How to use Supabase in custom langchain code node

Questions
,
1

I am currently running the ai beta through Railway.app, using a dockerfile in a github repo.

Langchain runs great!

So now I want to use a custom langchain code node to retrieve relevant documents with relevancy score.

/**
   * Search for the most similar documents to a query,
   * and return their similarity score
   */
  similaritySearchWithScore(
    query: string,
    k = 4,
    filter: object | undefined = undefined
  ): Promise<[object, number][]>;

source: Vector stores | 🦜️🔗 Langchain

Not sure yet how to do this, but anyway when I try to use supabase in the custom code node, I get this error:

ERROR: Cannot find module '@supabase/supabase-js' [line 2]

Which is strange, because I can actually use supabase with n8n, just fine. I just want to edit the way it is used as a vector store.

Any idea on how to resolve this issue?

bg

Jelle

3

Hi @Jelle_de_Rijke, from quickly taking a look at the n8n codebase it doesn’t look like n8n calls Supabase through a custom package, but instead simply sends the required HTTP requests directly to the Supabase API.

So if you’d like to use the @supabase/supabase-js you’d to install it first, then allow n8n to use it by setting the NODE_FUNCTION_ALLOW_EXTERNAL environment variable.

4

Thanks for your response. Based on this code from Github I suspect supabase-js is already present:

1 Like
5

Oh shoot, you’re right. I was only looking at the release version, not the AI beta :see_no_evil:. Sorry for the confusion.

Did you allow the use of this npm module through the environment variable? Perhaps @oleg can confirm if there are any other steps needed to use the module as part of n8n’s langchain functionality?

7

Yes the LangChain node works the same way as the Code-Node. All packages (except the LangChain one) as to be enabled via an environment variable.

8

Thanks for your response, Jan.

I have now set my env variables in railway like so:

envarsrailway

I also tried adding them to the dockerfile.

But after redeploying I still get the same error. Perhaps I don’t understand correctly what you mean. I have used these docs: Configuration methods | n8n Docs

Thanks for any input in this regard. Super excited to try out Langchainjs in n8n instead of using Langchain Python in vscode!

9

The correct one should be @supabase/supabase-js. Can you please give that a try.

3 Likes
10

Amazing, Jan. Such a simple solution. Still getting my feet wet with nodejs :hugs:

Now let’s build!

Ps
Will post some example code here, once I get Supabase searchwithsimilarityscore running.

2 Likes
11

Glad to hear and thanks for giving back to the community!

1 Like
12

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