60 lines
1.2 KiB
Markdown
60 lines
1.2 KiB
Markdown
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# Default value
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You can define default values for input value types.
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The following shows how to define default values for different types.
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## Object field
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```rust
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use async_graphql::*;
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struct Query;
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fn my_default() -> i32 {
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30
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}
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#[Object]
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impl Query {
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// The default value of the value parameter is 0, it will call i32::default()
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fn test1(&self, #[arg(default)] value: i32) {}
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// The default value of the value parameter is 10
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fn test2(&self, #[arg(default = 10)] value: i32) {}
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// The default value of the value parameter uses the return result of the my_default function, the value is 30.
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fn test3(&self, #[arg(default_with = "my_default()")] value: i32) {}
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}
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```
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## Interface field
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```rust
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use async_graphql::*;
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#[Interface(
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field(name = "test1", arg(name = "value", default)),
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field(name = "test2", arg(name = "value", default = 10)),
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field(name = "test3", arg(name = "value", default = "my_default()")),
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)]
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enum MyInterface {
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MyObj(MyObj),
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}
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```
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## Input object field
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```rust
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use async_graphql::*;
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struct MyInputObject {
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#[field(default)]
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value1: i32,
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#[field(default = 10)]
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value2: i32,
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#[field(default = "my_default()")]
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value3: i32,
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}
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```
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