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Extractor configuration Migration (#937)

added guide for Extractor configuration in MIGRATION.md
This commit is contained in:
Dustin Bensing 2019-06-24 03:16:04 +02:00 committed by Nikolay Kim
parent 1a24ff8717
commit b948f74b54

View file

@ -31,6 +31,64 @@
## 1.0.0
* Extractor configuration. In version 1.0 this is handled with the new `Data` mechanism for both setting and retrieving the configuration
instead of
```rust
#[derive(Default)]
struct ExtractorConfig {
config: String,
}
impl FromRequest for YourExtractor {
type Config = ExtractorConfig;
type Result = Result<YourExtractor, Error>;
fn from_request(req: &HttpRequest, cfg: &Self::Config) -> Self::Result {
println!("use the config: {:?}", cfg.config);
...
}
}
App::new().resource("/route_with_config", |r| {
r.post().with_config(handler_fn, |cfg| {
cfg.0.config = "test".to_string();
})
})
```
use the HttpRequest to get the configuration like any other `Data` with `req.app_data::<C>()` and set it with the `data()` method on the `resource`
```rust
#[derive(Default)]
struct ExtractorConfig {
config: String,
}
impl FromRequest for YourExtractor {
type Error = Error;
type Future = Result<Self, Self::Error>;
type Config = ExtractorConfig;
fn from_request(req: &HttpRequest, payload: &mut Payload) -> Self::Future {
let cfg = req.app_data::<ExtractorConfig>();
println!("config data?: {:?}", cfg.unwrap().role);
...
}
}
App::new().service(
resource("/route_with_config")
.data(ExtractorConfig {
config: "test".to_string(),
})
.route(post().to(handler_fn)),
)
```
* Resource registration. 1.0 version uses generalized resource
registration via `.service()` method.