make Category.slug unique

categories/base.py

@@ -46,7 +46,7 @@ class CategoryBase(MPTTModel):
         verbose_name=_("parent"),
     )
     name = models.CharField(max_length=100, verbose_name=_("name"))
-    slug = models.SlugField(verbose_name=_("slug"))
+    slug = models.SlugField(verbose_name=_("slug"), unique=True)
     active = models.BooleanField(default=True, verbose_name=_("active"))
 
     objects = CategoryManager()

categories/migrations/0005_unique_category_slug.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.0.9 on 2018-10-05 13:59
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("categories", "0004_auto_20200517_1832"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="category",
+            name="slug",
+            field=models.SlugField(unique=True, verbose_name="slug"),
+        ),
+    ]