Patch clisops v0.16.2

[cehbrecht]

There is an issues with clisops operations in v0.16.2:

• NotImplementedError: 'item' is not yet a valid method on dask arrays in cf_convert_between_lon_frames clisops#451
• https://github.com/roocs/rooki/blob/master/notebooks/errors/cds-error-2025-09-08-cmip6-noresm2.ipynb

Fix for item is not yet a valid method on dask arrays

When subsetting CMIP6 NetCDF files with Rook, you may see errors like:

pywps.app.exceptions.ProcessError: item is not yet a valid method on dask arrays

This comes from a bug in clisops, where .item() is called on a dask-backed coordinate.

Manual Patch

Until the fix is released upstream, you can patch the installed clisops library directly:

1. Locate your clisops installation. For example, inside your Conda environment:

   $ conda activate rook
   $ python -c "import clisops, os; print(os.path.dirname(clisops.__file__))"

   This will print a path like:

   /usr/local/anaconda/envs/rook/lib/python3.11/site-packages/clisops
   

2. Edit the file:

   clisops/utils/dataset_utils.py
   

   Around line 824, you will see:

   lon_min, lon_max = ds.coords[lon].min().item(), ds.coords[lon].max().item()

3. Replace it with a safe variant that works with dask arrays:

   lon_min = float(ds.coords[lon].min().compute().values)
   lon_max = float(ds.coords[lon].max().compute().values)

4. Save the file and restart your Rook service.

In short

Become root:

sudo -i

Go to the conda packages:

cd /usr/local/anaconda/envs/rook/lib/python3.11/site-packages

Edit clisops module:

vim clisops/utils/dataset_utils.py

Go to line ":824":

 lon_min, lon_max = ds.coords[lon].min().item(), ds.coords[lon].max().item()

Replace it by:

    # TODO: fix this an new clisops release
    # lon_min, lon_max = ds.coords[lon].min().item(), ds.coords[lon].max().item()
    # PATCH
    lon_min = float(ds.coords[lon].min().compute().values)
    lon_max = float(ds.coords[lon].max().compute().values)
    # PATCH END

Restart rook:

supervisorctl restart rook

[cehbrecht]

Fixed in clisops>=0.17 and rook>=0.18