slug generating updated

apps/course/models/course.py

@@ -440,11 +440,53 @@ class Course(models.Model):
 
     def save(self, *args, **kwargs):
         self.title = format_multilingual_field(self.title)
-        if not self.slug or self.slug == []:
+        
+        # Check if the title has changed (or if this is a new course)
+        title_changed = False
+        if not self.pk:
+            title_changed = True
+        else:
             try:
-                self.slug = generate_language_slugs(self.title)
-            except Exception:
-                self.slug = []
+                original = self.__class__.objects.get(pk=self.pk)
+                title_changed = original.title != self.title
+            except self.__class__.DoesNotExist:
+                title_changed = True
+
+        if title_changed:
+            # Extract the English title
+            english_title = ""
+            if isinstance(self.title, list):
+                for tr in self.title:
+                    if isinstance(tr, dict) and tr.get("language_code") == "en":
+                        english_title = tr.get("title") or tr.get("text") or tr.get("value") or ""
+                        break
+                # Fallback to any non-empty title if English title isn't found
+                if not english_title:
+                    for tr in self.title:
+                        if isinstance(tr, dict):
+                            english_title = tr.get("title") or tr.get("text") or tr.get("value") or ""
+                            if english_title:
+                                break
+
+            base_slug = slugify(str(english_title or ""))
+            if not base_slug:
+                base_slug = "course"
+
+            val = base_slug
+            counter = 1
+            # Resolve global uniqueness collision (across other courses)
+            while True:
+                qs = self.__class__.objects.filter(slug__contains=[{"title": val}])
+                if self.pk:
+                    qs = qs.exclude(pk=self.pk)
+                
+                if qs.exists():
+                    val = f"{base_slug}-{counter}"
+                    counter += 1
+                else:
+                    break
+            
+            self.slug = [{"language_code": "en", "title": val}]
         else:
             self.slug = format_multilingual_field(self.slug)