apollo-angular-boost

Apollo Angular Boost

Purpose

Easiest way to get started with Apollo Client!

Apollo Angular Boost is a zero-config way to start using Apollo. It includes some sensible defaults, such as our recommended InMemoryCache and HttpLink, which come configured for you with our recommended settings.

Installation

npm install apollo-angular-boost --save

or

yarn add apollo-angular-boost

What's in Apollo Boost

Apollo Boost includes some packages that we think are essential to developing with Apollo Client. Here's what's in the box:

• apollo-client: Where all the magic happens
• apollo-angular: Integrates Apollo Client with Angular
• apollo-cache-inmemory: Our recommended cache
• apollo-angular-link-http: An Apollo Link for remote data fetching (based on Angular's HttpClient)
• apollo-link-error: An Apollo Link for error handling
• apollo-link-state: An Apollo Link for local state management
• graphql-tag: Exports the gql function for your queries & mutations

The awesome thing about Apollo Boost is that you don't have to set any of this up yourself! Just specify a few options if you'd like to use these features and we'll take care of the rest.

Usage

How to set it up?

import {HttpClientModule} from '@angular/common/http';
import {ApolloBoostModule, ApolloBoost} from 'apollo-angular-boost';

@NgModule({
  imports: [HttpClientModule, ApolloBoostModule],
})
export class AppModule {
  constructor(apolloBoost: ApolloBoost) {
    apolloBoost.create({
      uri,
    });
  }
}

How to use it in a component or a service?

import {Apollo, gql} from 'apollo-angular-boost';

export class AppComponent {
  constructor(apollo: Apollo) {
    const allPosts = apollo.watchQuery({
      query: gql`
        query allPosts {
          posts {
            id
            title
            text
          }
        }
      `,
    });

    // ...
  }
}

To read more about the API and its usage, please visit Apollo Angular documentation.

Because Apollo service of apollo-angular-boost is the same service that apollo-angular exports the documentation works for both.

Apollo Boost options

Here are the options you can pass to the ApolloBoost exported from apollo-angular-boost. None of them are required.

• uri: A string representing your GraphQL server endpoint. Defaults to /graphql
• fetchOptions: An object representing any options you would like to pass to fetch (credentials, headers, etc). These options are static, so they don't change on each request.
• request?: (operation: Operation) => Promise;
  • This function is called on each request. It takes an operation and can return a promise. To dynamically set fetchOptions, you can add them to the context of the operation with operation.setContext({ headers }). Any options set here will take precedence over fetchOptions.
  • Use this function for authentication
• onError: (errorObj: { graphQLErrors: GraphQLError[], networkError: Error, response?: ExecutionResult, operation: Operation }) => void
  • We include a default error handler to log out your errors for you. If you would like to handle your errors differently, specify this function
• clientState: An object representing your configuration for apollo-link-state. This is useful if you would like to use the Apollo cache for local state management. Learn more in our quick start.
• cacheRedirects: An map of functions to redirect a query to another entry in the cache before a request takes place. This is useful if you have a list of items and want to use the data from the list query on a detail page where you're querying an individual item. More on that here.

That's it! Here's an example of all those options in action:

import { ApolloBoost } from 'apollo-boost';

@NgModule({...})
export class GraphQLModule {
  constructor(apollo: ApolloBoost) {
    apollo.create({
      uri: 'https://nx9zvp49q7.lp.gql.zone/graphql',
      fetchOptions: {
        credentials: 'include'
      },
      request: async (operation) => {
        const token = await AsyncStorage.getItem('token');
        operation.setContext({
          headers: {
            authorization: token
          }
        });
      },
      onError: ({ graphQLErrors, networkError }) => {
        if (graphQLErrors) {
          sendToLoggingService(graphQLErrors);
        }
        if (networkError) {
          logoutUser();
        }
      },
      clientState: {
        defaults: {
          isConnected: true
        },
        resolvers: {
          Mutation: {
            updateNetworkStatus: (_, { isConnected }, { cache }) => {
              cache.writeData({ data: { isConnected }});
              return null;
            }
          }
        }
      },
      cacheRedirects: {
        Query: {
          movie: (_, { id }, { getCacheKey }) =>
            getCacheKey({ __typename: 'Movie', id });
        }
      }
    })
  }
}