所以我试图在graphiql上执行一个变异,但一直收到这个错误:
这是我的设置:
架构:
import { GraphQLInt, GraphQLString, GraphQLList, GraphQLObjectType, GraphQLNonNull, GraphQLSchema, } from 'graphql';
import * as _ from 'lodash';
import mongoose from 'mongoose';
import messageModel from './models/messages';
import userModel from './models/users';
import groupModel from './models/groups';
export const Schema =[`
scalar Date
type Group {
id: String!,
name: String,
created_at:Date!,
users: [User],
messages: [Message]
}
type User {
id: String!,
username: String!,
email: String!,
password: String!,
location: String!,
groups: [Group],
friends: [User]
}
type Message {
id: String!,
to: Group!,
from: User!,
message: String!,
date: Date!
}
type Query {
user(email: String, id: Int): User
messages(groupId: Int, userId: Int): [Message]
group(id: Int!): Group
}
type Mutation {
createMessage(groupId: String!, userId: String!, text: String!): Message
createUser(username: String!, email: String! password: String!, location:String!): User
}
schema {
query:Query
mutation: Mutation
}
`]
export default Schema;

用户的Mongoose架构和模型:
import mongoose from 'mongoose';
const Schema = mongoose.Schema;
const userSchema = new Schema({
name: {
type: String,
required: true
},
email: {
type: String,
required: true
},
password: {
type: String,
required: true
},
location: {
type: String,
required: true,
},
groups: [{
type: Schema.Types.ObjectId, ref: 'group'
}],
friends: [{
type: Schema.Types.ObjectId, ref: 'user'
}]
});
let userModel = mongoose.model('user', userSchema);
export default userModel;

这是解析器:
import GraphQLDate from 'graphql-date';
import groupModel from './models/groups';
import messageModel from './models/messages';
import userModel from './models/users';
export const Resolvers = {
Date: GraphQLDate,
Query: {
group(_, args) {
return groupModel.find({ $where: args }).exec((err, groups) => {
return groups;
})
},
messages(_, args) {
return messageModel.find()
},
user(_, args) {
return userModel.findOne()
},
},
Mutation: {
createMessage(_, { text, userId, groupId }) {
return messageModel.create({
from:userId,
message:text,
to:groupId,
});
},
createUser(_, { username, email, password, location}) {
return messageModel.create({
username:username,
email: email,
password: password,
location: location
});
},
},
Group: {
users(group) {
return group.getUsers();
},
messages(group) {
return messagemodel.findAll({
where: { groupId: group.id },
order: [['createdAt', 'DESC']],
});
},
},
Message: {
to(message) {
// return messageModel.find({id:message.id}).populate('to').exec((err,message) => {
// return message.to;
// })
return messageModel.findOne({ '_id': message.id }).populate('to').exec((err, message) => {
if (err) return err;
return message
})
},
from(message) {
return message.getUser();
},
},
User: {
groups(user) {
return user.getGroups();
},
friends(user) {
return user.getFriends();
},
},
};
export default Resolvers;

这是我对server.js的设置:
if (!process.env.NODE_ENV) process.env.NODE_ENV = "dev";
import express from 'express';
import { graphqlExpress, graphiqlExpress } from 'graphql-server-express';
import { makeExecutableSchema, addMockFunctionsToSchema } from 'graphql-tools';
import bodyParser from 'body-parser';
import { createServer } from 'http';
import Schema from './src/schema';
import Resolvers from './src/resolvers';
import mongoose from 'mongoose';
import config from './config';
var db = process.env.DB || config.DB[process.env.NODE_ENV];
var PORT = config.PORT[process.env.NODE_ENV];
const app = express();
mongoose.connect(db, function (err) {
if (!err) {
console.log(`connected to the Database: ${db}`);
} else {
console.log(`error connecting to the Database ${err}`);
}
});
const executableSchema = makeExecutableSchema({
typeDefs: Schema,
resolvers: Resolvers,
});
app.use('/graphql', bodyParser.json(), graphqlExpress({
schema: executableSchema,
context: {}, // at least(!) an empty object
}));
app.use('/graphiql', graphiqlExpress({
endpointURL: '/graphql',
}));
const graphQLServer = createServer(app);
graphQLServer.listen(PORT, () => console.log(`GraphQL Server is now running on http://localhost:${PORT}/graphql`));

所以我正在尝试学习Graphql来构建一个api,但是很多关于如何做事的不同教程很难找到它。任何人都可以告诉我或指出我正确的方向,我做错了吗?
答案 0 :(得分:1)
您说的用户名参数是'用户名'这不是有效类型(与电子邮件,密码和位置相同)。假设用户名,电子邮件,密码和位置是字符串并且是必需的,突变应该如下所示:
mutation createUser(username: String!, $email: String!, $password: String!, $location: String!) {
createUser(username: $username, email: $email, password: $password, location: $location {
username
email
password
location
}
}