core[minor]: Add support for DocumentIndex in the index api (#25100)

Support document index in the index api.

libs/core/langchain_core/indexing/api.py

@@ -27,7 +27,7 @@ from typing import (
 
 from langchain_core.document_loaders.base import BaseLoader
 from langchain_core.documents import Document
-from langchain_core.indexing.base import RecordManager
+from langchain_core.indexing.base import DocumentIndex, RecordManager
 from langchain_core.pydantic_v1 import root_validator
 from langchain_core.vectorstores import VectorStore
 
@@ -106,6 +106,7 @@ class _HashedDocument(Document):
     def to_document(self) -> Document:
         """Return a Document object."""
         return Document(
+            id=self.uid,
             page_content=self.page_content,
             metadata=self.metadata,
         )
@@ -195,7 +196,7 @@ class IndexingResult(TypedDict):
 def index(
     docs_source: Union[BaseLoader, Iterable[Document]],
     record_manager: RecordManager,
-    vector_store: VectorStore,
+    vector_store: Union[VectorStore, DocumentIndex],
     *,
     batch_size: int = 100,
     cleanup: Literal["incremental", "full", None] = None,
@@ -232,7 +233,7 @@ def index(
         docs_source: Data loader or iterable of documents to index.
         record_manager: Timestamped set to keep track of which documents were
                          updated.
-        vector_store: Vector store to index the documents into.
+        vector_store: VectorStore or DocumentIndex to index the documents into.
         batch_size: Batch size to use when indexing. Default is 100.
         cleanup: How to handle clean up of documents. Default is None.
             - Incremental: Cleans up all documents that haven't been updated AND
@@ -274,19 +275,30 @@ def index(
     if cleanup == "incremental" and source_id_key is None:
         raise ValueError("Source id key is required when cleanup mode is incremental.")
 
+    destination = vector_store  # Renaming internally for clarity
+
+    # If it's a vectorstore, let's check if it has the required methods.
+    if isinstance(destination, VectorStore):
         # Check that the Vectorstore has required methods implemented
         methods = ["delete", "add_documents"]
 
         for method in methods:
-        if not hasattr(vector_store, method):
+            if not hasattr(destination, method):
                 raise ValueError(
-                f"Vectorstore {vector_store} does not have required method {method}"
+                    f"Vectorstore {destination} does not have required method {method}"
                 )
 
-    if type(vector_store).delete == VectorStore.delete:
+        if type(destination).delete == VectorStore.delete:
             # Checking if the vectorstore has overridden the default delete method
             # implementation which just raises a NotImplementedError
             raise ValueError("Vectorstore has not implemented the delete method")
+    elif isinstance(destination, DocumentIndex):
+        pass
+    else:
+        raise TypeError(
+            f"Vectorstore should be either a VectorStore or a DocumentIndex. "
+            f"Got {type(destination)}."
+        )
 
     if isinstance(docs_source, BaseLoader):
         try:
@@ -354,7 +366,13 @@ def index(
         # Be pessimistic and assume that all vector store write will fail.
         # First write to vector store
         if docs_to_index:
-            vector_store.add_documents(docs_to_index, ids=uids, batch_size=batch_size)
+            if isinstance(destination, VectorStore):
+                destination.add_documents(
+                    docs_to_index, ids=uids, batch_size=batch_size
+                )
+            elif isinstance(destination, DocumentIndex):
+                destination.upsert(docs_to_index)
+
             num_added += len(docs_to_index) - len(seen_docs)
             num_updated += len(seen_docs)
 
@@ -384,7 +402,7 @@ def index(
             )
             if uids_to_delete:
                 # Then delete from vector store.
-                vector_store.delete(uids_to_delete)
+                destination.delete(uids_to_delete)
                 # First delete from record store.
                 record_manager.delete_keys(uids_to_delete)
                 num_deleted += len(uids_to_delete)
@@ -394,7 +412,7 @@ def index(
             before=index_start_dt, limit=cleanup_batch_size
         ):
             # First delete from record store.
-            vector_store.delete(uids_to_delete)
+            destination.delete(uids_to_delete)
             # Then delete from record manager.
             record_manager.delete_keys(uids_to_delete)
             num_deleted += len(uids_to_delete)
@@ -417,7 +435,7 @@ async def _to_async_iterator(iterator: Iterable[T]) -> AsyncIterator[T]:
 async def aindex(
     docs_source: Union[BaseLoader, Iterable[Document], AsyncIterator[Document]],
     record_manager: RecordManager,
-    vector_store: VectorStore,
+    vectorstore: Union[VectorStore, DocumentIndex],
     *,
     batch_size: int = 100,
     cleanup: Literal["incremental", "full", None] = None,
@@ -446,7 +464,7 @@ async def aindex(
         docs_source: Data loader or iterable of documents to index.
         record_manager: Timestamped set to keep track of which documents were
                          updated.
-        vector_store: Vector store to index the documents into.
+        vectorstore: Vector store or Document Index to index the documents into
         batch_size: Batch size to use when indexing. Default is 100.
         cleanup: How to handle clean up of documents. Default is None.
             - Incremental: Cleans up all documents that haven't been updated AND
@@ -488,20 +506,31 @@ async def aindex(
     if cleanup == "incremental" and source_id_key is None:
         raise ValueError("Source id key is required when cleanup mode is incremental.")
 
