Prisma•2mo ago

How to derive a type from types generated by Prisma?

Hi, The following TypeScript code snippet is working where I'm able to derive a type X from the query result from Prisma.

const rows = await prisma.role_users.findMany({
  select: {
    users: {
      select: {
        id: true,
        email: true,
      },
    },
    roles: {
      select: {
        members: {
          select: {
            groups: {
              select: {
                id: true,
                name: true,
              },
            },
          },
        },
      },
    },
  },
});

type X = (typeof rows)[number]["users"] & {
  roles: (typeof rows)[number]["roles"]["members"][number]["groups"][];
};

const rows = await prisma.role_users.findMany({
  select: {
    users: {
      select: {
        id: true,
        email: true,
      },
    },
    roles: {
      select: {
        members: {
          select: {
            groups: {
              select: {
                id: true,
                name: true,
              },
            },
          },
        },
      },
    },
  },
});

type X = (typeof rows)[number]["users"] & {
  roles: (typeof rows)[number]["roles"]["members"][number]["groups"][];
};

May I know how to create the type outside of the function instead of defining the type X on runtime in the function? Something like deriving the type from the database table types generated by Prisma and etc?

1 Reply

Nurul•2mo ago

Hello @TJ 👋 Have you seen this section of our docs? https://www.prisma.io/docs/orm/prisma-client/type-safety/operating-against-partial-structures-of-model-types I believe this should be helpful

Operating against partial structures of your model types | Prisma D...

This page documents various scenarios for using the generated types from the Prisma namespace

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Programming

How to derive a type from types generated by Prisma?