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Salman Ahmad
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Added example and fixed bug
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‎example/social/README.md

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### Social App
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A simple example of how to use struct fields as resolvers instead of methods.
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To run this server
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`go ./example/field-resolvers/server/server.go`
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and go to localhost:9011 to interact

‎example/social/server/server.go

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package main
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import (
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"log"
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"net/http"
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"github.com/graph-gophers/graphql-go"
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"github.com/graph-gophers/graphql-go/config"
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"github.com/graph-gophers/graphql-go/example/social"
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"github.com/graph-gophers/graphql-go/relay"
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)
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var schema *graphql.Schema
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func init() {
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schema = graphql.MustParseSchema(social.Schema, &social.Resolver{}, &config.Config{UseResolverMethods: false})
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}
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func main() {
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http.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.Write(page)
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}))
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http.Handle("/query", &relay.Handler{Schema: schema})
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log.Fatal(http.ListenAndServe(":9011", nil))
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}
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var page = []byte(`
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<!DOCTYPE html>
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<html>
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<head>
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<link href="https://cdnjs.cloudflare.com/ajax/libs/graphiql/0.11.11/graphiql.min.css" rel="stylesheet" />
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<script src="https://cdnjs.cloudflare.com/ajax/libs/es6-promise/4.1.1/es6-promise.auto.min.js"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/fetch/2.0.3/fetch.min.js"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.2.0/umd/react.production.min.js"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.2.0/umd/react-dom.production.min.js"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/graphiql/0.11.11/graphiql.min.js"></script>
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</head>
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<body style="width: 100%; height: 100%; margin: 0; overflow: hidden;">
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<div id="graphiql" style="height: 100vh;">Loading...</div>
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<script>
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function graphQLFetcher(graphQLParams) {
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return fetch("/query", {
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method: "post",
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body: JSON.stringify(graphQLParams),
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credentials: "include",
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}).then(function (response) {
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return response.text();
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}).then(function (responseBody) {
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try {
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return JSON.parse(responseBody);
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} catch (error) {
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return responseBody;
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}
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});
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}
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ReactDOM.render(
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React.createElement(GraphiQL, {fetcher: graphQLFetcher}),
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document.getElementById("graphiql")
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);
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</script>
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</body>
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</html>
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`)

‎example/social/social.go

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package social
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import (
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"context"
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"errors"
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"fmt"
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)
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const Schema = `
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schema {
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query: Query
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}
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type Query {
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admin(id: ID!, role: Role = ADMIN): Admin!
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user(id: ID!): User!
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}
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interface Admin {
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id: ID!
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name: String!
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role: Role!
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}
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type User implements Admin {
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id: ID!
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name: String!
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email: String!
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role: Role!
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phone: String!
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address: [String!]
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friends(page: Pagination): [User]
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}
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input Pagination {
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first: Int
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last: Int
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}
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enum Role {
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ADMIN
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USER
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}
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`
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type page struct {
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First *int
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Last *int
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}
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type admin interface {
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IdResolver() string
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NameResolver() string
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RoleResolver() string
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}
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type user struct {
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Id string
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Name string
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Role string
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Email string
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Phone string
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Address *[]string
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Friends *[]*user
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}
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func (u user) IdResolver() string {
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return u.Id
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}
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func (u user) NameResolver() string {
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return u.Name
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}
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func (u user) RoleResolver() string {
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return u.Role
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}
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func (u user) FriendsResolver(args struct{ Page *page }) (*[]*user, error) {
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from := 0
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numFriends := len(*u.Friends)
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to := numFriends
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if args.Page != nil {
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if args.Page.First != nil {
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from = *args.Page.First
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}
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if args.Page.Last != nil {
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to = *args.Page.Last
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if to > numFriends {
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to = numFriends
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}
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}
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}
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friends := (*u.Friends)[from:to]
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return &friends, nil
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}
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var users = []*user{
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{
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Id: "0x01",
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Name: "Albus Dumbledore",
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Role: "ADMIN",
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Email: "[email protected]",
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Phone: "000-000-0000",
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Address: &[]string{"Office @ Hogwarts", "where Horcruxes are"},
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},
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{
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Id: "0x02",
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Name: "Harry Potter",
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Role: "USER",
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Email: "[email protected]",
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Phone: "000-000-0001",
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Address: &[]string{"123 dorm room @ Hogwarts", "456 random place"},
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},
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{
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Id: "0x03",
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Name: "Hermione Granger",
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Role: "USER",
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Email: "[email protected]",
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Phone: "000-000-0011",
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Address: &[]string{"233 dorm room @ Hogwarts", "786 @ random place"},
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},
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{
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Id: "0x04",
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Name: "Ronald Weasley",
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Role: "USER",
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Email: "[email protected]",
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Phone: "000-000-0111",
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Address: &[]string{"411 dorm room @ Hogwarts", "981 @ random place"},
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},
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}
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var usersMap = make(map[string]*user)
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func init() {
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users[0].Friends = &[]*user{users[1]}
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users[1].Friends = &[]*user{users[0], users[2], users[3]}
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users[2].Friends = &[]*user{users[1], users[3]}
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users[3].Friends = &[]*user{users[1], users[2]}
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for _, usr := range users {
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usersMap[usr.Id] = usr
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}
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}
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type Resolver struct{}
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func (r *Resolver) Admin(ctx context.Context, args struct {
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Id string
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Role string
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}) (admin, error) {
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if usr, ok := usersMap[args.Id]; ok {
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if usr.Role == args.Role {
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return *usr, nil
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}
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}
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err := fmt.Sprintf("user with id=%s and role=%s does not exist", args.Id, args.Role)
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return user{}, errors.New(err)
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}
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func (r *Resolver) User(ctx context.Context, args struct{ Id string }) (user, error) {
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if usr, ok := usersMap[args.Id]; ok {
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return *usr, nil
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}
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err := fmt.Sprintf("user with id=%s does not exist", args.Id)
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return user{}, errors.New(err)
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}

‎internal/exec/exec.go

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@@ -192,7 +192,12 @@ func execFieldSelection(ctx context.Context, r *Request, f *fieldToExec, path *p
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return err
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}
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} else {
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result = f.resolver.Field(f.field.FieldIndex)
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// TODO extract out unwrapping ptr logic to a common place
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res := f.resolver
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if res.Kind() == reflect.Ptr {
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res = res.Elem()
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}
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result = res.Field(f.field.FieldIndex)
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}
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return nil

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