CODEWITHSUNDEEP
javascriptgraphqlgraphql-js
Tim Scott
Tim Scott

Reputation: 15205

Cyclic GraphQL Schema Not Working

I have like this:

//driverType.js
module.exports = new GraphQLObjectType({
  name: 'Driver',
  fields: () => ({
    homeTerminal: {
      type: TerminalType,
      resolve: resolver(User.HomeTerminal)
    }
  })
});

and this:

//terminalType.js
module.exports = new GraphQLObjectType({
  name: 'Terminal',
  fields: () => ({
    drivers: {
      type: new GraphQLList(DriverType),
      resolve: resolver(Terminal.Drivers)
    }
  })
});

I get the error:

Error: Schema must contain unique named types but contains multiple types named "Driver".

I found some posts that say that wrapping the fields in a function block will solve it, but as you can see I did that, and it didn't make a difference.

Thins kind of cyclic reference should be supported, yes? We can let the client will specify the desired depth.

What am I doing wrong?

As a workaround, I could remove homeTerminal from DriverType and flatten it with primitive fields, but that's rather inelegant.

Upvotes: 2

Views: 669

Answers (1)

Tim Scott
Tim Scott

Reputation: 15205

I found the problem. In terminalType.js I had:

import DriverType from './DriverType';

Should be:

import DriverType from './driverType';

Lower case "d" is correct.

UPDATE

Here's what I think is happening. Nodejs caches imports. So importing the same file multiple times always returns the same instance. However, I believe that, while import is not case-sensitive caching is. So calling with a different case on the filename returns a new and different instance.

Upvotes: 1

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