+    destination = vectorstore  # Renaming internally for clarity
+
+    # If it's a vectorstore, let's check if it has the required methods.
+    if isinstance(destination, VectorStore):
+        # Check that the Vectorstore has required methods implemented
         # Check that the Vectorstore has required methods implemented
         methods = ["adelete", "aadd_documents"]
 
         for method in methods:
-        if not hasattr(vector_store, method):
+            if not hasattr(destination, method):
                 raise ValueError(
-                f"Vectorstore {vector_store} does not have required method {method}"
+                    f"Vectorstore {destination} does not have required method {method}"
                 )
 
-    if type(vector_store).adelete == VectorStore.adelete:
+        if type(destination).adelete == VectorStore.adelete:
             # Checking if the vectorstore has overridden the default delete method
             # implementation which just raises a NotImplementedError
             raise ValueError("Vectorstore has not implemented the delete method")
-
+    elif isinstance(destination, DocumentIndex):
+        pass
+    else:
+        raise TypeError(
+            f"Vectorstore should be either a VectorStore or a DocumentIndex. "
+            f"Got {type(destination)}."
+        )
     async_doc_iterator: AsyncIterator[Document]
     if isinstance(docs_source, BaseLoader):
         try:
@@ -577,9 +606,12 @@ async def aindex(
         # Be pessimistic and assume that all vector store write will fail.
         # First write to vector store
         if docs_to_index:
-            await vector_store.aadd_documents(
+            if isinstance(destination, VectorStore):
+                await destination.aadd_documents(
                     docs_to_index, ids=uids, batch_size=batch_size
                 )
+            elif isinstance(destination, DocumentIndex):
+                await destination.aupsert(docs_to_index)
             num_added += len(docs_to_index) - len(seen_docs)
             num_updated += len(seen_docs)
 
@@ -610,7 +642,7 @@ async def aindex(
             )
             if uids_to_delete:
                 # Then delete from vector store.
-                await vector_store.adelete(uids_to_delete)
+                await destination.adelete(uids_to_delete)
                 # First delete from record store.
                 await record_manager.adelete_keys(uids_to_delete)
                 num_deleted += len(uids_to_delete)
@@ -620,7 +652,7 @@ async def aindex(
             before=index_start_dt, limit=cleanup_batch_size
         ):
             # First delete from record store.
-            await vector_store.adelete(uids_to_delete)
+            await destination.adelete(uids_to_delete)
             # Then delete from record manager.
             await record_manager.adelete_keys(uids_to_delete)
             num_deleted += len(uids_to_delete)

libs/core/tests/unit_tests/indexing/test_indexing.py

@@ -16,6 +16,7 @@ from langchain_core.documents import Document
 from langchain_core.embeddings import DeterministicFakeEmbedding
 from langchain_core.indexing import InMemoryRecordManager, aindex, index
 from langchain_core.indexing.api import _abatch, _HashedDocument
+from langchain_core.indexing.in_memory import InMemoryDocumentIndex
 from langchain_core.vectorstores import InMemoryVectorStore, VectorStore
 
