Question

下面是我的阿波罗角设置代码：

providers: [
    {
      provide: APOLLO_OPTIONS,
      useFactory: (httpLink: HttpLink) => {
        return {
          cache: new InMemoryCache(),
          link: httpLink.create({
            uri: AppSettings.API_ENDPOINT

          })
        }
      },
      deps: [HttpLink]
    }
  ],

我想在下面使用：

const link = onError(({ graphQLErrors, networkError }) => {
  if (graphQLErrors)
    graphQLErrors.map(({ message, locations, path }) =>
      console.log(
        `[GraphQL error]: Message: ${message}, Location: ${locations}, Path: ${path}`,
      ),
    );

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

如何链接此链接，以便在控制台中出现错误？

Answer 1

我昨天刚开始处理这个问题，所以没有很好的专家，但是我认为它确实可以满足您的要求。我在网上也找不到很好的例子。

这将触发一个对话框，在对话框中显示您想要的任何消息。我没有包含对话框代码，但是它存在于我的messagesService中。

请注意，我把InMemoryCache留在了那里，以作为诸如此类不需要的响应的注释。它包含在Boost中并自动设置。我可以使用readQuery读取它。

我使用Boost并将其放在导出类中的app.module中，因为无法在模块提供程序中使其正常工作。最初，我的设置方式与您一样，但是无法到达messagesService。它也可以是一项服务，我可以将其移到那里。这是全局的，您无需在组件中做任何事情。很好！

app.module.ts

export class AppModule {

// Create and setup the Apollo server with error catching globally.
  constructor(
      private messagesService: MessagesService,
      private apollo: ApolloBoost,
  ) {
    apollo.create({
      uri: 'http://localhost:3000/graphql',
      // cache: new InMemoryCache(),  // This is included by default.  Can be modified.
      onError: ({ graphQLErrors, networkError }) => {
        if (graphQLErrors) {
          graphQLErrors.map(({ message, locations, path }) =>
              console.log(
                  `[GraphQL error]: Message: ${message}, Location: ${locations}, Path: ${path}`),
              console.log('This is a graphQL error!'),
          );
          const msg1 = 'GraphQL error';
          const msg2 = 'Please contact support.';
          this.handleError(msg1, msg2)
        }
        if (networkError) {
          console.log('This is a Network Error!', networkError);
          console.log('Can be called from a query error in the browser code!');
          const msg1 = 'Network error';
          const msg2 = 'Please check your Internet connection.  If OK then contact support .';
          this.handleError(msg1, msg2)
        }
      }
    });
  }


  public handleError(msg1, msg2) {
    this.messagesService.openDialog(msg1, msg2);
  }

}

Answer 2

这是我使用'apollo-link-error'处理graphQL错误和网络错误的方法。我创建了一个名为 apollo-clients-module.ts 的单独模块，并将其导入到app.module.ts和我拥有的其他功能模块中。

apollo-clients-module.ts代码：

import { NgModule } from "@angular/core";
import { HttpLink } from "apollo-angular-link-http";
import { InMemoryCache } from "apollo-cache-inmemory";
import { Apollo, ApolloModule } from "apollo-angular";
import { ApolloLink } from 'apollo-link';
import { onError } from "apollo-link-error";

@NgModule({
  declarations: [],
  imports: [ApolloModule]
})
export class ApolloClientsModule {

  constructor(private apollo: Apollo, private httpLink: HttpLink) {

    const link = onError(({ graphQLErrors, networkError }) => {
      if(graphQLErrors){
        graphQLErrors.map(({ message, locations, path }) => {
          // Here you may display a message to indicate graphql error
          // You may use 'sweetalert', 'ngx-toastr' or any of your preference
          console.log(`[GraphQL error]: Message: ${message}, Location: ${locations}, Path: ${path}`);
        })
      }
      if(networkError){
          // Here you may display a message to indicate network error
          console.log(`[Network error]: ${networkError}`);
      }
    });

    apollo.create(
      {
        link : ApolloLink.from([link, httpLink.create({ uri: "/end-point-uri-goes-here/graphql" })]) ,
        cache: new InMemoryCache(),
        defaultOptions : {
          watchQuery : {
            fetchPolicy : 'network-only',
            errorPolicy : 'all'
          }
        }
      },
      "default"
    );  
  }

}

记住'npm install apollo-link-error'

访问https://www.apollographql.com/docs/angular/features/error-handling/了解更多信息。

如何从angular的'apollo-link-error'中使用import {onError}处理所有错误

2 个答案: