Theo's Typesafe CultTTC
Theo's Typesafe Cult•3y ago
Piotrek

Prisma extensions and i18n

Hello!

I have an issue with creating an extension that would append a computed field based on relations.

I read in the docs that adding anything besides scalars to the needs field is impossible, so I wanted to take another approach and append relations using 1 extension. Next, I would use them in a second extension.

However, they still don't show up in the needs field. How do i utilise the relations to create an extension appending a computed field?

What I want to is basically: take the metadata with model's name based on the locale (from the metadatas relation) and append that name as a computed field.

Here's my code snippet that doesn't work:
export const prisma = (locale: Locale) =>
  new PrismaClient({
    log:
      process.env.NODE_ENV === "development"
        ? ["query", "error", "warn"]
        : ["error"],
  })
    .$extends({
      name: "i18n-queries",
      query: {
        allergen: {
          findMany: async ({ query, args }) => {
            return await query({
              ...args,
              include: {
                metadatas: {
                  select: { name: true, description: true, locale: true },
                },
              },
            });
          },
          // the same for other methods
        },
      },
    })
    .$extends({
      name: "i18n-fields",
      result: {
        allergen: {
          name: {
            needs: { metadatas: true }, // this doesn't work
            compute: (allergen) => {
              return ""; // compute the value
            },
          },
        },
      },
    });
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