[BUG] Media lost after view.save()

[mmoollllee]

Describe the problem

Media does not show anymore in the App after I remaped labels in a python session. After hitting view.save() media was gone!?
Is there any cache I should clear?

Code to reproduce issue

This happend for two independend datasets:

1. I opened a python interpreter in the terminal
2. launched a fiftyone sessione

import fiftyone as fo
from fiftyone import ViewField as F
session = fo.launch_app()

3. created a view

view = dataset.match(F("ground_truth.detections").length())
view = session.dataset.map_labels("ground_truth", {"AAAAA": "BBBBB"})
view.save()

Looks like every sample within the view is okay?

System information

• macOS 14.4 (23E214)
• Python 3.9.18
• FiftyOne v0.23.6, Voxel51, Inc.
• FiftyOne installed from (pip or source): pip

[brimoor]

I tried to reproduce but this works fine:

import fiftyone as fo
import fiftyone.zoo as foz
from fiftyone import ViewField as F

dataset = foz.load_zoo_dataset("quickstart")

session = fo.launch_app(dataset)

print(len(dataset))  # 200
print(dataset.count("ground_truth.detections"))  # 1232

view = dataset.match(F("ground_truth.detections").length())

print(len(view))  # 199

view2 = view.map_labels("ground_truth", {"carrot": "CARROT"})
view2.save()

## ensure data is all still there

print(len(view))  # 199
print(len(dataset))  # 200
print(dataset.count("ground_truth.detections"))  # 1232
print(dataset.count_values("ground_truth.detections.label")["CARROT"])  # 47

## refresh app, everything looks fine

[mmoollllee]

Yeah same for me with the quickstart dataset...

More info on what I notice on media NOT showing:

• in the overview the select checkbox does not show up on hover
• in metadata section bytes, file_type and num_channels is showing up

On media showing:

• in metadata section bytes, file_type and num_channels is not showing up

Looks like metadata was ommitted when I saved the view?
So I tried:

dataset.compute_metadata(overwrite=True, skip_failures=False, warn_failures=True, progress=True)

Now every sample has metadata, but no change.

I came up with the glory idea to open the app in the browser. In the console I got TypeError: e.detections is null for media without ground_truth.

view = session.dataset.match(F("ground_truth.detections").length() == 0)
for sample in view:
   sample["ground_truth"] # Returns <Detections: {'detections': []}>

What should I set them to?
Maybe still a bug that this happend?

[benjaminpkane]

Fixed by #4345