Golang graphql架构字段无法返回数组
尝试从graphql查询获取数组时收到此错误:Golang graphql架构字段无法返回数组,go,graphql,Go,Graphql,尝试从graphql查询获取数组时收到此错误: "User Error: expected iterable, but did not find one for field RootQuery.blogpostsBetween." 这很奇怪,因为就在几周前,我的字段配置如下,它工作得非常好: "blogpostsBetween": &graphql.Field{ Type: graphql.NewList(blogpostType), Resolve: func(p g
"User Error: expected iterable, but did not find one for field RootQuery.blogpostsBetween."
这很奇怪,因为就在几周前,我的字段配置如下,它工作得非常好:
"blogpostsBetween": &graphql.Field{
Type: graphql.NewList(blogpostType),
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
// ... some more code ...
// what I return here was placed to demonstrate the error.
return [5]Blogpost{}, err
},
Args: graphql.FieldConfigArgument{
"from": &graphql.ArgumentConfig{
Type: graphql.String,
},
"to": &graphql.ArgumentConfig{
Type: graphql.String,
},
},
},
我真的很困惑为什么这不再有效,因为正如我所说的,我很确定我没有改变任何事情。但我很高兴我错了
编辑:blogpostType的详细信息
var blogpostType = graphql.NewObject(graphql.ObjectConfig{
Name: "Blogpost",
Fields: graphql.Fields{
"id": &graphql.Field{
Type: graphql.String,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
m := p.Source.(Blogpost)
return m.id, nil
},
},
"title": &graphql.Field{
Type: graphql.String,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
m := p.Source.(Blogpost)
return m.title, nil
},
},
"body": &graphql.Field{
Type: graphql.String,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
m := p.Source.(Blogpost)
return m.body, nil
},
},
"created": &graphql.Field{
Type: graphql.String,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
m := p.Source.(Blogpost)
return m.created, nil
},
},
"author": &graphql.Field{
Type: graphql.String,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
m := p.Source.(Blogpost)
return m.author, nil
},
},
},
})
基于您的问题,我假设并添加了一些类型,以使解决方案如下所示。此示例仅查询所选字段
id、title、body、author
package main
import (
"encoding/json"
"fmt"
"log"
"github.com/graphql-go/graphql"
)
var blogpostType = graphql.NewObject(graphql.ObjectConfig{
Name: "Blogpost",
Fields: graphql.Fields{
"id": &graphql.Field{
Type: graphql.String,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
m := p.Source.(Blogpost)
return m.id, nil
},
},
"title": &graphql.Field{
Type: graphql.String,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
m := p.Source.(Blogpost)
return m.title, nil
},
},
"body": &graphql.Field{
Type: graphql.String,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
m := p.Source.(Blogpost)
return m.body, nil
},
},
"created": &graphql.Field{
Type: graphql.String,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
m := p.Source.(Blogpost)
return m.created, nil
},
},
"author": &graphql.Field{
Type: graphql.String,
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
m := p.Source.(Blogpost)
return m.author, nil
},
},
},
})
type Blogpost struct {
id string
title string
body string
created string
author string
}
func main() {
// Schema
fields := graphql.Fields{
"blogpostsBetween": &graphql.Field{
Type: graphql.NewList(blogpostType),
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
// ... some more code ...
// what I return here was placed to demonstrate the error.
return []Blogpost{
Blogpost{
id: "new-post",
title: "new post",
body: "Lorem ipsum",
author: "John Doe",
created: "12.12.2012",
},
}, nil
},
Args: graphql.FieldConfigArgument{
"from": &graphql.ArgumentConfig{
Type: graphql.String,
},
"to": &graphql.ArgumentConfig{
Type: graphql.String,
},
},
},
}
rootQuery := graphql.ObjectConfig{Name: "RootQuery", Fields: fields}
schemaConfig := graphql.SchemaConfig{Query: graphql.NewObject(rootQuery)}
schema, err := graphql.NewSchema(schemaConfig)
if err != nil {
log.Fatalf("failed to create new schema, error: %v", err)
}
// Query
query := `
{
blogpostsBetween {
id,
title,
body,
author
}
}
`
params := graphql.Params{Schema: schema, RequestString: query}
r := graphql.Do(params)
if len(r.Errors) > 0 {
log.Fatalf("failed to execute graphql operation, errors: %+v", r.Errors)
}
rJSON, _ := json.Marshal(r)
fmt.Printf("%s \n", rJSON)
}
您可以添加
blogpostType
的详细信息吗?编辑并添加了blogpostType:)@Aditya SinghI已经添加了一个基于以下更新类型的工作解决方案。谢谢!我明天会检查这是否对我有效,并会让你知道!:)这起作用了。Graphql应该得到一个切片,而不是数组。一个重要的区别!你介意在你的回答中包括变量类型的不同吗?