Does not represent a CollectionClient instance error when running stac-client collections

[robintw]

I'm the author of #113, and am trying to check that bug is fixed. However, I seem to have run into another issue - but I don't know whether it is a pystac-client issue, a pystac issue or a stac-fastapi issue. I hope someone here might be able to work out where the bug is and then I can submit an issue at the right place.

When running:

stac-client collections http://robin-stac-fastapi-test.azurewebsites.net

I get the following output:

{'id': 'joplin', 'type': 'collection', 'links': [{'rel': 'items', 'type': 'application/geo+json', 'href': 'https://robin-stac-fastapi-test.azurewebsites.net/collections/joplin/items'}, {'rel': 'parent', 'type': 'application/json', 'href': 'https://robin-stac-fastapi-test.azurewebsites.net/'}, {'rel': 'root', 'type': 'application/json', 'href': 'https://robin-stac-fastapi-test.azurewebsites.net/'}, {'rel': 'self', 'type': 'application/json', 'href': 'https://robin-stac-fastapi-test.azurewebsites.net/collections/joplin'}], 'extent': {'spatial': {'bbox': [[-94.6911621, 37.0332547, -94.402771, 37.1077651]]}, 'temporal': {'interval': [['2000-02-01T00:00:00Z', '2000-02-12T00:00:00Z']]}}, 'license': 'public-domain', 'description': 'This imagery was acquired by the NOAA Remote Sensing Division to support NOAA national security and emergency response requirements. In addition, it will be used for ongoing research efforts for testing and developing standards for airborne digital imagery. Individual images have been combined into a larger mosaic and tiled for distribution. The approximate ground sample distance (GSD) for each pixel is 35 cm (1.14 feet).', 'stac_version': '1.0.0'} does not represent a CollectionClient instance

The key bit seems to be the last bit: does not represent a CollectionClient instance.

The URL is a deployment of stac-fastapi that I've set up, and it seems to work fine with every other tool I've used it with. That makes me think that this might be a problem in pystac-client or pystac - but as I said above, I'm not sure, and I'm happy to be corrected.

I'm happy for you to look at the URL and browse the JSON returned to try and debug this - but I'm not quite sure how to debug it myself (I got very lost in the pystac/pystac-client code last time I tried).

Any ideas would be much appreciated.

[gadomski]

This appears to be an issue with the STAC Catalog you've set up at http://robin-stac-fastapi-test.azurewebsites.net -- the collection with id == "joplin" has an incorrect type field (notice the lowercase "collection"):

However, it's hard to know that from the error message -- I've opened #130 to capture that difficulty.

[robintw]

Great - that's really helpful @gadomski, thank you. Thanks for creating the issue for more informative error messages too.

I think that joplin collection came from the sample data provided with stac-fastapi. I'll check that, and if so, I'll raise an issue there.