INTPYTHON-832 Add search_by_vector method to VectorStore

[barnuri]

This pull request adds a new method to the VectorStore class in vectorstores.py, enhancing its functionality to support similarity search directly by vector input.

New functionality:

• Added the similarity_search_by_vector method to the VectorStore class, allowing users to perform similarity searches using a query vector and returning relevant documents.

[blink1073]

Hi @barnuri, thanks again for this PR! Can you please add a test for this new method to https://github.com/langchain-ai/langchain-mongodb/blob/main/libs/langchain-mongodb/tests/integration_tests/test_vectorstore_from_texts.py?

[caseyclements]

Hi @barnuri. Just curious. Even though _similarity_search_with_score is marked for internal use by its leading underscore, what motivated you not to use it?

[barnuri]

Hi @barnuri. Just curious. Even though _similarity_search_with_score is marked for internal use by its leading underscore, what motivated you not to use it?

we have a logic that already have the vector, and tried multiple searches, so embedded it every time instead of passing the vector its a waste

[barnuri]

@blink1073 @caseyclements any update ?

[blink1073]

Patch build: https://spruce.mongodb.com/version/6924c26ca4e3be0007a802ea/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC

[blink1073]

Type checker errors:

langchain_mongodb/vectorstores.py:874: error: Signature of "similarity_search_by_vector" incompatible with supertype "langchain_core.vectorstores.base.VectorStore"  [override]
langchain_mongodb/vectorstores.py:874: note:      Superclass:
langchain_mongodb/vectorstores.py:874: note:          def similarity_search_by_vector(self, embedding: list[float], k: int = ..., **kwargs: Any) -> list[Document]
langchain_mongodb/vectorstores.py:874: note:      Subclass:
langchain_mongodb/vectorstores.py:874: note:          def similarity_search_by_vector(self, query_vector: list[float], *args: Any, **kwargs: Any) -> list[Document]
langchain_mongodb/vectorstores.py:900: error: "MongoDBAtlasVectorSearch" has no attribute "vector_store"  [attr-defined]
Installing missing stub packages:

[blink1073]

I'd suggest aligning with the superclass signature

[barnuri]

I'd suggest aligning with the superclass signature

fixed

[blink1073]

LGTM, thanks again!

[blink1073]

We're planning to wait until next week for the 0.9 release, since it is a holiday week for us.