fix: use correct type hint for '*path' args (#300)

PEP 484 specifies that they be hinted as the type of a single element,
as seen from the caller's perspective.

Closes #289.

Co-authored-by: Christopher Wilcox <crwilcox@google.com>

Author: tseaver

packages/google-cloud-firestore/google/cloud/firestore_v1/async_client.py

@@ -49,7 +49,7 @@
 from google.cloud.firestore_v1.services.firestore.transports import (
     grpc_asyncio as firestore_grpc_transport,
 )
-from typing import Any, AsyncGenerator, Iterable, Tuple
+from typing import Any, AsyncGenerator, Iterable
 
 
 class AsyncClient(BaseClient):
@@ -119,7 +119,7 @@ def _target(self):
         """
         return self._target_helper(firestore_client.FirestoreAsyncClient)
 
-    def collection(self, *collection_path: Tuple[str]) -> AsyncCollectionReference:
+    def collection(self, *collection_path: str) -> AsyncCollectionReference:
         """Get a reference to a collection.
 
         For a top-level collection:
@@ -139,7 +139,7 @@ def collection(self, *collection_path: Tuple[str]) -> AsyncCollectionReference:
         Sub-collections can be nested deeper in a similar fashion.
 
         Args:
-            collection_path (Tuple[str, ...]): Can either be
+            collection_path: Can either be
 
                 * A single ``/``-delimited path to a collection
                 * A tuple of collection path segments
@@ -172,7 +172,7 @@ def collection_group(self, collection_id: str) -> AsyncCollectionGroup:
         """
         return AsyncCollectionGroup(self._get_collection_reference(collection_id))
 
-    def document(self, *document_path: Tuple[str]) -> AsyncDocumentReference:
+    def document(self, *document_path: str) -> AsyncDocumentReference:
         """Get a reference to a document in a collection.
 
         For a top-level document:
@@ -194,7 +194,7 @@ def document(self, *document_path: Tuple[str]) -> AsyncDocumentReference:
         Documents in sub-collections can be nested deeper in a similar fashion.
 
         Args:
-            document_path (Tuple[str, ...]): Can either be
+            document_path: Can either be
 
                 * A single ``/``-delimited path to a document
                 * A tuple of document path segments

packages/google-cloud-firestore/google/cloud/firestore_v1/base_client.py

@@ -314,7 +314,7 @@ def _document_path_helper(self, *document_path) -> List[str]:
         return joined_path.split(_helpers.DOCUMENT_PATH_DELIMITER)
 
     @staticmethod
-    def field_path(*field_names: Tuple[str]) -> str:
+    def field_path(*field_names: str) -> str:
         """Create a **field path** from a list of nested field names.
 
         A **field path** is a ``.``-delimited concatenation of the field
@@ -335,7 +335,7 @@ def field_path(*field_names: Tuple[str]) -> str:
         ``data['aa']['bb']['cc']``.
 
         Args:
-            field_names (Tuple[str, ...]): The list of field names.
+            field_names: The list of field names.
 
         Returns:
             str: The ``.``-delimited field path.

packages/google-cloud-firestore/google/cloud/firestore_v1/client.py

@@ -44,7 +44,7 @@
 from google.cloud.firestore_v1.services.firestore.transports import (
     grpc as firestore_grpc_transport,
 )
-from typing import Any, Generator, Iterable, Tuple
+from typing import Any, Generator, Iterable
 
 # Types needed only for Type Hints
 from google.cloud.firestore_v1.base_document import DocumentSnapshot
@@ -117,7 +117,7 @@ def _target(self):
         """
         return self._target_helper(firestore_client.FirestoreClient)
 
-    def collection(self, *collection_path: Tuple[str]) -> CollectionReference:
+    def collection(self, *collection_path: str) -> CollectionReference:
         """Get a reference to a collection.
 
         For a top-level collection:
@@ -137,7 +137,7 @@ def collection(self, *collection_path: Tuple[str]) -> CollectionReference:
         Sub-collections can be nested deeper in a similar fashion.
 
         Args:
-            collection_path (Tuple[str, ...]): Can either be
+            collection_path: Can either be
 
                 * A single ``/``-delimited path to a collection
                 * A tuple of collection path segments
@@ -170,7 +170,7 @@ def collection_group(self, collection_id: str) -> CollectionGroup:
         """
         return CollectionGroup(self._get_collection_reference(collection_id))
 
-    def document(self, *document_path: Tuple[str]) -> DocumentReference:
+    def document(self, *document_path: str) -> DocumentReference:
         """Get a reference to a document in a collection.
 
         For a top-level document:
@@ -192,7 +192,7 @@ def document(self, *document_path: Tuple[str]) -> DocumentReference:
         Documents in sub-collections can be nested deeper in a similar fashion.
 
         Args:
-            document_path (Tuple[str, ...]): Can either be
+            document_path): Can either be
 
                 * A single ``/``-delimited path to a document
                 * A tuple of document path segments