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vue-apollo's Introduction

Apollo in Vue

Integrates apollo in your vue components with declarative queries.

Apollo "hello world" app

Installation

npm install --save vue-apollo apollo-client

Usage

Configuration

import Vue from 'vue';
import ApolloClient, { createNetworkInterface, addTypename } from './apollo-client';
import VueApollo from 'vue-apollo';

// Create the apollo client
const apolloClient = new ApolloClient({
  networkInterface: createNetworkInterface({
    uri: 'http://localhost:8080/graphql',
    transportBatching: true,
  }),
  queryTransformer: addTypename,
});

// Install the vue plugin
Vue.use(VueApollo, {
  apolloClient,
});

Usage in components

To declare apollo queries in your Vue component, add an apollo object :

new Vue({
    apollo: {
        // Apollo specific options
    },
});

You can access the apollo-client instance with this.$apollo.client in all your vue components.

Queries

In the apollo object, add an attribute for each property you want to feed with the result of an Apollo query.

Simple query

Use gql to write your GraphQL queries:

import gql from 'graphql-tag';

Put the gql query directly as the value:

apollo: {
  // Simple query that will update the 'hello' vue property
  hello: gql`{hello}`,
},

Don't forget to initialize your property in your vue component:

data () {
  return {
    // Initialize your apollo data
    hello: '',
  },
},

Or with the ES2015 syntax:

data: () => ({
  // Initialize your apollo data
  hello: '',
}),

Server-side, add the corresponding schema and resolver:

export const schema = `
type Query {
  hello: String
}

schema {
  query: Query
}
`;

export const resolvers = {
  Query: {
    hello(root, args, context) {
      return "Hello world!";
    },
  },
};

For more info, visit the apollo doc.

You can then use your property as usual in your vue component:

<template>
  <div class="apollo">
    <h3>Hello</h3>
    <p>
      {{hello}}
    </p>
  </div>
</template>

Query with parameters

You can add variables (read parameters) to your gql query by declaring query and variables in an object:

// Apollo-specific options
apollo: {
  // Query with parameters
  ping: {
    // gql query
    query: gql`query PingMessage($message: String!) {
      ping(message: $message)
    }`,
    // Static parameters
    variables: {
      message: 'Meow',
    },
  },
},

You can use the apollo watchQuery options in the object, like:

  • forceFetch
  • fragments
  • returnPartialData
  • pollInterval
  • ...

See the apollo doc for more details.

For example, you could add the forceFetch apollo option like this:

apollo: {
  // Query with parameters
  ping: {
    query: gql`query PingMessage($message: String!) {
      ping(message: $message)
    }`,
    variables: {
      message: 'Meow'
    },
    // Additional options here
    forceFetch: true,
  },
},

Don't forget to initialize your property in your vue component:

data () {
  return {
    // Initialize your apollo data
    ping: '',
  };
},

Or with the ES2015 syntax:

data: () => ({
  // Initialize your apollo data
  ping: '',
}),

Server-side, add the corresponding schema and resolver:

export const schema = `
type Query {
  ping(message: String!): String
}

schema {
  query: Query
}
`;

export const resolvers = {
  Query: {
    ping(root, { message }, context) {
      return `Answering ${message}`;
    },
  },
};

And then use it in your vue component:

<template>
  <div class="apollo">
    <h3>Ping</h3>
    <p>
      {{ping}}
    </p>
  </div>
</template>

Reactive parameters

Use a function instead to make the parameters reactive with vue properties:

// Apollo-specific options
apollo: {
  // Query with parameters
  ping: {
    query: gql`query PingMessage($message: String!) {
      ping(message: $message)
    }`,
    // Reactive parameters
    variables() {
      // Use vue reactive properties here
      return {
          message: this.pingInput,
      };
    },
  },
},

This will re-fetch the query each time a parameter changes, for example:

<template>
  <div class="apollo">
    <h3>Ping</h3>
    <input v-model="pingInput" placeholder="Enter a message" />
    <p>
      {{ping}}
    </p>
  </div>
</template>

Advanced options

These are the available advanced options you can use:

