Get Items from static Collection

[Michele Claus]

Dear all,
I am trying to get all the items from a static STAC Collection
https://github.com/openEOPlatform/architecture-docs/issues/327#issuecomment-1663961413

It doesn't seem to work, does it require the /items endpoint? Would it make sense trying to add this functionality?

Code to reproduce the issue:

import pystac_client
import json
url = "https://gist.githubusercontent.com/clausmichele/cfbb823aeac0f39036b7627c1b6c7eee/raw/d1361cadf7257871436b67c73f491c4a79650cf0/vito_STAC_1_1.json"
stac_api = pystac_client.stac_api_io.StacApiIO()
stac_dict = json.loads(stac_api.read_text(url))
collection = stac_api.stac_object_from_dict(stac_dict)
items = collection.get_items()

def get_ten_items(items):
    for i, item in enumerate(items):
        print(f"{i}: {item}", flush=True)
        if i == 9:
            return

get_ten_items(items)

File ~\Miniconda3\envs\stacenv\lib\site-packages\pystac_client\collection_client.py:127, in CollectionClient.get_items(self)
    117 def get_items(self) -> Iterator["Item_Type"]:
    118     """Return all items in this Collection.
    119 
    120     If the Collection contains a link of with a `rel` value of `items`,
   (...)
    125         Iterator[Item]: Iterator of items whose parent is this catalog.
    126     """
--> 127     root = self.get_root()
    128     if root.conforms_to(ConformanceClasses.ITEM_SEARCH):
    129         search = ItemSearch(
    130             url=self._items_href(),
    131             method="GET",
   (...)
    134             modifier=self.modifier,
    135         )

File ~\Miniconda3\envs\stacenv\lib\site-packages\pystac_client\collection_client.py:108, in CollectionClient.get_root(self)
    106 root = super().get_root()
    107 if root is None or not isinstance(root, Client):
--> 108     raise ValueError(
    109         "`CollectionClient.root` is not have a valid `Client` object."
    110     )
    111 return root

ValueError: `CollectionClient.root` is not have a valid `Client` object.

[Julia Signell]

Hi! Yeah we can probably expand that error message, but my understanding is that for a static catalog you can just use pystac directly. So you would do:

import pystac
url = "https://gist.githubusercontent.com/clausmichele/cfbb823aeac0f39036b7627c1b6c7eee/raw/d1361cadf7257871436b67c73f491c4a79650cf0/vito_STAC_1_1.json"
collection = pystac.read_file(url)
items = collection.get_items()

[Michele Claus]

Thanks @jsignell, that works fine!