Update DataArray.to_zarr to match Dataset.to_zarr. (#10164)

Author: Karl-Krauth

doc/whats-new.rst

@@ -37,6 +37,10 @@ Deprecations
 Bug fixes
 ~~~~~~~~~
 
+- Update the parameters of :py:meth:`~xarray.DataArray.to_zarr` to match :py:meth:`~xarray.Dataset.to_zarr`.
+  This fixes the issue where using the ``zarr_version`` parameter would raise a deprecation warning telling the user to use
+  a non-existent ``zarr_format`` parameter instead. (:issue:`10163`, :pull:`10164`)
+  By `Karl Krauth <https://github.com/Karl-Krauth>`_.
 
 Documentation
 ~~~~~~~~~~~~~

xarray/core/dataarray.py

@@ -4242,6 +4242,9 @@ def to_zarr(
         safe_chunks: bool = True,
         storage_options: dict[str, str] | None = None,
         zarr_version: int | None = None,
+        zarr_format: int | None = None,
+        write_empty_chunks: bool | None = None,
+        chunkmanager_store_kwargs: dict[str, Any] | None = None,
     ) -> ZarrStore: ...
 
     # compute=False returns dask.Delayed
@@ -4262,6 +4265,9 @@ def to_zarr(
         safe_chunks: bool = True,
         storage_options: dict[str, str] | None = None,
         zarr_version: int | None = None,
+        zarr_format: int | None = None,
+        write_empty_chunks: bool | None = None,
+        chunkmanager_store_kwargs: dict[str, Any] | None = None,
     ) -> Delayed: ...
 
     def to_zarr(
@@ -4280,6 +4286,9 @@ def to_zarr(
         safe_chunks: bool = True,
         storage_options: dict[str, str] | None = None,
         zarr_version: int | None = None,
+        zarr_format: int | None = None,
+        write_empty_chunks: bool | None = None,
+        chunkmanager_store_kwargs: dict[str, Any] | None = None,
     ) -> ZarrStore | Delayed:
         """Write DataArray contents to a Zarr store
 
@@ -4380,9 +4389,30 @@ def to_zarr(
             Any additional parameters for the storage backend (ignored for local
             paths).
         zarr_version : int or None, optional
-            The desired zarr spec version to target (currently 2 or 3). The
-            default of None will attempt to determine the zarr version from
-            ``store`` when possible, otherwise defaulting to 2.
+
+            .. deprecated:: 2024.9.1
+            Use ``zarr_format`` instead.
+
+        zarr_format : int or None, optional
+            The desired zarr format to target (currently 2 or 3). The default
+            of None will attempt to determine the zarr version from ``store`` when
+            possible, otherwise defaulting to the default version used by
+            the zarr-python library installed.
+        write_empty_chunks : bool or None, optional
+            If True, all chunks will be stored regardless of their
+            contents. If False, each chunk is compared to the array's fill value
+            prior to storing. If a chunk is uniformly equal to the fill value, then
+            that chunk is not be stored, and the store entry for that chunk's key
+            is deleted. This setting enables sparser storage, as only chunks with
+            non-fill-value data are stored, at the expense of overhead associated
+            with checking the data of each chunk. If None (default) fall back to
+            specification(s) in ``encoding`` or Zarr defaults. A ``ValueError``
+            will be raised if the value of this (if not None) differs with
+            ``encoding``.
+        chunkmanager_store_kwargs : dict, optional
+            Additional keyword arguments passed on to the `ChunkManager.store` method used to store
+            chunked arrays. For example for a dask array additional kwargs will be passed eventually to
+            :py:func:`dask.array.store()`. Experimental API that should not be relied upon.
 
         Returns
         -------
@@ -4448,6 +4478,9 @@ def to_zarr(
             safe_chunks=safe_chunks,
             storage_options=storage_options,
             zarr_version=zarr_version,
+            zarr_format=zarr_format,
+            write_empty_chunks=write_empty_chunks,
+            chunkmanager_store_kwargs=chunkmanager_store_kwargs,
         )
 
     def to_dict(