class Article(models.Model):
     author = models.ForeignKey(User, on_delete=models.PROTECT, default=1)
     views_count = models.IntegerField(default=0)
     slug = models.SlugField(unique=True, max_length=255)
-    keywords = models.CharField(max_length=255, blank=True)
     has_code = models.BooleanField(default=False, blank=True)
     is_home = models.BooleanField(default=False, blank=True)
     custom_css = models.TextField(blank=True)
     draft_key = models.UUIDField(default=uuid.uuid4)
+    tags = models.ManyToManyField(to=Tag, related_name="articles")
 
     class Meta:
         ordering = ["-published_at"]
@@ -105,22 +115,14 @@ class Article(models.Model):
     @cached_property
     def get_related_articles(self):
         related_articles = set()
-        for keyword in self.get_formatted_keywords:
-            potential_articles = Article.objects.filter(
-                keywords__icontains=keyword,
-                status=Article.PUBLISHED,
-            ).exclude(pk=self.pk)
-            for article in potential_articles:
-                if keyword in article.get_formatted_keywords:
-                    related_articles.add(article)
+        for tag in self.tags.all():
+            related_articles.update(tag.articles.all())
         sample_size = min([len(related_articles), 3])
         return random.sample(related_articles, sample_size)
 
     @cached_property
-    def get_formatted_keywords(self):
-        return list(
-            filter(None, map(lambda k: k.strip().lower(), self.keywords.split(",")))
-        )
+    def keywords(self):
+        return ", ".join(map(lambda tag: tag.name, self.tags.all()))
 
     @cached_property
     def get_minified_custom_css(self):

articles/views/html.py

@@ -74,9 +74,9 @@ class SearchArticlesListView(BaseArticleListView):
                 operator.and_, (Q(content__icontains=term) for term in search_terms)
             )
             | reduce(
-                operator.and_, (Q(keywords__icontains=term) for term in search_terms)
+                operator.and_, (Q(tags__name__icontains=term) for term in search_terms)
             )
-        )
+        ).distinct()
 
     def get_additional_querystring_params(self) -> Dict[str, str]:
         search_expression = self.request.GET.get("s")