 
@@ -1284,7 +1285,10 @@ def test_indexing_custom_batch_size(
 
         index(docs, record_manager, vector_store, batch_size=batch_size)
         args, kwargs = mock_add_documents.call_args
-        assert args == (docs,)
+        doc_with_id = Document(
+            id=ids[0], page_content="This is a test document.", metadata={"source": "1"}
+        )
+        assert args == ([doc_with_id],)
         assert kwargs == {"ids": ids, "batch_size": batch_size}
     finally:
         vector_store.add_documents = original  # type: ignore
@@ -1304,8 +1308,102 @@ async def test_aindexing_custom_batch_size(
 
     batch_size = 1
     mock_add_documents = AsyncMock()
+    doc_with_id = Document(
+        id=ids[0], page_content="This is a test document.", metadata={"source": "1"}
+    )
     vector_store.aadd_documents = mock_add_documents  # type: ignore
     await aindex(docs, arecord_manager, vector_store, batch_size=batch_size)
     args, kwargs = mock_add_documents.call_args
-    assert args == (docs,)
+    assert args == ([doc_with_id],)
     assert kwargs == {"ids": ids, "batch_size": batch_size}
+
+
+def test_index_into_document_index(record_manager: InMemoryRecordManager) -> None:
+    """Get an in memory index."""
+    document_index = InMemoryDocumentIndex()
+    docs = [
+        Document(
+            page_content="This is a test document.",
+            metadata={"source": "1"},
+        ),
+        Document(
+            page_content="This is another document.",
+            metadata={"source": "2"},
+        ),
+    ]
+
+    assert index(docs, record_manager, document_index, cleanup="full") == {
+        "num_added": 2,
+        "num_deleted": 0,
+        "num_skipped": 0,
+        "num_updated": 0,
+    }
+
+    assert index(docs, record_manager, document_index, cleanup="full") == {
+        "num_added": 0,
+        "num_deleted": 0,
+        "num_skipped": 2,
+        "num_updated": 0,
+    }
+
+    assert index(
+        docs, record_manager, document_index, cleanup="full", force_update=True
+    ) == {
+        "num_added": 0,
+        "num_deleted": 0,
+        "num_skipped": 0,
+        "num_updated": 2,
+    }
+
+    assert index([], record_manager, document_index, cleanup="full") == {
+        "num_added": 0,
+        "num_deleted": 2,
+        "num_skipped": 0,
+        "num_updated": 0,
+    }
+
+
+async def test_aindex_into_document_index(
+    arecord_manager: InMemoryRecordManager,
+) -> None:
+    """Get an in memory index."""
+    document_index = InMemoryDocumentIndex()
+    docs = [
+        Document(
+            page_content="This is a test document.",
+            metadata={"source": "1"},
+        ),
+        Document(
+            page_content="This is another document.",
+            metadata={"source": "2"},
+        ),
+    ]
+
+    assert await aindex(docs, arecord_manager, document_index, cleanup="full") == {
+        "num_added": 2,
+        "num_deleted": 0,
+        "num_skipped": 0,
+        "num_updated": 0,
+    }
+
+    assert await aindex(docs, arecord_manager, document_index, cleanup="full") == {
+        "num_added": 0,
+        "num_deleted": 0,
+        "num_skipped": 2,
+        "num_updated": 0,
+    }
+    assert await aindex(
+        docs, arecord_manager, document_index, cleanup="full", force_update=True
+    ) == {
+        "num_added": 0,
+        "num_deleted": 0,
+        "num_skipped": 0,
+        "num_updated": 2,
+    }
+
+    assert await aindex([], arecord_manager, document_index, cleanup="full") == {
+        "num_added": 0,
+        "num_deleted": 2,
+        "num_skipped": 0,
+        "num_updated": 0,
+    }

libs/langchain/tests/unit_tests/indexes/test_indexing.py

@@ -1386,7 +1386,14 @@ def test_indexing_custom_batch_size(
     with patch.object(vector_store, "add_documents") as mock_add_documents:
         index(docs, record_manager, vector_store, batch_size=batch_size)
         args, kwargs = mock_add_documents.call_args
-        assert args == (docs,)
+        docs_with_id = [
+            Document(
+                page_content="This is a test document.",
+                metadata={"source": "1"},
+                id=ids[0],
+            )
+        ]
+        assert args == (docs_with_id,)
         assert kwargs == {"ids": ids, "batch_size": batch_size}
 
 
@@ -1407,5 +1414,12 @@ async def test_aindexing_custom_batch_size(
     with patch.object(vector_store, "aadd_documents") as mock_add_documents:
         await aindex(docs, arecord_manager, vector_store, batch_size=batch_size)
         args, kwargs = mock_add_documents.call_args
-        assert args == (docs,)
+        docs_with_id = [
+            Document(
+                page_content="This is a test document.",
+                metadata={"source": "1"},
+                id=ids[0],
+            )
+        ]
+        assert args == (docs_with_id,)
         assert kwargs == {"ids": ids, "batch_size": batch_size}