opts object passed to mutation , i can not understand where it came from

AGAyush Goyal

6/10/2023

export const authorizedProcedure = publicProcedure
  .input(z.object({ townName: z.string() }))
  .use((opts) => {
    if (opts.input.townName !== 'Pucklechurch') {
      throw new TRPCError({
        code: 'FORBIDDEN',
        message: "We don't take kindly to out-of-town folk",
      });
    }
 
    return opts.next();
  });
 
export const appRouter = t.router({
  hello: authorizedProcedure.query(() => {
    return {
      message: 'hello world',
    };
  }),
  goodbye: authorizedProcedure.mutation(async (opts) => {
    await opts.ctx.signGuestBook();
 
    return {
      message: 'goodbye!',
    };
  }),
});

export const authorizedProcedure = publicProcedure
  .input(z.object({ townName: z.string() }))
  .use((opts) => {
    if (opts.input.townName !== 'Pucklechurch') {
      throw new TRPCError({
        code: 'FORBIDDEN',
        message: "We don't take kindly to out-of-town folk",
      });
    }
 
    return opts.next();
  });
 
export const appRouter = t.router({
  hello: authorizedProcedure.query(() => {
    return {
      message: 'hello world',
    };
  }),
  goodbye: authorizedProcedure.mutation(async (opts) => {
    await opts.ctx.signGuestBook();
 
    return {
      message: 'goodbye!',
    };
  }),
});

here in goodbye route , where does the opts object come from , in authorized proccesor middleware , i get it otps come from the input but in goodbye i am not able to understand where opts come from , maybe

  return opts.next();

  return opts.next();

passes it to the goodbye route

AGAyush Goyal

6/10/2023

or maybe i got it , opt.next() redirects us to the next route or middleware and since it has no middleware it direacts us to the next route right , also every opts has three parameters , input , context and next , sure we have not defined input so we can not use it but we can use context and next

Nnlucas

6/10/2023

Opts is just a bundle of stuff that we give middlewares and procedures Everything is just a middleware though, your procedure is just the terminating middleware, so calling next calls whatever is next in the chain, be it a middleware or a procedure. But the opts object is composed automatically under the hood

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