Guillaume Chau
89 lines
2.1 KiB
Markdown
89 lines
2.1 KiB
Markdown
# ApolloSubscribeToMore
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You can subscribe to more data with the `ApolloSubscribeToMore` (or `apollo-subscribe-to-more`) component. You can put as many of those as you want inside a `<ApolloQuery>` component.
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::: tip
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If the update is related to an existing object (for example, changing the value of a field), `updateQuery` is not required as Apollo client will be able to update the cache automatically.
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:::
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Here is an example:
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```vue
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<template>
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<ApolloQuery :query="...">
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<ApolloSubscribeToMore
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:document="require('../gql/MessageAdded.gql')"
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:variables="{ channel }"
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:updateQuery="onMessageAdded"
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/>
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<!-- ... -->
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</ApolloQuery>
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</template>
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<script>
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export default {
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data () {
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return {
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channel: 'general',
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}
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},
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methods: {
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onMessageAdded (previousResult, { subscriptionData }) {
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// The previous result is immutable
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const newResult = {
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messages: [...previousResult.messages],
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}
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// Add the question to the list
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newResult.messages.push(subscriptionData.data.messageAdded)
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return newResult
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},
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},
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}
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</script>
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```
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See [API Reference](../../api/apollo-subscribe-to-more.md).
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## Examples of `updateQuery`
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Add a new item to the cache:
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```js
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methods: {
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onMessageAdded (previousResult, { subscriptionData }) {
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// The previous result is immutable
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const newResult = {
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messages: [...previousResult.messages],
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}
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// Add the question to the list
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newResult.messages.push(subscriptionData.data.messageAdded)
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return newResult
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}
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}
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```
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Remove an item to the cache:
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```js
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methods: {
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onMessageAdded (previousResult, { subscriptionData }) {
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const removedMessage = subscriptionData.data.messageRemoved
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const index = previousResult.messages.findIndex(
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m => m.id === removedMessage.id
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)
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if (index === -1) return previousResult
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// The previous result is immutable
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const newResult = {
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messages: [...previousResult.messages],
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}
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// Remove the question from the list
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newResult.messages.splice(index, 1)
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return newResult
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}
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}
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```
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