1
在我的應用程序的NodeJS讀「後」的未定義的屬性不能實施反應繼電器
這裏是我的schema.js文件
import {
GraphQLBoolean,
GraphQLID,
GraphQLInt,
GraphQLList,
GraphQLNonNull,
GraphQLObjectType,
GraphQLSchema,
GraphQLString,
} from 'graphql';
import {
connectionArgs,
connectionDefinitions,
connectionFromArray,
connectionFromPromisedArray,
cursorForObjectInConnection,
fromGlobalId,
globalIdField,
mutationWithClientMutationId,
nodeDefinitions,
toGlobalId,
} from 'graphql-relay';
import {
User,
getUser,
getPosts,
createpost,
} from '../data/database.js';
var { nodeInterface, nodeField } = nodeDefinitions(
(globalId) => {
var { type, id } = fromGlobalId(globalId);
if (type === 'User') {
return getUser(id);
}else if (type === 'Post') {
return getPosts(id);
}
return null;
},
(obj) => {
if (obj instanceof User) {
return userType;
}else if (obj instanceof Post) {
return postType;
}
return null;
}
);
var userProfileImageType = new GraphQLObjectType({
name: 'ProfileImage',
fields: {
full: {
type: GraphQLString
}
}
});
var userLocalAccountType = new GraphQLObjectType({
name: 'Local',
fields: {
email: {
type: GraphQLString
}
}
});
var userFacebookAccountType = new GraphQLObjectType({
name: 'Facebook',
fields: {
id: {
type: GraphQLString
},
displayName: {
type: GraphQLString
}
}
});
var userGoogleAccountType = new GraphQLObjectType({
name: 'Google',
fields: {
id: {
type: GraphQLString
},
displayName: {
type: GraphQLString
}
}
});
var postType = new GraphQLObjectType({
name: 'Post',
fields: {
id: globalIdField('Post'),
title: {
type: GraphQLString
},
userId: globalIdField('User'),
content: {
type: GraphQLString
}
},
interfaces: [nodeInterface]
});
/**
* Define your own connection types here
*/
const {
connectionType: postConnection,
edgeType: postEdge,
} = connectionDefinitions({name: 'Post', nodeType: postType});
let createPostMutation = mutationWithClientMutationId({
name: 'CreatePost',
inputFields: {
title: { type: new GraphQLNonNull(GraphQLString) },
content: { type: new GraphQLNonNull(GraphQLString) },
userId: { type: new GraphQLNonNull(GraphQLString) },
},
outputFields: {
postEdge: {
type: postConnection,
resolve: (obj) => ({ node: obj, cursor: obj.insertedId })
},
},
mutateAndGetPayload: ({title, content,userId}) => {
console.log({title, content,userId})
return createpost({title, content,userId})
}
});
var userType = new GraphQLObjectType({
name: 'User',
fields: {
id: globalIdField('User'),
fullName: {
type: GraphQLString,
description: "Users' Full Name"
},
isPremium: {
type: GraphQLBoolean,
description: "Does the user have premium subscription?"
},
currentPostCount: {
type: GraphQLInt,
description: "User's current total post"
},
images: {
type: userProfileImageType,
description: "User's profile image links"
},
local: {
type: userLocalAccountType,
description: "User's local account info"
},
facebook: {
type: userFacebookAccountType,
description: "User's Facebook account info"
},
google: {
type: userGoogleAccountType,
description: "User's Google Plus account info"
},
posts: {
type: postConnection,
args: {
...connectionArgs,
query: { type: GraphQLString }
},
resolve: (rootValue) => {
return connectionFromPromisedArray(getPosts(rootValue))
}
},
},
interfaces: [nodeInterface]
});
var Root = new GraphQLObjectType({
name: 'Root',
fields:() => ({
user: {
type: userType,
resolve: (rootValue, _) => {
return getUser(rootValue)
}
},
})
})
export var schema = new GraphQLSchema({
query: Root,
mutation: new GraphQLObjectType({
name: 'Mutation',
fields:() => ({
createPost: createPostMutation
})
})
});
以下是我的database.js
import User from './models/userModel'
import Post from './models/postModel'
export { User }
export { Post }
export function getUser(user) {
let validUser = false
if (user.local || user.facebook || user.google) {
validUser = true
}
return new Promise((resolve, reject) => {
if (validUser) {
let localEmail = user.local.email || ""
let googleID = user.google.id || ""
let facebookID = user.facebook.id || ""
User.findOne({
$or: [
{ "local.email": localEmail },
{ "facebook.id": facebookID },
{ "google.id": googleID }
]
}, function(err, existingUser) {
if (err || !existingUser) {
resolve({})
} else {
resolve(existingUser)
}
});
} else {
resolve({})
}
})
}
export function getPosts(user) {
return new Promise((resolve, reject) => {
Post.find({}).exec({}, function(err, posts) {
resolve(posts)
});
})
}
export function createpost({title, content,userId}){
return new Promise((resolve, reject) => {
const blogPostModel = new Post({title, content,userId});
const newBlogPost = blogPostModel.save();
if (!newBlogPost) {
throw new Error('Error adding new blog post');
}
resolve({})
})
}
我正在通過
獲取用戶Relay.QL `query { user}`
我想與用戶
Relay.QL 'query{
user {
id,
posts(first: 3) {
edges {
node {
id,
title
}
}
}
}
}'
一起獲取所有職位，但我在終端
Failed to execute query `UserQueries` for the following reasons:
1. Cannot read property 'after' of undefined
le {id,displayName},_posts3KBCho:posts(first:3) {edges {node
請幫助得到下面的錯誤。 在此先感謝。
感謝您的回覆。但我試過，也已經我控制檯日誌getPosts（），我得到的職位列出他們的。仍然會出現同樣的錯誤。 1.無法讀取屬性''之後'未定義 - \t標誌 \t 或有時會出現錯誤....不能爲非空字段PostConnection.pageInfo返回null。le，content}，cursor}，pageInfo {hasNextPage，hasPreviousPage}}} – ajooba
您沒有在'schema.js'文件中導入'Post'。導入「Post」後會發生什麼？ –
它沒有任何區別，因爲getposts從database.js導入並導入POST。 – akshay