community[patch]: deprecate persist method in Chroma (langchain-ai#20855

)

Thank you for contributing to LangChain!

- [x] **PR title**

- [x] **PR message**:
- **Description:** Deprecate persist method in Chroma no longer exists
in Chroma 0.4.x
    - **Issue:** langchain-ai#20851 
    - **Dependencies:** None
    - **Twitter handle:** AndresAlgaba1

- [x] **Add tests and docs**: If you're adding a new integration, please
include
1. a test for the integration, preferably unit tests that do not rely on
network access,
2. an example notebook showing its use. It lives in
`docs/docs/integrations` directory.

- [x] **Lint and test**: Run `make format`, `make lint` and `make test`
from the root of the package(s) you've modified. See contribution
guidelines for more: https://python.langchain.com/docs/contributing/

---------

Co-authored-by: Bagatur <[email protected]>

libs/community/langchain_community/vectorstores/chroma.py

@@ -16,6 +16,7 @@
 )
 
 import numpy as np
+from langchain_core._api import deprecated
 from langchain_core.documents import Document
 from langchain_core.embeddings import Embeddings
 from langchain_core.utils import xor_args
@@ -610,11 +611,22 @@ def get(
 
         return self._collection.get(**kwargs)
 
+    @deprecated(
+        since="0.1.17",
+        message=(
+            "Since Chroma 0.4.x the manual persistence method is no longer "
+            "supported as docs are automatically persisted."
+        ),
+        removal="0.3.0",
+    )
     def persist(self) -> None:
         """Persist the collection.
 
         This can be used to explicitly persist the data to disk.
         It will also be called automatically when the object is destroyed.
+
+        Since Chroma 0.4.x the manual persistence method is no longer
+        supported as docs are automatically persisted.
         """
         if self._persist_directory is None:
             raise ValueError(

libs/community/tests/integration_tests/vectorstores/test_chroma.py

@@ -136,8 +136,6 @@ def test_chroma_with_persistence() -> None:
     output = docsearch.similarity_search("foo", k=1)
     assert output == [Document(page_content="foo")]
 
-    docsearch.persist()
-
     # Get a new VectorStore from the persisted directory
     docsearch = Chroma(
         collection_name=collection_name,