[][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>
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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");
}

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.

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 for T
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impl<T, U> Into for T where
    U: From<T>, 
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impl<T, U> TryFrom for T where
    T: From<U>, 
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🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

impl<T> Borrow for T where
    T: ?Sized
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impl<T> Any for T where
    T: 'static + ?Sized
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impl<T, U> TryInto for T where
    U: TryFrom<T>, 
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🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

impl<T> BorrowMut for T where
    T: ?Sized
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impl<T> Typeable for T where
    T: Any

Get the TypeId of this object.

impl<T> IntoCollection for T

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

impl<T> IntoSql for T

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

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

impl<T> Same for T

Should always be Self

impl<T> Erased for T

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