gqlgen golang graphql server 基本试用

go get -u github.com/vektah/gqlgen

type Todo {
id: ID!
text: String!
done: Boolean!
user: User!
}
type User {
id: ID!
name: String!
}
type Query {
todos: [Todo!]!
}
input NewTodo {
text: String!
userId: String!
}
type Mutation {
createTodo(input: NewTodo!): Todo!
}

package model
// User user info
type User struct {
 ID string
 Name string
}

package model
// Todo todo ino
type Todo struct {
 ID string
 Text string
 Done bool
 UserID string
}

schema: schema.graphql
exec:
 filename: graph/generated.go
model:
 filename: model/generated.go
models:
 Todo:
 model: github.com/rongfengliang/gqlgen-app/model.Todo
 User:
 model: github.com/rongfengliang/gqlgen-app/model.User

gqlgen

package graph
import (
 "context"
 "fmt"
 "math/rand"
 model "github.com/rongfengliang/gqlgen-app/model"
)
type App struct {
 todos []model.Todo
}
func (a *App) Mutation() MutationResolver {
 return &mutationResolver{a}
}
func (a *App) Query() QueryResolver {
 return &queryResolver{a}
}
func (a *App) Todo() TodoResolver {
 return &todoResolver{a}
}
type queryResolver struct{ *App }
func (a *queryResolver) Todos(ctx context.Context) ([]model.Todo, error) {
 return a.todos, nil
}
type mutationResolver struct{ *App }
func (a *mutationResolver) CreateTodo(ctx context.Context, input model.NewTodo) (model.Todo, error) {
 todo := model.Todo{
 Text: input.Text,
 ID: fmt.Sprintf("T%d", rand.Int()),
 UserID: input.UserId,
 }
 a.todos = append(a.todos, todo)
 return todo, nil
}
type todoResolver struct{ *App }
func (a *todoResolver) User(ctx context.Context, it *model.Todo) (model.User, error) {
 return model.User{ID: it.UserID, Name: "user " + it.UserID}, nil
}

package main
import (
 "fmt"
 "log"
 "net/http"
 "github.com/rongfengliang/gqlgen-app/graph"
 "github.com/vektah/gqlgen/handler"
)
func main() {
 http.Handle("/", handler.Playground("Todo", "/query"))
 http.Handle("/query", handler.GraphQL(graph.NewExecutableSchema(&graph.App{})))
 fmt.Println("Listening on :8080")
 log.Fatal(http.ListenAndServe(":8080", nil))
}

go run main.go

dep init 

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