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github.com/dagger/graphql-go-tools

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github.com/dagger/graphql-go-tools

  • v0.0.0-20231012004527-77189e400b6e
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graphql-go-tools

Like apollo-tools for graphql-go

Current Tools

MakeExecutableSchema

Currently supports:

  • Merge multiple graphql documents
  • Object type extending
  • Custom Directives
  • Import types and directives

Planned:

  • Schema-stitching

Limitations:

  • Only types and directives defined in the TypeDefs with schema language can be extended and have custom directives applied.

Example

func main() {
  schema, err := tools.MakeExecutableSchema(tools.ExecutableSchema{
    TypeDefs: `
    directive @description(value: String!) on FIELD_DEFINITION

    type Foo {
      id: ID!
      name: String!
      description: String
    }
    
    type Query {
      foo(id: ID!): Foo @description(value: "bazqux")
    }`,
    Resolvers: tools.ResolverMap{
      "Query": &tools.ObjectResolver{
        Fields: tools.FieldResolveMap{
          "foo": &tools.FieldResolver{
            Resolve: func(p graphql.ResolveParams) (interface{}, error) {
              // lookup data
              return foo, nil
            }
          },
        },
      },
    },
    SchemaDirectives: tools.SchemaDirectiveVisitorMap{
      "description": &tools.SchemaDirectiveVisitor{
        VisitFieldDefinition: func(field *graphql.Field, args map[string]interface{}) {
          resolveFunc := field.Resolve
          field.Resolve = func(p graphql.ResolveParams) (interface{}, error) {
            result, err := resolveFunc(p)
            if err != nil {
              return result, err
            }
            data := result.(map[string]interface{})
            data["description"] = args["value"]
            return data, nil
          }
        },
      },
    },
  })

  if err != nil {
    log.Fatalf("Failed to build schema, error: %v", err)
  }

  params := graphql.Params{
    Schema: schema,
    RequestString: `
    query GetFoo {
      foo(id: "5cffbf1ccecefcfff659cea8") {
        description
      }
    }`,
  }

  r := graphql.Do(params)
  if r.HasErrors() {
		log.Fatalf("failed to execute graphql operation, errors: %+v", r.Errors)
	}
	rJSON, _ := json.Marshal(r)
	fmt.Printf("%s \n", rJSON)
}

Handler

Modified graphql-go/handler with updated GraphiQL and Playground

See handler package

FAQs

Package last updated on 12 Oct 2023

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