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# Add MongoDB storage
- **Description:**
Add MongoDB Storage as an option for large doc store.
Example usage:
```Python
# Instantiate the MongodbStore with a MongoDB connection
from langchain.storage import MongodbStore
mongo_conn_str = "mongodb://localhost:27017/"
mongodb_store = MongodbStore(mongo_conn_str, db_name="test-db",
collection_name="test-collection")
# Set values for keys
doc1 = Document(page_content='test1')
doc2 = Document(page_content='test2')
mongodb_store.mset([("key1", doc1), ("key2", doc2)])
# Get values for keys
values = mongodb_store.mget(["key1", "key2"])
# [doc1, doc2]
# Iterate over keys
for key in mongodb_store.yield_keys():
print(key)
# Delete keys
mongodb_store.mdelete(["key1", "key2"])
```
- **Dependencies:**
Use `mongomock` for integration test.
---------
Co-authored-by: Bagatur <baskaryan@gmail.com>
Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>
74 lines
2.1 KiB
Python
74 lines
2.1 KiB
Python
from typing import Generator
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import pytest
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from langchain_core.documents import Document
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from langchain_community.storage.mongodb import MongoDBStore
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pytest.importorskip("pymongo")
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@pytest.fixture
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def mongo_store() -> Generator:
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import mongomock
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# mongomock creates a mock MongoDB instance for testing purposes
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with mongomock.patch(servers=(("localhost", 27017),)):
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yield MongoDBStore("mongodb://localhost:27017/", "test_db", "test_collection")
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def test_mset_and_mget(mongo_store: MongoDBStore) -> None:
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doc1 = Document(page_content="doc1")
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doc2 = Document(page_content="doc2")
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# Set documents in the store
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mongo_store.mset([("key1", doc1), ("key2", doc2)])
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# Get documents from the store
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retrieved_docs = mongo_store.mget(["key1", "key2"])
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assert retrieved_docs[0] and retrieved_docs[0].page_content == "doc1"
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assert retrieved_docs[1] and retrieved_docs[1].page_content == "doc2"
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def test_yield_keys(mongo_store: MongoDBStore) -> None:
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mongo_store.mset(
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[
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("key1", Document(page_content="doc1")),
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("key2", Document(page_content="doc2")),
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("another_key", Document(page_content="other")),
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]
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)
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# Test without prefix
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keys = list(mongo_store.yield_keys())
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assert set(keys) == {"key1", "key2", "another_key"}
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# Test with prefix
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keys_with_prefix = list(mongo_store.yield_keys(prefix="key"))
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assert set(keys_with_prefix) == {"key1", "key2"}
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def test_mdelete(mongo_store: MongoDBStore) -> None:
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mongo_store.mset(
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[
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("key1", Document(page_content="doc1")),
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("key2", Document(page_content="doc2")),
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]
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)
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# Delete single document
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mongo_store.mdelete(["key1"])
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remaining_docs = list(mongo_store.yield_keys())
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assert "key1" not in remaining_docs
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assert "key2" in remaining_docs
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# Delete multiple documents
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mongo_store.mdelete(["key2"])
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remaining_docs = list(mongo_store.yield_keys())
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assert len(remaining_docs) == 0
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def test_init_errors() -> None:
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with pytest.raises(ValueError):
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MongoDBStore("", "", "")
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