Struct async_graphql::Lookahead

source · [−]

pub struct Lookahead<'a> { /* private fields */ }

Expand description

A selection performed by a query.

Implementations

source

impl<'a> Lookahead<'a>

source

pub fn field(&self, name: &str) -> Self

Get the field of the selection set with the specified name. This will ignore aliases.

For example, calling .field("a") on { a { b } } will return a lookahead that represents { b }.

source

pub fn exists(&self) -> bool

Returns true if field exists otherwise return false.

source

pub fn selection_fields(&self) -> Vec<SelectionField<'a>>ⓘNotable traits for Vec<u8, A>`impl<A> Write for Vec<u8, A> where A: Allocator,`

Get the SelectionFields for each of the fields covered by this Lookahead.

There will be multiple fields in situations where the same field is queried twice.

Trait Implementations

source

impl<'a> From<SelectionField<'a>> for Lookahead<'a>

source

fn from(selection_field: SelectionField<'a>) -> Self

Converts to this type from the input type.

source

impl<'a> TryFrom<&'_ [SelectionField<'a>]> for Lookahead<'a>

Convert a slice of SelectionFields to a Lookahead. Assumes all SelectionFields are from the same query and thus have the same fragments.

Fails if either no SelectionFields were provided.

type Error = ()

The type returned in the event of a conversion error.

source

fn try_from(
selection_fields: &[SelectionField<'a>]
) -> Result<Self, Self::Error>

Performs the conversion.

Auto Trait Implementations

impl<'a> !RefUnwindSafe for Lookahead<'a>

impl<'a> Send for Lookahead<'a>

impl<'a> Sync for Lookahead<'a>

impl<'a> Unpin for Lookahead<'a>

impl<'a> !UnwindSafe for Lookahead<'a>

Blanket Implementations

source

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

source

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

source

impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

source

impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

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

Mutably borrows from an owned value. Read more

source

impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

source

impl<T> FutureExt for T

source

fn with_context(self, otel_cx: Context) -> WithContext<Self>

Attaches the provided Context to this type, returning a WithContext wrapper. Read more

source

fn with_current_context(self) -> WithContext<Self>

Attaches the current Context to this type, returning a WithContext wrapper. Read more

source

impl<T> Instrument for T

source

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

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

source

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

source

impl<T> Instrument for T

source

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

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

source

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

source

impl<T, U> Into for T where
U: From<T>,

const: unstable · source

fn into(self) -> U

Calls U::from(self).

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

source

impl<T> Same<T> for T

type Output = T

Should always be Self

source

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

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

Performs the conversion.

source

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

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

impl<V, T> VZip<V> for T where
V: MultiLane<T>,

fn vzip(self) -> V

source

impl<T> WithSubscriber for T

source

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

source

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more

source

impl<T> WithSubscriber for T

source

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

source

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more

Struct async_graphql::Lookahead

Implementations

impl<'a> Lookahead<'a>

pub fn field(&self, name: &str) -> Self

pub fn exists(&self) -> bool

pub fn selection_fields(&self) -> Vec<SelectionField<'a>>ⓘNotable traits for Vec<u8, A>impl<A> Write for Vec<u8, A> where A: Allocator,

Trait Implementations

impl<'a> From<SelectionField<'a>> for Lookahead<'a>

fn from(selection_field: SelectionField<'a>) -> Self

impl<'a> TryFrom<&'_ [SelectionField<'a>]> for Lookahead<'a>

type Error = ()

fn try_from( selection_fields: &[SelectionField<'a>]) -> Result<Self, Self::Error>

Auto Trait Implementations

impl<'a> !RefUnwindSafe for Lookahead<'a>

impl<'a> Send for Lookahead<'a>

impl<'a> Sync for Lookahead<'a>

impl<'a> Unpin for Lookahead<'a>

impl<'a> !UnwindSafe for Lookahead<'a>

Blanket Implementations

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

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where T: ?Sized,

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

impl<T> From<T> for T

fn from(t: T) -> T

impl<T> FutureExt for T

fn with_context(self, otel_cx: Context) -> WithContext<Self>

fn with_current_context(self) -> WithContext<Self>

impl<T> Instrument for T

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

fn in_current_span(self) -> Instrumented<Self>

impl<T> Instrument for T

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

fn in_current_span(self) -> Instrumented<Self>

impl<T, U> Into<U> for T where U: From<T>,

fn into(self) -> U

impl<T> Same<T> for T

type Output = T

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

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

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

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

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

impl<V, T> VZip<V> for T where V: MultiLane<T>,

fn vzip(self) -> V

impl<T> WithSubscriber for T

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

fn with_current_subscriber(self) -> WithDispatch<Self>

impl<T> WithSubscriber for T

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

fn with_current_subscriber(self) -> WithDispatch<Self>

pub fn selection_fields(&self) -> Vec<SelectionField<'a>>ⓘNotable traits for Vec<u8, A>`impl<A> Write for Vec<u8, A> where A: Allocator,`

fn try_from(
selection_fields: &[SelectionField<'a>]
) -> Result<Self, Self::Error>

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

impl<T> Borrow<T> for T where
T: ?Sized,

impl<T> BorrowMut<T> for T where
T: ?Sized,

impl<T, U> Into<U> for T where
U: From<T>,

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

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

impl<V, T> VZip<V> for T where
V: MultiLane<T>,

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

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