[英]How to make a mutation query for inserting a list of (Array) fields in GraphQL
最近我开始研究GraphQL,我能够在没有任何问题的情况下在平面模式中插入数据但是当涉及数据数组时,我收到的错误就像
{ "errors": [ { "message": "Must be input type" } ]}
我正在使用邮递员测试我的查询,我的变异查询是
mutation M {
AddEvent
(
title: "Birthday event"
description:"Welcome to all"
media:[{url:"www.google.com", mediaType:"image" }]
location:[{address:{state:"***", city:"****"}}]
)
{title,description,media,location,created,_id}}
这是我的事件架构:
EventType = new GraphQLObjectType({
name: 'Event',
description: 'A Event',
fields: () => ({
_id: {
type: GraphQLString,
description: 'The id of the event.',
},
id: {
type: GraphQLString,
description: 'The id of the event.',
},
title: {
type: GraphQLString,
description: 'The title of the event.',
},
description: {
type: GraphQLString,
description: 'The description of the event.',
},
media:{
type:new GraphQLList(mediaType),
description:'List of media',
},
location:{
type:new GraphQLList(locationType),
description:'List of location',
}
})
});
// Media Type
export var mediaType = new GraphQLObjectType({
name: 'Media',
description: 'A Media',
fields: () => ({
_id: {
type: GraphQLString,
description: 'The id of the event.',
},
url:{
type: GraphQLString,
description: 'The url of the event.',
},
mediaType:{
type: GraphQLString,
description: 'The mediaTypa of the event.',
}
})
});
// Location Type
export var locationType = new GraphQLObjectType({
name: 'Location',
description: 'A location',
fields: () => ({
_id: {
type: GraphQLString,
description: 'The id of the event.',
},
address:{
type: GraphQLString,
description: 'The address.',
},
state:{
type: GraphQLString,
description: 'The state.',
},
city:{
type: GraphQLString,
description: 'The city.',
},
zip:{
type: GraphQLString,
description: 'The zip code.',
},
country:{
type: GraphQLString,
description: 'The country.',
}
})
});
猫鼬模式:
var EventSchema = new mongoose.Schema({
title: {
required: true,
type: String,
trim: true,
match: /^([\w ,.!?]{1,100})$/
},
description: {
required: false,
type: String,
trim: true,
match: /^([\w ,.!?]{1,100})$/
},
media: [{
url: {
type: String,
trim: true
},
mediaType: {
type: String,
trim: true
}
}],
location: [{
address: {
type: String
},
city: {
type: String
},
state: {
type: String
},
zip: {
type: String
},
country: {
type: String
}
}]
})
突变类型:
addEvent: {
type: EventType,
args: {
_id: {
type: GraphQLString,
description: 'The id of the event.',
},
title: {
type: GraphQLString,
description: 'The title of the event.',
},
description: {
type: GraphQLString,
description: 'The description of the event.',
},
media:{
type:new GraphQLList(mediaType),
description:'List of media',
},
location:{
type:new GraphQLList(locationType),
description:'List of media',
},
created: {
type: GraphQLInt,
description: 'The created of the user.',
}
},
resolve: (obj, {title,description,media,location,created,_id}) => {
let toCreateEvent = {
title,
description,
created:new Date(),
start: new Date(),
media,
location,
_id,
};
return mongo()
.then(db => {
return new Promise(
function(resolve,reject){
let collection = db.collection('events');
collection.insert(toCreateEvent, (err, result) => {
db.close();
if (err) {
reject(err);
return;
}
resolve(result);
});
})
});
}
}
您的问题是,当您定义突变时,所有类型都必须是输入类型,因此您得到的错误是"Must be input type"
。 所以在这里(来自你的变异):
media:{
type:new GraphQLList(mediaType),
description:'List of media',
},
location:{
type:new GraphQLList(locationType),
description:'List of media',
},
GraphQLList
, mediaType
和locationType
必须是输入类型。
GraphQLList
已经是一种输入类型(请参阅https://github.com/graphql/graphql-js/blob/master/src/type/definition.js#L74-L82以查看被视为输入类型的GraphQL类型列表) 。
但是,您的类型mediaType
和locationType
是GraphQLObjectType
类型,它不是输入类型,但是如果再次查看输入类型列表: https : //github.com/graphql/graphql-js/blob/master/src/type /definition.js#L74-L82 ,你会发现GraphQLInputObjectType
是一个对象输入类型,因此,你需要做的是用它们的“输入”版本替换mediaType
和locationType
。
我建议做的是创建mediaInputType
和locationInputType
,它们具有与mediaType
和locationType
相同的字段结构,但是使用new GraphQLInputObjectType({...
而不是new GraphQLObjectType({...
并在您的变异中使用它们)创建。
我遇到了同样的问题,我就这样解决了,如果你有任何问题,请随时发表评论。
我遇到了同样的问题 - 我不知道如何在输入定义中指定对象数组。 因此对于那些想要查看“文本”架构解决方案的人:
type Book {
title: String!
}
在输入类型中包含一系列Books
input AuthorInput {
name: String!
age: Int!
}
你不能只是在输入语句中添加books: [Book!]
,你需要刻意创建包含所需字段的输入类型(如果你愿意,可以重复):
input BookInput {
title: String!
}
然后你可以:
input AuthorInput {
name: String!
age: Int!
books: [BookInput!]
}
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