我想对相册进行更新变更,但是我在获取更新和获取返回值时遇到问题。
Schema Mongoose:
var AlbumSchema = new Schema({
name: String,
dateCreated: { type: Date, default: Date.now },
dateUpdated: { type: Date, default: Date.now }
});
GraphQL类型:
const AlbumType = new GraphQLObjectType({
name: 'Album',
fields: () => ({
id: {type:GraphQLID},
name: {type:GraphQLString},
dateCreated: {type: GraphQLString},
dateUpdated: {type: GraphQLString}
})
})
更新变异:
updateAlbum: { //STILL TRYING TO GET TO WORK
type: AlbumType,
args: {
id: {type: new GraphQLNonNull(GraphQLString)},
name: {type: new GraphQLNonNull(GraphQLString)}
},
resolve(parentValue, args){
return new Promise((resolve, reject) => {
ALBUM.findOneAndUpdate(
{id: args.id},
{name: args.name},
//{dateUpdated: Date.now()}
).exec((err, res) => {
if(err) reject(err)
else resolve()
})
})
}
}
测试突变:
mutation {
updateAlbum(id:"5a695c586c050802f182270c", name: "album 333"){
id
name }}
测试突变的响应:
{
"data": {
"updateAlbum": null
}
}
问题:
我应该如何编写updateAlbum
函数?
(不太重要)如何添加Date.now()
以获取新的dateUpdated:
值?
如何获得返回值或者我能得到的回复是updateAlbum: null
?谢谢!
答案 0 :(得分:0)
见下文。您需要添加“$ set”来放置您将要更改的参数集。
updateAlbum: {
type: AlbumType,
args: {
id: {type: new GraphQLNonNull(GraphQLString)},
name: {type: new GraphQLNonNull(GraphQLString)}
},
resolve(parentValue, args){
return new Promise((resolve, reject) => {
const date = Date().toString()
ALBUM.findOneAndUpdate(
{"_id": args.id},
{ "$set":{name: args.name, dateUpdated: date}},
{"new": true} //returns new document
).exec((err, res) => {
console.log('test', res)
if(err) reject(err)
else resolve(res)
})
})
}
}
日期需要变成一个字符串,与Date()而不是Date.now()一起保留,与mongoose格式保持一致。
res
添加到resolve()