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Add default for structs to attr-default page #84

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Add default for structs to attr-default page #84

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21 changes: 20 additions & 1 deletion _src/attr-default.md
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
# Default value for a field

!PLAYGROUND 26df8969cb9df94a7d4a0443dcfb712f
!PLAYGROUND 7683f076daaf4a4f7d043bcb645c5442
```rust
#[macro_use]
extern crate serde_derive;
Expand All @@ -9,7 +9,12 @@ extern crate serde;
extern crate serde_json;

#[derive(Deserialize, Debug)]
#[serde(default)]
struct Request {
// Use the encapsulating structs default value if "method" is not
// included in the input
method: Method,

// Use the result of a function as the default if "resource" is
// not included in the input.
#[serde(default = "default_resource")]
Expand All @@ -26,6 +31,20 @@ struct Request {
priority: Priority,
}

impl Default for Request {
fn default() -> Self {
Request {
timeout: Timeout(0),
priority: Priority::Normal,
resource: "/resource".to_string(),
method: Method::Get
}
}
}

#[derive(Deserialize, Debug)]
enum Method { Post, Get, Update, Delete }

fn default_resource() -> String {
"/".to_string()
}
Expand Down