Struct actix_web::web::Form

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pub struct Form<T>(pub T);
Expand description

URL encoded payload extractor and responder.

Form has two uses: URL encoded responses, and extracting typed data from URL request payloads.

Extractor

To extract typed data from a request body, the inner type T must implement the DeserializeOwned trait.

Use FormConfig to configure extraction options.

Examples

use actix_web::{post, web};
use serde::Deserialize;

#[derive(Deserialize)]
struct Info {
    name: String,
}

// This handler is only called if:
// - request headers declare the content type as `application/x-www-form-urlencoded`
// - request payload deserializes into an `Info` struct from the URL encoded format
#[post("/")]
async fn index(web::Form(form): web::Form<Info>) -> String {
    format!("Welcome {}!", form.name)
}

Responder

The Form type also allows you to create URL encoded responses by returning a value of type Form<T> where T is the type to be URL encoded, as long as T implements Serialize.

Examples

use actix_web::{get, web};
use serde::Serialize;

#[derive(Serialize)]
struct SomeForm {
    name: String,
    age: u8
}

// Response will have:
// - status: 200 OK
// - header: `Content-Type: application/x-www-form-urlencoded`
// - body: `name=actix&age=123`
#[get("/")]
async fn index() -> web::Form<SomeForm> {
    web::Form(SomeForm {
        name: "actix".to_owned(),
        age: 123
    })
}

Panics

URL encoded forms consist of unordered key=value pairs, therefore they cannot be decoded into any type which depends upon data ordering (eg. tuples). Trying to do so will result in a panic.

Tuple Fields§

§0: T

Implementations§

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impl<T> Form<T>

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pub fn into_inner(self) -> T

Unwrap into inner T value.

Trait Implementations§

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impl<T: Debug> Debug for Form<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 Form<T>

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type Target = T

The resulting type after dereferencing.
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fn deref(&self) -> &T

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

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

Mutably dereferences the value.
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impl<T: Display> Display for Form<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> FromRequest for Form<T>where T: DeserializeOwned + 'static,

See here for example of usage as an extractor.

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type Error = Error

The associated error which can be returned.
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type Future = FormExtractFut<T>

Future that resolves to a Self. Read more
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fn from_request(req: &HttpRequest, payload: &mut Payload) -> Self::Future

Create a Self from request parts asynchronously.
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fn extract(req: &HttpRequest) -> Self::Future

Create a Self from request head asynchronously. Read more
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impl<T: Ord> Ord for Form<T>

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fn cmp(&self, other: &Form<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<Form<T>> for Form<T>

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fn eq(&self, other: &Form<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<Form<T>> for Form<T>

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fn partial_cmp(&self, other: &Form<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: Serialize> Responder for Form<T>

See here for example of usage as a handler return type.

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type Body = EitherBody<String, BoxBody>

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fn respond_to(self, _: &HttpRequest) -> HttpResponse<Self::Body>

Convert self to HttpResponse.
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fn customize(self) -> CustomizeResponder<Self>where Self: Sized,

Wraps responder to allow alteration of its response. Read more
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impl<T> Serialize for Form<T>where T: Serialize,

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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>where S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl<T: Eq> Eq for Form<T>

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impl<T> StructuralEq for Form<T>

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impl<T> StructuralPartialEq for Form<T>

Auto Trait Implementations§

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

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

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

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

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impl<T> UnwindSafe for Form<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<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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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, P> Resource for Twhere T: DerefMut<Target = Path<P>>, P: ResourcePath,

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type Path = P

Type of resource’s path returned in resource_path.
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fn resource_path(&mut self) -> &mut Path<<T as Resource>::Path>

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impl<T> Same<T> for T

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type Output = T

Should always be Self
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impl<T> ToString for Twhere T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> Formattable for Twhere T: Deref, <T as Deref>::Target: Formattable,

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impl<T> Parsable for Twhere T: Deref, <T as Deref>::Target: Parsable,