Theo's Typesafe Cult•16mo ago

Is it possible to pass down a generic to my TRPC API route (procedure)?

From my front end, I need to pass a generic down to my TRPC procedure. Is this possible? The reason is because the fn that runs within the procedure will change the return types based on the generic it receives.

6 Replies

Brendonovich•16mo ago

Nah you can’t have generic procedures, that’s a bit out of typescript’s ability

DYELbrah•16mo ago

Dang, so lets say I want to call this function that's usable to fetch data from multiple tables such as:

      const getTableData = async <T>({
        tableName,
        columns,
      }: SearchInput<T>) => {
        const { data } = await supabase
          .from(tableName)
          .select(columns.join(","));
        return data;
      };

      const getTableData = async <T>({
        tableName,
        columns,
      }: SearchInput<T>) => {
        const { data } = await supabase
          .from(tableName)
          .select(columns.join(","));
        return data;
      };

Will I basically have to break it down into an individual function for each table? Probably a router/procedure for each individual table/set I need?

Brendonovich•16mo ago

You’ll need multiple procedures but can reuse that function in them

DYELbrah•16mo ago

Thanks! I'm not too sure what you mean, I'm thinking I'll have to just hardcode the table name/columns? So instead of having a customer search any table endpoint, I'll have an endpoint (procedure) for each one. Especially if I don't want to break the typesafety Without passing the generics, the types returned from my calls are set to any[] sadly

Brendonovich•16mo ago

You’ll need to provide the generics each time you use it, since the retuned types will be different everytime

DYELbrah•16mo ago

Ohhh nice that's a good point I can hardcode the generic

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Is it possible to pass down a generic to my TRPC API route (procedure)?