阿波罗/ GraphQl -单一实体突变不更新缓存(数据库更新)

const { gql } = require('apollo-server');
const { ApolloServer } = require('apollo-server');
const { InMemoryCache } = require('apollo-cache-inmemory');
const { ApolloLink } = require('apollo-link');
const { HttpLink } = require('apollo-link-http');

// 定义突变操作的GraphQL类型和查询语句
const typeDefs = gql`
  type Mutation {
    updatePost(id: ID!, title: String!): Post
  }

  type Post {
    id: ID!
    title: String!
  }
`;

// 实现突变操作的逻辑
const resolvers = {
  Mutation: {
    updatePost: (_, { id, title }, { cache }) => {
      const data = {
        Post: {
          __typename: 'Post',
          id,
          title
        }
      };

      // 更新缓存数据
      cache.writeData({ data });

      // 返回更新后的数据
      return data.Post;
    }
  }
};

// 创建Apollo Server实例
const server = new ApolloServer({
  typeDefs,
  resolvers,
  cache: new InMemoryCache(),
  link: ApolloLink.from([
    new HttpLink({ uri: 'http://example.com/graphql' })
  ])
});

// 启动Apollo Server
server.listen().then(({ url }) => {
  console.log(`Server ready at ${url}`);
});