Bug fix: Unable to preview custom streams.

apps/channels/migrations/0029_backfill_custom_stream_hashes.py

@@ -0,0 +1,54 @@
+# Generated migration to backfill stream_hash for existing custom streams
+
+from django.db import migrations
+import hashlib
+
+
+def backfill_custom_stream_hashes(apps, schema_editor):
+    """
+    Generate stream_hash for all custom streams that don't have one.
+    Uses stream ID to create a stable hash that won't change when name/url is edited.
+    """
+    Stream = apps.get_model('dispatcharr_channels', 'Stream')
+
+    custom_streams_without_hash = Stream.objects.filter(
+        is_custom=True,
+        stream_hash__isnull=True
+    )
+
+    updated_count = 0
+    for stream in custom_streams_without_hash:
+        # Generate a stable hash using the stream's ID
+        # This ensures the hash never changes even if name/url is edited
+        unique_string = f"custom_stream_{stream.id}"
+        stream.stream_hash = hashlib.sha256(unique_string.encode()).hexdigest()
+        stream.save(update_fields=['stream_hash'])
+        updated_count += 1
+
+    if updated_count > 0:
+        print(f"Backfilled stream_hash for {updated_count} custom streams")
+    else:
+        print("No custom streams needed stream_hash backfill")
+
+
+def reverse_backfill(apps, schema_editor):
+    """
+    Reverse migration - clear stream_hash for custom streams.
+    Note: This will break preview functionality for custom streams.
+    """
+    Stream = apps.get_model('dispatcharr_channels', 'Stream')
+
+    custom_streams = Stream.objects.filter(is_custom=True)
+    count = custom_streams.update(stream_hash=None)
+    print(f"Cleared stream_hash for {count} custom streams")
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dispatcharr_channels', '0028_channel_created_at_channel_updated_at'),
+    ]
+
+    operations = [
+        migrations.RunPython(backfill_custom_stream_hashes, reverse_backfill),
+    ]

apps/channels/signals.py

@@ -45,6 +45,20 @@ def set_default_m3u_account(sender, instance, **kwargs):
         else:
             raise ValueError("No default M3UAccount found.")
 
+@receiver(post_save, sender=Stream)
+def generate_custom_stream_hash(sender, instance, created, **kwargs):
+    """
+    Generate a stable stream_hash for custom streams after creation.
+    Uses the stream's ID to ensure the hash never changes even if name/url is edited.
+    """
+    if instance.is_custom and not instance.stream_hash and created:
+        import hashlib
+        # Use stream ID for a stable, unique hash that never changes
+        unique_string = f"custom_stream_{instance.id}"
+        instance.stream_hash = hashlib.sha256(unique_string.encode()).hexdigest()
+        # Use update to avoid triggering signals again
+        Stream.objects.filter(id=instance.id).update(stream_hash=instance.stream_hash)
+
 @receiver(post_save, sender=Channel)
 def refresh_epg_programs(sender, instance, created, **kwargs):
     """