Adding nexus-prisma to an existing project.

[milovangudelj]

Hi everyone!

I have a project I'm working on and I'm using Nexus intensively.
I started a while ago following along with Mahmoud and his full-stack app with Next.js, GraphQL, TypeScript & Prisma YouTube series.

Now I want to add nexus-prisma to the mix but I cannot find a way to do it. When using nexus-prisma something goes wrong with the schema creation and ApolloClient starts throwing reference errors about it.
More specifically this shows up in the console: error - ReferenceError: Cannot access 'schema' before initialization. Here schema comes from my schema.ts file in which I export a NexusGraphQLSchema generated by makeSchema.

I don't understand what's happening and since this is still in preview I couldn't find anything on how to solve the issue.
If I go back to using plain Nexus code it all works like a charm.

I was really excited about the plugin since it simplifies a LOT the code necessary to define the schema.

If you decide to help me let me know if you need some more info or anything.

Have a beautiful day!

[milovangudelj]

Ok, so... A little update.

I've managed to successfully add nexus-prisma to my project and it correctly generates the graphql api. Now the only problem I have is that I need to be able to query many-to-many relations and as of right now this seems to not be supported (it's in the midterm section of the roadmap).

And if I try to make a nested query like so:

query Course($courseId: String!) {
  course(id: $courseId) {
    id
    name
    professors {
      id
      name
    }
  }
}

I get an error saying:

{
  "errors": [
    {
      "message": "Expected Iterable, but did not find one for field \"Course.professors\".",
      "locations": ["..."],
      "path": ["..."],
      "extensions": {"..."}
    }
  ],
  "data": {
    "course": {
      "id": "5ed295b7-92b8-4089-af88-54ecf024b486",
      "name": "Databases 1",
      "professors": null
    }
  }
}

My Professor query resolvers look like this:

// Professor.ts

export const ProfessorQueries = extendType({
   type: "Query",
   definition(t) {
      t.nonNull.list.nonNull.field("professors", {
         type: "Professor",
         async resolve(_, __, ctx) {
            return await ctx.prisma.professor.findMany();
         },
      });
   },
});

Now, I'm not 100% sure that i'm not doing something wrong. But after watching Jason's presentation at GraphQL Berlin Meetup #25 it looks like I'm doing the same thing as he did in that talk.

I'm patiently waiting for the first fully featured version of the plugin and I have really high hopes about it.

In the meantime I'll be looking for a way around the problem and maybe I'll post updates here.