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Fix: Table 'langchain_pg_collection' is already defined for this MetaData instance #209

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Fix: Table 'langchain_pg_collection' is already defined for this MetaData instance #209

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0xrushi
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@0xrushi 0xrushi commented May 9, 2025 •
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Possible solution for #165

Added thread locks to prevent multi table creation, optionally we can also pass extend_existing = True if required.

vector_store = PGVector(
    embeddings=OpenAIEmbeddings(),
    collection_name="test_collection",
    connection=connection_string,
    extend_existing=True,
)

@0xrushi 0xrushi mentioned this pull request May 9, 2025
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MartinGotelli
MartinGotelli reviewed May 9, 2025
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langchain_postgres/vectorstores.py Outdated
@@ -428,6 +450,7 @@ def __init__(
self._engine: Optional[Engine] = None
self._async_engine: Optional[AsyncEngine] = None
self._async_init = False
self.extend_existing = extend_existing
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This can be a private variable self._extend_existing

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@MartinGotelli MartinGotelli MartinGotelli approved these changes

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@0xrushi @MartinGotelli