如何在 angular 中为 graphql 使用 apollo 客户端处理错误?

How to handle error using apollo client in angular for graphql?

下面是我的代码。我一直在尝试以某种方式 link 错误变量到 GraphQL Module 。请提供实现该目标的方法。

import { ApolloModule, APOLLO_OPTIONS } from 'apollo-angular';
import { HttpLinkModule, HttpLink } from 'apollo-angular-link-http';
import { InMemoryCache } from 'apollo-cache-inmemory';
import { onError } from 'apollo-link-error';

const uri = 'http://localhost:3000/graphql'; 

const error = onError(({ graphQLErrors, networkError }) => { // need help on linking this with graphql module
  if (graphQLErrors)
    graphQLErrors.map(({ message, locations, path }) =>
      console.log(
        `[GraphQL error]: Message: ${message}, Location: ${locations}, Path: ${path}`,
      ),
    );

  if (networkError) console.log(`[Network error]: ${networkError}`);
});

// <-- add the URL of the GraphQL server here
export function createApollo(httpLink: HttpLink) {
  return {
    link: httpLink.create({ uri }),
    cache: new InMemoryCache(),
  };
}

@NgModule({
  exports: [ApolloModule, HttpLinkModule],
  providers: [
    {
      provide: APOLLO_OPTIONS,
      useFactory: createApollo,
      deps: [HttpLink],
    },
  ],
})
export class GraphQLModule {}

我需要有关 linking GraphQL 模块错误的帮助。我怎样才能做到这一点?提前致谢。

Apollo links 是可组合单元。每个 link 都是一个函数,它将操作作为参数,returns 是一个可观察值。 Apollo links 将像中间件一样工作,可以转换请求及其结果。

您可以将错误 [​​=15=] 合并到主模块中作为

export function createApollo(httpLink: HttpLink) {
  return {
    link: error.concat(httpLink.create({ uri })),
    cache: new InMemoryCache(),
  };
}