Struct rocket::form::Lenient

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pub struct Lenient<T>(/* private fields */);
Expand description

A form guard for parsing form types leniently.

This type implements the FromForm trait and thus can be used as a generic parameter to the Form data guard: Form<Lenient<T>>, where T implements FromForm. Unlike using Form directly, this type uses a lenient parsing strategy.

Lenient Parsing

A Lenient<T> will parse successfully from an incoming form even if the form contains extra or missing fields. If fields are missing, the form field type’s default will be used, if there is one. Extra fields are ignored; only the first is parsed and validated. This is the default strategy for Form.

Usage

Lenient<T> implements FromForm as long as T implements FromForm. As such, Form<Lenient<T>> is a data guard.

Note that Form<T> already parses leniently, so a Form<Lenient<T>> is redundant and equal to Form<T>. Lenient, however, can be used to make otherwise strict parses lenient, for example, in Option<Lenient<T>>:

use rocket::form::Lenient;

#[derive(FromForm)]
struct UserInput {
    // Parses as `Some(false)` when `lenient_inner_option` isn't present.
    // Without `Lenient`, this would otherwise parse as `None`.
    lenient_inner_option: Option<Lenient<bool>>,
}

Implementations§

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impl<T> Lenient<T>

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pub fn into_inner(self) -> T

Consumes self and returns the inner value.

Note that since Lenient implements Deref and DerefMut with target T, reading and writing an inner value can be accomplished transparently.

Example
use rocket::form::{Form, Lenient};

#[derive(FromForm)]
struct MyForm {
    field: String,
}

#[post("/submit", data = "<form>")]
fn submit(form: Form<Lenient<MyForm>>) -> String {
    // We can read or mutate a value transparently:
    let field: &str = &form.field;

    // To gain ownership, however, use `into_inner()`:
    form.into_inner().into_inner().field
}

Trait Implementations§

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impl<T: Debug> Debug for Lenient<T>

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

Formats the value using the given formatter. Read more
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impl<T> Deref for Lenient<T>

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type Target = T

The resulting type after dereferencing.
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fn deref(&self) -> &Self::Target

Dereferences the value.
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impl<T> DerefMut for Lenient<T>

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fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.
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impl<T> From<T> for Lenient<T>

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fn from(val: T) -> Lenient<T>

Converts to this type from the input type.
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impl<'v, T: FromForm<'v>> FromForm<'v> for Lenient<T>

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type Context = <T as FromForm<'v>>::Context

The form guard’s parsing context.
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fn init(opts: Options) -> Self::Context

Initializes and returns the parsing context for Self.
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fn push_value(ctxt: &mut Self::Context, field: ValueField<'v>)

Processes the value field field.
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fn push_data<'life0, 'life1, 'async_trait>( ctxt: &'life0 mut Self::Context, field: DataField<'v, 'life1> ) -> Pin<Box<dyn Future<Output = ()> + Send + 'async_trait>>where Self: 'async_trait, 'v: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Processes the data field field.
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fn finalize(this: Self::Context) -> Result<'v, Self>

Finalizes parsing. Returns the parsed value when successful or collection of Errors otherwise.
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fn push_error(_ctxt: &mut Self::Context, _error: Error<'r>)

Processes the external form or field error _error. Read more
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fn default(opts: Options) -> Option<Self>

Returns a default value, if any, to use when a value is desired and parsing fails. Read more
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impl<'f, A, T: FromUriParam<Query, A> + FromForm<'f>> FromUriParam<Query, A> for Lenient<T>

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type Target = <T as FromUriParam<Query, A>>::Target

The resulting type of this conversion.
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fn from_uri_param(param: A) -> Self::Target

Converts a value of type T into a value of type Self::Target. The resulting value of type Self::Target will be rendered into a URI using its UriDisplay implementation.
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impl<T: Hash> Hash for Lenient<T>

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<T: Ord> Ord for Lenient<T>

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fn cmp(&self, other: &Lenient<T>) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval. Read more
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impl<T: PartialEq> PartialEq<Lenient<T>> for Lenient<T>

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fn eq(&self, other: &Lenient<T>) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T: PartialOrd> PartialOrd<Lenient<T>> for Lenient<T>

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fn partial_cmp(&self, other: &Lenient<T>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl<T: Eq> Eq for Lenient<T>

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impl<T> StructuralEq for Lenient<T>

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impl<T> StructuralPartialEq for Lenient<T>

Auto Trait Implementations§

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impl<T> RefUnwindSafe for Lenient<T>where T: RefUnwindSafe,

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impl<T> Send for Lenient<T>where T: Send,

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impl<T> Sync for Lenient<T>where T: Sync,

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impl<T> Unpin for Lenient<T>where T: Unpin,

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impl<T> UnwindSafe for Lenient<T>where T: UnwindSafe,

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<Q, K> Comparable<K> for Qwhere Q: Ord + ?Sized, K: Borrow<Q> + ?Sized,

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fn compare(&self, key: &K) -> Ordering

Compare self to key and return their ordering.
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impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> From<!> for T

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fn from(t: !) -> T

Converts to this type from the input type.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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Calls U::from(self).

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Converts self into a collection.
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fn mapped<U, F, A>(self, f: F) -> SmallVec<A>where F: FnMut(T) -> U, A: Array<Item = U>,

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impl<T> Paint for Twhere T: ?Sized,

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Returns a styled value derived from self with the foreground set to value.

This method should be used rarely. Instead, prefer to use color-specific builder methods like red() and green(), which have the same functionality but are pithier.

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Set foreground color to white using fg():

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Returns self with the fg() set to Color::Magenta.

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Returns a styled value derived from self with the background set to value.

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Returns self with the bg() set to Color::Fixed.

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Returns self with the bg() set to Color::Yellow.

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Returns self with the bg() set to Color::Blue.

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Returns self with the bg() set to Color::Magenta.

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Returns self with the bg() set to Color::Cyan.

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Returns self with the bg() set to Color::BrightRed.

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Returns self with the bg() set to Color::BrightGreen.

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Returns self with the bg() set to Color::BrightYellow.

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Returns self with the bg() set to Color::BrightBlue.

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Returns self with the bg() set to Color::BrightMagenta.

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Returns self with the bg() set to Color::BrightCyan.

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Returns self with the bg() set to Color::BrightWhite.

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Enables the styling Attribute value.

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