Prisma1: Error when using prisma.$exists

[richardkall]

Describe the bug
When using the prisma.$exists method, prisma-client-lib throws an error.

To Reproduce
Steps to reproduce the behavior:

1. Set up the example: https://github.com/prisma/prisma-examples/tree/master/typescript-graphql
2. Change a resolver to use $exists, for example Query.ts:

export const Query: IQuery.Resolver<Types> = {
  masters: async (root, args, ctx) => {
    const exists = await ctx.db.$exists.master({ id: "test" });
    console.log(exists);
    return ctx.db.masters();
  }
};

1. Start server, and run the masters query.
2. See error:

Error: Invalid exist query: masters
    at Object.buildExistsInfo (/Users/.../prisma-examples/typescript-graphql/node_modules/prisma-client-lib/src/info.ts:289:11)

Expected behavior
To console log a boolean and continue within the resolver.

Versions (please complete the following information):

• Prisma CLI: prisma/1.17.0-beta.2 (darwin-x64) node-v8.11.4
• Prisma Server: 1.17-beta-1

[divyenduz]

Fixed via https://github.com/prisma/prisma/commit/cd53fc8eba010df60c56f3b5c9131ed12392e3ed

I can confirm that I am no longer able to reproduce. This is available in the latest beta npm install -g prisma@beta.

[divyenduz]

This is now in stable (1.17). Please use npm install -g prisma to update the CLI.