[][src]Struct rocket_contrib::templates::Metadata

pub struct Metadata<'a>(_);

Request guard for dynamiclly querying template metadata.

Usage

The Metadata type implements Rocket's FromRequest trait, so it can be used as a request guard in any request handler.

use rocket_contrib::templates::{Template, Metadata};

#[get("/")]
fn homepage(metadata: Metadata) -> Template {
    // Conditionally render a template if it's available.
    if metadata.contains_template("some-template") {
        Template::render("some-template", &context)
    } else {
        Template::render("fallback", &context)
    }
}


fn main() {
    rocket::ignite()
        .attach(Template::fairing())
        // ...
}

Methods

impl<'a> Metadata<'a>[src]

pub fn contains_template(&self, name: &str) -> bool[src]

Returns true if the template with the given name is currently loaded. Otherwise, returns false.

Example

use rocket_contrib::templates::Metadata;

#[get("/")]
fn handler(metadata: Metadata) {
    // Returns `true` if the template with name `"name"` was loaded.
    let loaded = metadata.contains_template("name");
}

pub fn reloading(&self) -> bool[src]

Returns true if template reloading is enabled.

Example

use rocket_contrib::templates::Metadata;

#[get("/")]
fn handler(metadata: Metadata) {
    // Returns `true` if template reloading is enabled.
    let reloading = metadata.reloading();
}

Trait Implementations

impl<'a, 'r> FromRequest<'a, 'r> for Metadata<'a>[src]

Retrieves the template metadata. If a template fairing hasn't been attached, an error is printed and an empty Err with status InternalServerError (500) is returned.

type Error = ()

The associated error to be returned if derivation fails.

Auto Trait Implementations

impl<'a> Send for Metadata<'a>

impl<'a> Sync for Metadata<'a>

Blanket Implementations

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> Typeable for T where
    T: Any

fn get_type(&self) -> TypeId

Get the TypeId of this object.

impl<T> IntoCollection<T> for T

impl<T, I> AsResult<T, I> for T where
    I: Input, 

impl<T> Erased for T

impl<T> IntoSql for T

fn into_sql<T>(self) -> Self::Expression where
    Self: AsExpression<T>, 

Convert self to an expression for Diesel's query builder. Read more

fn as_sql<'a, T>(&'a self) -> <&'a Self as AsExpression<T>>::Expression where
    &'a Self: AsExpression<T>, 

Convert &self to an expression for Diesel's query builder. Read more

impl<T> Same<T> for T

type Output = T

Should always be Self

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 

type Err = <U as TryFrom<T>>::Err