Extending schema types with custom plugin results error

[genert]

First of all, I would to start by saying this project is great, and have used it for many years now in production systems, so thank you for your effort!

---

We are extending the library through internal plugin that adds types into GraphQL schema without developers writing it by themselves.

The first use case of this is filter generation. For example, lets say there is a type with fields which some of have search directive attached:

type MyModel {
    id: ID!
    name: String! @search
    createdAt: Date! @search
}

The plugin finds these fields, and generates inputs for filtering.

We have gotten that far that we mutate the schema, and successfully add the types.

However, we get following error:

merging type systems failed: unable to build object definition: unable to find type go.ourcompany.com/ourproject/graphql/generatedmodel.PolygonGeoFilter

What are we missing? Do we need to do anything else other than call cfg.Models.Add?

The plugin's MutateConfig method contains following code:

for _, schemaType := range cfg.Schema.Types {
	if cfg.Models.UserDefined(schemaType.Name) {
		continue
	}
	switch schemaType.Kind {
	case ast.Object, ast.InputObject:
		if schemaType == cfg.Schema.Query || schemaType == cfg.Schema.Mutation || schemaType == cfg.Schema.Subscription {
			continue
		}

		if !cfg.Models.Exists(schemaType.Name) {
			cfg.Models.Add(schemaType.Name, cfg.Model.ImportPath()+"."+templates.ToGo(schemaType.Name))
		}
	}
}

The generator main code is following:

func main() {
	if err := os.Remove(fileName); err != nil && !os.IsNotExist(err) {
		_, _ = fmt.Fprintln(os.Stderr, "failed to delete generated file", err.Error())
		os.Exit(2)
	}

	cfg, err := config.LoadConfigFromDefaultLocations()
	if err != nil {
		_, _ = fmt.Fprintln(os.Stderr, "failed to load config", err.Error())
		os.Exit(2)
	}

	err = api.Generate(cfg,
		api.NoPlugins(),
		api.AddPlugin(internal.New()), // Our custom plugin
		api.AddPlugin(modelgen.New()),
		api.AddPlugin(resolvergen.New()),
	)
	if err != nil {
		_, _ = fmt.Fprintln(os.Stderr, err.Error())
		os.Exit(3)
	}
}

What are we missing?

versions

• gqlgen version 0.13
• go version 1.16
• go modules