Struct rocket_contrib::templates::Metadata [−][src]
pub struct Metadata<'a>(_);
Expand description
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()) // ... }
Implementations
impl<'a> Metadata<'a>
[src]
impl<'a> Metadata<'a>
[src]pub fn contains_template(&self, name: &str) -> bool
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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"); }
Trait Implementations
impl<'a, 'r> FromRequest<'a, 'r> for Metadata<'a>
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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.
Auto Trait Implementations
impl<'a> RefUnwindSafe for Metadata<'a>
impl<'a> Send for Metadata<'a>
impl<'a> Sync for Metadata<'a>
impl<'a> Unpin for Metadata<'a>
impl<'a> UnwindSafe for Metadata<'a>
Blanket Implementations
impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]
impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]pub fn borrow_mut(&mut self) -> &mut T
[src]
pub fn borrow_mut(&mut self) -> &mut T
[src]Mutably borrows from an owned value. Read more
impl<T> IntoCollection<T> for T
impl<T> IntoCollection<T> for T
pub fn into_collection<A>(self) -> SmallVec<A> where
A: Array<Item = T>,
pub fn into_collection<A>(self) -> SmallVec<A> where
A: Array<Item = T>,
Converts self
into a collection.
pub fn mapped<U, F, A>(self, f: F) -> SmallVec<A> where
F: FnMut(T) -> U,
A: Array<Item = U>,
F: FnMut(T) -> U,
A: Array<Item = U>,
impl<T> IntoSql for T
[src]
impl<T> IntoSql for T
[src]fn into_sql<T>(self) -> Self::Expression where
Self: AsExpression<T>,
[src]
fn into_sql<T>(self) -> Self::Expression where
Self: AsExpression<T>,
[src]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>,
[src]
fn as_sql<'a, T>(&'a self) -> <&'a Self as AsExpression<T>>::Expression where
&'a Self: AsExpression<T>,
[src]Convert &self
to an expression for Diesel’s query builder. Read more
impl<T> Same<T> for T
impl<T> Same<T> for T
type Output = T
type Output = T
Should always be Self
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
impl<V, T> VZip<V> for T where
V: MultiLane<T>,