Nexus 订阅没有记录，但我搜索了 Github 并尝试了书中的每个示例。它只是不适合我。
我已经克隆了 Prisma2 GraphQL 样板项目，我的文件如下：
棱镜/schema.prisma
datasource db {
provider = "sqlite"
url = "file:dev.db"
default = true
}
generator photon {
provider = "photonjs"
}
generator nexus_prisma {
provider = "nexus-prisma"
}
model Pokemon {
id String @default(cuid()) @id @unique
number Int @unique
name String
attacks PokemonAttack?
}
model PokemonAttack {
id Int @id
special Attack[]
}
model Attack {
id Int @id
name String
damage String
}
src/index.js
const { GraphQLServer } = require('graphql-yoga')
const { join } = require('path')
const { makeSchema, objectType, idArg, stringArg, subscriptionField } = require('@prisma/nexus')
const Photon = require('@generated/photon')
const { nexusPrismaPlugin } = require('@generated/nexus-prisma')
const photon = new Photon()
const nexusPrisma = nexusPrismaPlugin({
photon: ctx => ctx.photon,
})
const Attack = objectType({
name: "Attack",
definition(t) {
t.model.id()
t.model.name()
t.model.damage()
}
})
const PokemonAttack = objectType({
name: "PokemonAttack",
definition(t) {
t.model.id()
t.model.special()
}
})
const Pokemon = objectType({
name: "Pokemon",
definition(t) {
t.model.id()
t.model.number()
t.model.name()
t.model.attacks()
}
})
const Query = objectType({
name: 'Query',
definition(t) {
t.crud.findManyPokemon({
alias: 'pokemons'
})
t.list.field('pokemon', {
type: 'Pokemon',
args: {
name: stringArg(),
},
resolve: (parent, { name }, ctx) => {
return ctx.photon.pokemon.findMany({
where: {
name
}
})
},
})
},
})
const Mutation = objectType({
name: 'Mutation',
definition(t) {
t.crud.createOnePokemon({ alias: 'addPokemon' })
},
})
const Subscription = subscriptionField('newPokemon', {
type: 'Pokemon',
subscribe: (parent, args, ctx) => {
return ctx.photon.$subscribe.pokemon()
},
resolve: payload => payload
})
const schema = makeSchema({
types: [Query, Mutation, Subscription, Pokemon, Attack, PokemonAttack, nexusPrisma],
outputs: {
schema: join(__dirname, '/schema.graphql')
},
typegenAutoConfig: {
sources: [
{
source: '@generated/photon',
alias: 'photon',
},
],
},
})
const server = new GraphQLServer({
schema,
context: request => {
return {
...request,
photon,
}
},
})
server.start(() => console.log(` Server ready at http://localhost:4000`))
相关部分是Subscription我不知道它为什么不工作或它应该如何工作的部分。
我在 Github 上搜索了这个查询，结果所有项目都使用Subscriptions.
我还发现这个项目中的这个提交与我的答案相关。为简洁起见，在此处发布相关代码：
import { subscriptionField } from 'nexus';
import { idArg } from 'nexus/dist/core';
import { Context } from './types';
export const PollResultSubscription = subscriptionField('pollResult', {
type: 'AnswerSubscriptionPayload',
args: {
pollId: idArg(),
},
subscribe(_: any, { pollId }: { pollId: string }, context: Context) {
// Subscribe to changes on answers in the given poll
return context.prisma.$subscribe.answer({
node: { poll: { id: pollId } },
});
},
resolve(payload: any) {
return payload;
},
});
这与我所做的类似。但他们确实有AnswerSubscriptionPayload& 我没有得到任何包含Subscription在其中的生成类型。
我该如何解决这个问题？我认为我做的一切都是正确的，但它仍然无法正常工作。GitHub 上的每个示例都与上面类似，甚至我也在做同样的事情。
有什么建议么？
编辑：订阅尚未实现:(