Add implementation of Prisma vectorstore

[dqbd]

Add an implementation of Prisma vectorstore, with type safety in mind.

1. Prisma vectorstore implements a mock interface, as it depends on the types generated via prisma generate
This does mean that the code might be unnecessary brittle compared to hardcoding @prisma/client directly in user codebases.

2. Added optional generic type argument for Document metadata
Developers can now specify a concrete type for metadata prop in Document. AFAIK this does not propagate in chains etc, but I believe this to be an useful starting block.

3. fromDocuments and fromTexts is currently unsupported
As there is a significant difficulty upserting entire documents, I've marked these methods as @deprecated for now.

[hwchase17]

oh nice i like this a lot

an example would probably hel[

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[nfcampos]

A few comments, looks good otherwise

[nfcampos]

I think we'd want to remove the pageContent from metadata?

[dqbd]

At the moment, it returns the subset a Prisma model (TModel and TSelectModel), which do include the this.contentColumn).

We could remove the content column from the metadata, but I would argue that the metadata should contain the same columns, as user specifies in the dbConfig.

[MaximeThoonsen]

hello @dqbd, I was wondering if we could use typeorm to avoid adding another orm in the dependencies?

[dqbd]

Hi @MaximeThoonsen!

I was wondering if we could use typeorm to avoid adding another orm in the dependencies?

Both prisma and @prisma/client were added as a peer-dependency, it is not being actively installed when consuming langchain package. That being said, agreed, it can be removed entirely from the langchain project, as I'm stubbing the definitions.

Regardless, I think a TypeORM vectorstore implementation is certainly doable. Will look into it and possibly create a separate PR.

[nfcampos]

This looks great, thanks!