Sorry, there was a problem running the beginner example and I don't know how to solve it

[多啦b梦]

package main

import (
	"context"
	"database/sql"
	"log"
	"net/http"

	"github.com/dosco/graphjin/core/v3"
	"github.com/go-chi/chi/v5"
	_ "github.com/jackc/pgx/v5/stdlib"
)

func main() {
	// 连接到数据库
	db, err := sql.Open("pgx", "postgres://postgres:@localhost:5432/example_db")
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()

	// 创建 GraphJin 实例
	gj, err := core.NewGraphJin(nil, db)
	if err != nil {
		log.Fatal(err)
	}

	// 定义 GraphQL 查询
	query := `
		query getPosts {
			posts {
				id
				title
			}
			posts_cursor
		}`

	// 创建路由
	r := chi.NewRouter()

	// 定义路由处理程序
	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
		c := context.WithValue(r.Context(), core.UserIDKey, 1)
		res, err := gj.GraphQL(c, query, nil, nil)
		if err != nil {
			log.Println(err)
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}
		w.Write(res.Data)
	})

	// 启动服务器
	log.Println("Starting server on port 3000")
	err = http.ListenAndServe(":3000", r)
	if err != nil {
		log.Fatal(err)
	}
}

Where the problem occurred

gj, err := core.NewGraphJin(nil, db)

Thrown an exception and I don't know how to solve it

[Spacy]

whats the exception can you paste it here?

[多啦b梦]

Throw a pointer error my go verstion 1.20

[多啦b梦]

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0xd8 pc=0x13b73d8]

goroutine 1 [running]:
github.com/dosco/graphjin/core/v3.getFS(0x10fc5a6?)
/Users//go/pkg/mod/github.com/dosco/graphjin/core/v3@v3.0.0-20230512210738-36d89904d6e1/api.go:542 +0x18
github.com/dosco/graphjin/core/v3.NewGraphJin(0x16a50de?, 0x3?, {0x0, 0x0, 0x0})
/Users//go/pkg/mod/github.com/dosco/graphjin/core/v3@v3.0.0-20230512210738-36d89904d6e1/api.go:91 +0x3f
main.main()
/Users//Desktop/goproject/graphjintest/main.go:20 +0x7d

[多啦b梦]

package main

import (
	"context"
	"database/sql"
	"github.com/dosco/graphjin/core/v3"
	"github.com/go-chi/chi/v5"
	_ "github.com/jackc/pgx/v5/stdlib"
	"log"
	"net/http"
)

func main() {
	// 连接到数据库
	db, err := sql.Open("pgx", "postgres://postgres:@localhost:5432/mydb")
	if err != nil {
		panic(err)
	}
	defer db.Close()
	// 创建 GraphJin 实例
	gj, err := core.NewGraphJin(&core.Config{
		SecretKey:            "",
		DisableAllowList:     false,
		EnableSchema:         false,
		EnableIntrospection:  false,
		SetUserID:            false,
		DefaultBlock:         false,
		Vars:                 nil,
		HeaderVars:           nil,
		Blocklist:            nil,
		Resolvers:            nil,
		Tables:               nil,
		RolesQuery:           "",
		Roles:                nil,
		DBType:               "",
		Debug:                false,
		SubsPollDuration:     0,
		DefaultLimit:         0,
		DisableAgg:           false,
		DisableFuncs:         false,
		EnableCamelcase:      false,
		Production:           false,
		DBSchemaPollDuration: 0,
		DisableProdSecurity:  false,
		FS:                   nil,
	}, db)
	if err != nil {
		log.Fatal(err)
	}

	// 定义 GraphQL 查询
	query := `
		query {
		  articles() {
			id
			title
			content
		  }
		}`

	// 创建路由
	r := chi.NewRouter()

	// 定义路由处理程序
	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
		c := context.WithValue(r.Context(), core.UserIDKey, 1)
		res, err := gj.GraphQL(c, query, nil, nil)
		if err != nil {
			log.Println(err)
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}
		w.Write(res.Data)
	})

	// 启动服务器
	log.Println("Starting server on port 3000")
	err = http.ListenAndServe(":3000", r)
	if err != nil {
		log.Fatal(err)
	}
}

I found a solution

gj, err := core.NewGraphJin(&core.Config{
		SecretKey:            "",
		DisableAllowList:     false,
		EnableSchema:         false,
		EnableIntrospection:  false,
		SetUserID:            false,
		DefaultBlock:         false,
		Vars:                 nil,
		HeaderVars:           nil,
		Blocklist:            nil,
		Resolvers:            nil,
		Tables:               nil,
		RolesQuery:           "",
		Roles:                nil,
		DBType:               "",
		Debug:                false,
		SubsPollDuration:     0,
		DefaultLimit:         0,
		DisableAgg:           false,
		DisableFuncs:         false,
		EnableCamelcase:      false,
		Production:           false,
		DBSchemaPollDuration: 0,
		DisableProdSecurity:  false,
		FS:                   nil,
	}, db)

The reason is because of your introductory example

gj, err := core.NewGraphJin(nil, db)

If only the beginner were more friendly thank you