订阅不适用于Prisma 2和Nexus吗?

时间:2019-08-20 15:56:42

标签: javascript graphql prisma prisma-graphql nexus-prisma

Nexus的订阅没有记录,但是我搜索了Github并尝试了本书中的每个示例。只是对我不起作用。

我已经克隆了Prisma2 GraphQL boilerplate project,我的文件如下:

prisma / 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`))

相关的部分是Subscription,我不知道为什么它不起作用或应该如何起作用。

我在Github中搜索了this query,这导致所有项目都使用Subscriptions

我还发现this commit in this project与我的答案有关。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;
  },
});

与我的工作相似。但是它们确实有AnswerSubscriptionPayload,而且我没有任何包含Subscription的生成类型。

我该如何解决?我认为我所做的一切都正确,但是仍然无法正常工作。 GitHub上的每个示例都与上面相似,甚至我都在做同样的事情。

有什么建议吗?

编辑:尚未实现订阅:(

2 个答案:

答案 0 :(得分:1)

尽管未实施订阅,但我似乎可以正常工作。我有一个有效的pubsub概念证明,它基于prisma2样板和Ben Awad的视频教程https://youtu.be/146AypcFvAU。应该可以使用redis和websockets来启动它并运行它,以处理订阅,直到达到Arizonaa2版本为止。

https://github.com/ryanking1809/prisma2_subscriptions

答案 1 :(得分:0)

订阅尚未实现。

我已经打开an issue进行跟踪。

我将在《棱镜2》中实施后立即编辑此答案。