[−][src]Trait hyperdrive::RequestContext

pub trait RequestContext: AsRef<Self> + AsRef<NoContext> { }

Trait for context types passed to FromRequest, FromBody and Guard.

#[derive(RequestContext)]

This trait can be derived automatically. This will also implement AsRef<Self> and AsRef<NoContext>.

On structs, fields can also be annotated using #[as_ref], which generates an additional implementation of AsRef for that field (note that all #[as_ref] fields must have distinct types). This will automatically use the field's type as a context when required by a FromRequest impl.

Examples

Create your own context that allows running database queries in Guards and elsewhere:

#[derive(RequestContext)]
struct MyContext {
    db: ConnectionPool,
}

Create a context that contains the above context and additional data:

#[derive(RequestContext)]
struct BigContext {
    #[as_ref]
    inner: MyContext,
    logger: Logger,
}

This context can be used in the same places where MyContext is accepted, but provides additional data that may be used only by a few Guard, FromRequest or FromBody implementations.

Implementors

impl RequestContext for NoContext[src]

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