43 lines
1.3 KiB
Markdown
43 lines
1.3 KiB
Markdown
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Define a merged subscription with multiple subscription types.
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*[See also the Book](https://async-graphql.github.io/async-graphql/en/merging_objects.html).*
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# Macro attributes
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| Attribute | description | Type | Optional |
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|---------------|---------------------------|----------|----------|
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| name | Object name | string | Y |
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| extends | Add fields to an entity that's defined in another service | bool | Y |
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| visible | If `false`, it will not be displayed in introspection. *[See also the Book](https://async-graphql.github.io/async-graphql/en/visibility.html).* | bool | Y |
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| visible | Call the specified function. If the return value is `false`, it will not be displayed in introspection. | string | Y |
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# Examples
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```rust
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use async_graphql::*;
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use futures_util::stream::Stream;
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#[derive(Default)]
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struct Subscription1;
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#[Subscription]
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impl Subscription1 {
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async fn events1(&self) -> impl Stream<Item = i32> {
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futures_util::stream::iter(0..10)
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}
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}
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#[derive(Default)]
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struct Subscription2;
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#[Subscription]
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impl Subscription2 {
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async fn events2(&self) -> impl Stream<Item = i32> {
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futures_util::stream::iter(10..20)
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}
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}
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#[derive(MergedSubscription, Default)]
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struct Subscription(Subscription1, Subscription2);
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```
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