3b7ed74d11
- examples to fix still
- error_extensions.md ResultExt example does not compile!
- trait ErrorExtensions is not implemented for ParseIntError
- dataloader
- requires sqlx to work. So we either "stub" it OR we rewrite them simpler to use a simple "faux" db library
41 lines
1.1 KiB
Markdown
41 lines
1.1 KiB
Markdown
# OneofObject
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A `OneofObject` is a special type of `InputObject`, in which only one of its fields must be set and is not-null.
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It is especially useful when you want a user to be able to choose between several potential input types.
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This feature is still an [RFC](https://github.com/graphql/graphql-spec/pull/825) and therefore not yet officially part of the GraphQL spec, but `Async-graphql` already supports it!
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```rust
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# extern crate async_graphql;
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# #[derive(SimpleObject)]
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# struct User { a: i32 }
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use async_graphql::*;
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#[derive(OneofObject)]
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enum UserBy {
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Email(String),
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RegistrationNumber(i64),
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Address(Address)
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}
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#[derive(InputObject)]
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struct Address {
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street: String,
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house_number: String,
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city: String,
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zip: String,
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}
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struct Query {}
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#[Object]
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impl Query {
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async fn search_users(&self, by: Vec<UserBy>) -> Vec<User> {
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// ... Searches and returns a list of users ...
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# todo!()
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}
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}
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```
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As you can see, a `OneofObject` is represented by an `enum` in which each variant contains another `InputType`. This means that you can use [`InputObject`](define_input_object.md) as variant too.
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