🐐GoatGuy🐐•7mo ago

Weird type error when searching by Index

I get this error when trying to filter by an index, i created it in my schema too. Argument of type 'string' is not assignable to parameter of type 'never'.ts(2345) I ahve attached image of the query.

14 Replies

rishsane•7mo ago

never type?

🐐GoatGuy🐐OP•7mo ago

How can the parameter be never type though?

rishsane•7mo ago

Yup there is never type in typescript bro It's kind of special thing

🐐GoatGuy🐐OP•7mo ago

hmm i dont get it though, i created the index and ffollowed the docs, got no clue why it's giving me that linter error

sshader•7mo ago

Try giving ctx a type annotation with MutaitonCtx from _generated/server? (https://labs.convex.dev/auth/advanced#writing-additional-data-during-authentication) TS needs the type annotation to know about all the tables defined in your schema (not just the ones defined in the auth schema)

Advanced: Details - Convex Auth

Authentication library for your Convex backend

rishsane•7mo ago

Do you know what is never type?

🐐GoatGuy🐐OP•7mo ago

I assume it means it never returns something?

ballingt•7mo ago

@🐐GoatGuy🐐 yeah see Sarah's comment, there's no way that this callback function can know about all your other tables, it only knows about those that come with Convex Auth unless you use MutationCtx explicitly When you write normal mutations etc. you use the mutation() wrapper imported from ../convex/_generated/server which imports from your schema. But the convexAuth() function doens't know about your schema, it's imported from the Convex Auth library.

rishsane•7mo ago

Right. But there are some special cases.

function fail(): never {
    throw new Error("This function never returns!");
}

const result = fail(); // Type of `result` is `never`

function fail(): never {
    throw new Error("This function never returns!");
}

const result = fail(); // Type of `result` is `never`

We can't console.log(result)

Hedi M. Sharif•3mo ago

Stil have the same issue, ant MutationCtx doesn't work, can someone help me with that

handler: async (ctx: MutationCtx, args) => {
    const { userId, vehicleData } = args;

    // Validate user exists
    const user = await ctx.db.get(userId);
    if (!user) {
      throw new Error("User not found");
    }

    // Check if plate number already exists
    const existingVehicle = await ctx.db
      .query("vehicles")
      .withIndex("by_plate", (q) =>
        q.eq("plateNumber", vehicleData.plateNumber)
      )
      .first();

handler: async (ctx: MutationCtx, args) => {
    const { userId, vehicleData } = args;

    // Validate user exists
    const user = await ctx.db.get(userId);
    if (!user) {
      throw new Error("User not found");
    }

    // Check if plate number already exists
    const existingVehicle = await ctx.db
      .query("vehicles")
      .withIndex("by_plate", (q) =>
        q.eq("plateNumber", vehicleData.plateNumber)
      )
      .first();

erquhart•3mo ago

Can you share a screenshot with type errors? MutationCtx missing the type either means it's not there, convex dev wasn't run, or there's some other error(s) throwing it off

Sara•3mo ago

I thought of the same thing and ran something on my running dev, and it looks like that the db for that function is warepped in " ctx: GenericMutationCtx<AnyDataModel>" which is empty, I solved it by using adding a second query, and running the ct.runQuery, no errors there plus: just a small tip, the args already pass down exsistingUserId, I don't know if that would help in your case!

Sara•3mo ago

erquhart•3mo ago

Interesting, wonder why that method isn't generic

Weird type error when searching by Index

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