Gqlgen: The sample code in getting started cannot be compiled

[ksoda]

What happened?

The following command failed. This happens when you implement the code according to Implement the resolvers

❯ go run server.go
graph/schema.resolvers.go:18:36: not enough arguments in call to "crypto/rand".Int
        have ()
        want (io.Reader, *big.Int)
graph/schema.resolvers.go:18:36: multiple-value "crypto/rand".Int() in single-value context

What did you expect?

The server is successfully started.

Minimal graphql.schema and models to reproduce

graphql.schema and models

# GraphQL schema example
#
# https://gqlgen.com/getting-started/

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!
}

// Code generated by github.com/99designs/gqlgen, DO NOT EDIT.

package model

type NewTodo struct {
    Text   string `json:"text"`
    UserID string `json:"userId"`
}

type Todo struct {
    ID   string `json:"id"`
    Text string `json:"text"`
    Done bool   `json:"done"`
    User *User  `json:"user"`
}

type User struct {
    ID   string `json:"id"`
    Name string `json:"name"`
}

versions

• gqlgen version: v0.11.3
• go version: go version go1.13.8 linux/amd64
• dep or go modules?

[ksoda]

This patch makes it boot up.

diff --git a/server-next/graph/schema.resolvers.go b/server-next/graph/schema.resolvers.go
index d14d5d1..ffa99c8 100644
--- a/server-next/graph/schema.resolvers.go
+++ b/server-next/graph/schema.resolvers.go
@@ -7,15 +7,18 @@ import (
        "context"
        "crypto/rand"
        "fmt"
+       "math/big"

        "github.com/ksoda/todo-app/graph/generated"
        "github.com/ksoda/todo-app/graph/model"
 )

 func (r *mutationResolver) CreateTodo(ctx context.Context, input model.NewTodo) (*model.Todo, error) {
+       rand, _ := rand.Int(rand.Reader, big.NewInt(100))
        todo := &model.Todo{
+
                Text: input.Text,
-               ID:   fmt.Sprintf("T%d", rand.Int()),
+               ID:   fmt.Sprintf("T%d", rand),
                User: &model.User{ID: input.UserID, Name: "user " + input.UserID},
        }
        r.todos = append(r.todos, todo)

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[hayashi-ay]

Simply import "math/rand" instead of "crypto/rand"