Type Alias FlashMessage

pub type FlashMessage<'a, 'r> = Flash<&'a Request<'r>>;

Type alias to retrieve Flash messages from a request.

Flash Cookie

A FlashMessage holds the parsed contents of the flash cookie. As long as there is a flash cookie present (set by the Flash Responder), a FlashMessage request guard will succeed.

The flash cookie is cleared if either the name() or msg() method is called. If neither method is called, the flash cookie is not cleared.

Aliased Type

struct FlashMessage<'a, 'r> { /* private fields */ }

Implementations

impl<'a, 'r> Flash<&'a Request<'r>>

pub fn name(&self) -> &str

Returns the name of this message.

pub fn msg(&self) -> &str

Returns the msg contents of this message.

impl<'r, R: Responder<'r>> Flash<R>

pub fn new<N: AsRef<str>, M: AsRef<str>>(res: R, name: N, msg: M) -> Flash<R>

Constructs a new Flash message with the given name, msg, and underlying responder.

Examples

Construct a “suggestion” message with contents “Try this out!” that redirects to “/”.

use rocket::response::{Redirect, Flash};

let msg = Flash::new(Redirect::to("/"), "suggestion", "Try this out!");

pub fn success<S: AsRef<str>>(responder: R, msg: S) -> Flash<R>

Constructs a “success” Flash message with the given responder and msg.

Examples

Construct a “success” message with contents “It worked!” that redirects to “/”.

use rocket::response::{Redirect, Flash};

let msg = Flash::success(Redirect::to("/"), "It worked!");

pub fn warning<S: AsRef<str>>(responder: R, msg: S) -> Flash<R>

Constructs a “warning” Flash message with the given responder and msg.

Examples

Construct a “warning” message with contents “Watch out!” that redirects to “/”.

use rocket::response::{Redirect, Flash};

let msg = Flash::warning(Redirect::to("/"), "Watch out!");

pub fn error<S: AsRef<str>>(responder: R, msg: S) -> Flash<R>

Constructs an “error” Flash message with the given responder and msg.

Examples

Construct an “error” message with contents “Whoops!” that redirects to “/”.

use rocket::response::{Redirect, Flash};

let msg = Flash::error(Redirect::to("/"), "Whoops!");

Trait Implementations

impl<R: Debug> Debug for Flash<R>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a, 'r> FromRequest<'a, 'r> for Flash<&'a Request<'r>>

Retrieves a flash message from a flash cookie. If there is no flash cookie, or if the flash cookie is malformed, an empty Err is returned.

The suggested use is through an Option and the FlashMessage type alias in request: Option<FlashMessage>.

type Error = ()

The associated error to be returned if derivation fails.

fn from_request(req: &'a Request<'r>) -> Outcome<Self, Self::Error>

Derives an instance of Self from the incoming request metadata.

impl<'r, R: Responder<'r>> Responder<'r> for Flash<R>

Sets the message cookie and then uses the wrapped responder to complete the response. In other words, simply sets a cookie and delegates the rest of the response handling to the wrapped responder. As a result, the Outcome of the response is the Outcome of the wrapped Responder.

fn respond_to(self, req: &Request<'_>) -> Result<Response<'r>, Status>

Returns Ok if a Response could be generated successfully. Otherwise, returns an Err with a failing Status.