  • update(data) {return ...} to customize the value that is set in the vue property, for example if the field names don't match.
  • result(data) is a hook called when a result is received.
  • error(error) is a hook called when there are errors, error being an Apollo error object with either a graphQLErrors property or a networkError property.
  • loadingKey will update the component data property you pass as the value. You should initialize this property to 0 in the component data() hook. When the query is loading, this property will be incremented by 1 and as soon as it no longer is, the property will be decremented by 1. That way, the property can represent a counter of currently loading queries.
  • watchLoading(isLoading, countModifier) is a hook called when the loading state of the query changes. The countModifier parameter is either equal to 1 when the query is now loading, or -1 when the query is no longer loading.
// Apollo-specific options
apollo: {
  // Advanced query with parameters
  // The 'variables' method is watched by vue
  pingMessage: {
    query: gql`query PingMessage($message: String!) {
      ping(message: $message)
    }`,
    // Reactive parameters
    variables() {
      // Use vue reactive properties here
      return {
          message: this.pingInput,
      };
    },
    // We use a custom update callback because
    // the field names don't match
    // By default, the 'pingMessage' attribute
    // would be used on the 'data' result object
    // Here we know the result is in the 'ping' attribute
    // considering the way the apollo server works
    update(data) {
      console.log(data);
      // The returned value will update
      // the vue property 'pingMessage'
      return data.ping;
    },
    // Optional result hook
    result(data) {
      console.log("We got some result!");
    },
    // Error handling
    error(error) {
      console.error('We\'ve got an error!', error);
    },
    // Loading state
    // loadingKey is the name of the data property
    // that will be incremented when the query is loading
    // and decremented when it no longer is.
    loadingKey: 'loadingQueriesCount',
    // watchLoading will be called whenever the loading state changes
    watchLoading(isLoading, countModifier) {
      // isLoading is a boolean
      // countModifier is either 1 or -1
    },
  },
},

If you use ES2015, you can also write the update like this:

update: data => data.ping

Reactive Query Example

Here is a reactive query example using polling:

// Apollo-specific options
apollo: {
  // 'tags' data property on vue instance
  tags: {
    query: gql`query tagList {
      tags {
        id,
        label
      }
    }`,
    pollInterval: 300, // ms
  },
},

Here is how the server-side looks like:

export const schema = `
type Tag {
  id: Int
  label: String
}

type Query {
  tags: [Tag]
}

schema {
  query: Query
}
`;

// Fake word generator
import casual from 'casual';

// Let's generate some tags
var id = 0;
var tags = [];
for (let i = 0; i < 42; i++) {
  addTag(casual.word);
}

function addTag(label) {
  let t = {
    id: id++,
    label,
  };
  tags.push(t);
  return t;
}

export const resolvers = {
  Query: {
    tags(root, args, context) {
      return tags;
    },
  },
};

Mutations

Mutations are queries that changes your data state on your apollo server. For more info, visit the apollo doc.

methods: {
  addTag() {
    // We save the user input in case of an error
    const newTag = this.newTag;
    // We clear it early to give the UI a snappy feel
    this.newTag = '';
    // Call to the graphql mutation
    this.$apollo.mutate({
      // Query
      mutation: gql`mutation ($label: String!) {
        addTag(label: $label) {
          id
          label
        }
      }`,
      // Parameters
      variables: {
        label: newTag,
      },
      // Update the cache with the result
      // 'tagList' is the name of the query declared before
      // that will be updated with the optimistic response
      // and the result of the mutation
      updateQueries: {
        tagList: (previousQueryResult, { mutationResult }) => {
          // We incorporate any received result (either optimistic or real)
          // into the 'tagList' query we set up earlier
          return {
            tags: [...previousQueryResult.tags, mutationResult.data.addTag],
          };
        },
      },
      // Optimistic UI
      // Will be treated as a 'fake' result as soon as the request is made
      // so that the UI can react quickly and the user be happy
      optimisticResponse: {
        __typename: 'Mutation',
        addTag: {
          __typename: 'Tag',
          id: -1,
          label: newTag,
        },
      },
    }).then((data) => {
      // Result
      console.log(data);
    }).catch((error) => {
      // Error
      console.error(error);
      // We restore the initial user input
      this.newTag = newTag;
    });
  },
},

Server-side:

export const schema = `
type Tag {
  id: Int
  label: String
}

type Query {
  tags: [Tag]
}

type Mutation {
  addTag(label: String!): Tag
}

schema {
  query: Query
  mutation: Mutation
}
`;

// Fake word generator
import faker from 'faker';

// Let's generate some tags
var id = 0;
var tags = [];
for (let i = 0; i < 42; i++) {
  addTag(faker.random.word());
}

function addTag(label) {
  let t = {
    id: id++,
    label,
  };
  tags.push(t);
  return t;
}

export const resolvers = {
  Query: {
    tags(root, args, context) {
      return tags;
    },
  },
  Mutation: {
    addTag(root, { label }, context) {
      console.log(`adding tag '${label}'`);
      return addTag(label);
    },
  },
};

LICENCE ISC - Created by Guillaume CHAU (@Akryum)

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