在graphql中嵌套数据的正确方法是什么? [英] What is the correct way to nest data within a graphql?
问题描述
我在数据库中有一个地址,已将该地址放入 location
哈希中.哈希包含用于 streetAddress
, city
, state
和 zipCode
的单独键.我已经将数据嵌套在我的graphql模式文件中:
I have an address in my database that I've put into a location
hash. The hash contains separate keys for streetAddress
, city
, state
, and zipCode
. I've nested the data like so in my graphql schema file:
location: {
streetAddress: {
type: String,
required: true,
unqiue: true
},
city: {
type: String,
required: true
},
state: {
type: String,
required: true
},
zipCode: {
type: Number,
required: true
}
}
我已经实现了这样的模式类型:
And I've implemented the schema type like this:
fields: () => ({
id: { type: GraphQLID },
name: { type: GraphQLString },
id: {type: GraphQLID},
phoneNum: { type: GraphQLString },
location: {
streetAddress: { type: GraphQLString },
city: { type: GraphQLString },
state: { type: GraphQLString },
zipCode: { type: GraphQLInt }
}
...
但是,当我尝试在graphql中进行查询时,收到一条错误消息,指出输出类型未定义:
However, I get an error message saying that the output type is undefined when I try to do a query in graphql:
"message": "The type of RestaurantType.location must be Output Type but got: undefined."
我相信我了解错误的出处;我假设它希望 location
也具有类型.这样做/修复此错误消息的正确语法是什么?
I believe I understand where the error is coming from; I'm assuming that it expects location
to have a type as well. What would be the correct syntax for doing this/fixing this error message?
推荐答案
您猜到了,您不能有这样的嵌套字段.您需要为架构中的每个对象创建一个单独的类型.首先创建类型:
As you guessed, you cannot have nested fields like that. You need to create a separate type for every object in your schema. First create the type:
const Location = new GraphQLObjectType({
name: 'Location',
fields: () => ({
streetAddress: { type: GraphQLString },
city: { type: GraphQLString },
state: { type: GraphQLString },
zipCode: { type: GraphQLInt }
}),
})
然后使用它:
const Restaurant = new GraphQLObjectType({
name: 'Restaurant',
fields: () => ({
id: { type: GraphQLID },
name: { type: GraphQLString },
location: { type: Location },
}),
})
或者如果您不需要重用该类型,则可以像这样内联定义它:
or if you don't need to reuse the type, you can define it inline like this:
const Restaurant = new GraphQLObjectType({
name: 'Restaurant',
fields: () => ({
id: { type: GraphQLID },
name: { type: GraphQLString },
location: {
type: new GraphQLObjectType({
name: 'Location',
fields: () => ({
streetAddress: { type: GraphQLString },
city: { type: GraphQLString },
state: { type: GraphQLString },
zipCode: { type: GraphQLInt }
}),
})
},
}),
})
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