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FieldDiff

autumn_web::hooks

Struct FieldDiff 

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pub struct FieldDiff<T> { /* private fields */ }
Expand description

Per-field before/after diff accessor for mutation hooks.

FieldDiff<T> holds the previous and proposed values for a single field, allowing hook authors to inspect what changed and optionally override the new value via set.

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impl<T: PartialEq> FieldDiff<T>

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pub const fn new(before: T, after: T) -> Self

Create a new diff from before and after values.

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pub const fn before(&self) -> &T

Reference to the value before the mutation.

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pub const fn after(&self) -> &T

Reference to the (possibly overridden) value after the mutation.

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pub fn changed(&self) -> bool

Returns true if the field value changed.

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pub fn unchanged(&self) -> bool

Returns true if the field value did not change.

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pub fn changed_to(&self, value: &T) -> bool

Returns true if the field changed and the new value equals value.

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pub fn changed_from(&self, value: &T) -> bool

Returns true if the field changed and the old value equals value.

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pub fn set(&mut self, value: T)

Override the after value. Does not affect before.

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impl<T: PartialEq> FieldDiff<Option<T>>

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pub const fn was_set(&self) -> bool

Returns true if the field went from None to Some.

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pub const fn was_cleared(&self) -> bool

Returns true if the field went from Some to None.

Trait Implementations§

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impl<T: Clone> Clone for FieldDiff<T>

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fn clone(&self) -> FieldDiff<T>

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T: Debug> Debug for FieldDiff<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: PartialEq> PartialEq for FieldDiff<T>

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

Tests for self and other values to be equal, and is used by ==.
1.0.0 (const: unstable) · Source§

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T: Eq> Eq for FieldDiff<T>

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impl<T> StructuralPartialEq for FieldDiff<T>

Auto Trait Implementations§

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impl<T> Freeze for FieldDiff<T>
where T: Freeze,

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

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

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

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

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impl<T> UnsafeUnpin for FieldDiff<T>
where T: UnsafeUnpin,

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

Blanket Implementations§

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impl<T> AggregateExpressionMethods for T

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fn aggregate_distinct(self) -> Self::Output
where Self: DistinctDsl,

DISTINCT modifier for aggregate functions Read more
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fn aggregate_all(self) -> Self::Output
where Self: AllDsl,

ALL modifier for aggregate functions Read more
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fn aggregate_filter<P>(self, f: P) -> Self::Output
where P: AsExpression<Bool>, Self: FilterDsl<<P as AsExpression<Bool>>::Expression>,

Add an aggregate function filter Read more
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fn aggregate_order<O>(self, o: O) -> Self::Output
where Self: OrderAggregateDsl<O>,

Add an aggregate function order Read more
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impl<T> Any for T
where 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 T
where 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 T
where 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<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> Downcast for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

Converts Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>, which can then be downcast into Box<dyn ConcreteType> where ConcreteType implements Trait.
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Converts Rc<Trait> (where Trait: Downcast) to Rc<Any>, which can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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fn as_any(&self) -> &(dyn Any + 'static)

Converts &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Converts &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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impl<T> DowncastSend for T
where T: Any + Send,

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fn into_any_send(self: Box<T>) -> Box<dyn Any + Send>

Converts Box<Trait> (where Trait: DowncastSend) to Box<dyn Any + Send>, which can then be downcast into Box<ConcreteType> where ConcreteType implements Trait.
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impl<T> DowncastSync for T
where T: Any + Send + Sync,

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fn into_any_sync(self: Box<T>) -> Box<dyn Any + Send + Sync>

Converts Box<Trait> (where Trait: DowncastSync) to Box<dyn Any + Send + Sync>, which can then be downcast into Box<ConcreteType> where ConcreteType implements Trait.
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fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Send + Sync> ⓘ

Converts Arc<Trait> (where Trait: DowncastSync) to Arc<Any>, which can then be downcast into Arc<ConcreteType> where ConcreteType implements Trait.
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impl<Q, K> Equivalent<K> for Q
where 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> FromRef<T> for T
where T: Clone,

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fn from_ref(input: &T) -> T

Converts to this type from a reference to the input type.
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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 T
where 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> IntoSql for T

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fn into_sql<T>(self) -> Self::Expression
where Self: Sized + AsExpression<T>, T: SqlType + TypedExpressionType,

Convert self to an expression for Diesel’s query builder. Read more
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fn as_sql<'a, T>(&'a self) -> <&'a Self as AsExpression<T>>::Expression
where &'a Self: AsExpression<T>, T: SqlType + TypedExpressionType,

Convert &self to an expression for Diesel’s query builder. Read more
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impl<T> Pointable for T

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const ALIGN: usize

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> PolicyExt for T
where T: ?Sized,

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fn and<P, B, E>(self, other: P) -> And<T, P>
where T: Policy<B, E>, P: Policy<B, E>,

Create a new Policy that returns Action::Follow only if self and other return Action::Follow. Read more
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fn or<P, B, E>(self, other: P) -> Or<T, P>
where T: Policy<B, E>, P: Policy<B, E>,

Create a new Policy that returns Action::Follow if either self or other returns Action::Follow. Read more
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impl<T> RepositoryHooksClone for T
where T: Clone,

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fn autumn_clone(&self) -> T

Clone hook state for generated repository values.
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impl<T, Conn> RunQueryDsl<Conn> for T

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fn execute<'conn, 'query>( self, conn: &'conn mut Conn, ) -> <Conn as AsyncConnectionCore>::ExecuteFuture<'conn, 'query>
where Conn: AsyncConnectionCore + Send, Self: ExecuteDsl<Conn> + 'query,

Executes the given command, returning the number of rows affected. Read more
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fn load<'query, 'conn, U>( self, conn: &'conn mut Conn, ) -> AndThen<Self::LoadFuture<'conn>, TryCollect<Self::Stream<'conn>, Vec<U>>>
where U: Send, Conn: AsyncConnectionCore, Self: LoadQuery<'query, Conn, U> + 'query,

Executes the given query, returning a Vec with the returned rows. Read more
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fn load_stream<'conn, 'query, U>( self, conn: &'conn mut Conn, ) -> Self::LoadFuture<'conn>
where Conn: AsyncConnectionCore, U: 'conn, Self: LoadQuery<'query, Conn, U> + 'query,

Executes the given query, returning a [Stream] with the returned rows. Read more
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fn get_result<'query, 'conn, U>( self, conn: &'conn mut Conn, ) -> AndThen<Self::LoadFuture<'conn>, LoadNext<Pin<Box<Self::Stream<'conn>>>>>
where U: Send + 'conn, Conn: AsyncConnectionCore, Self: LoadQuery<'query, Conn, U> + 'query,

Runs the command, and returns the affected row. Read more
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fn get_results<'query, 'conn, U>( self, conn: &'conn mut Conn, ) -> AndThen<Self::LoadFuture<'conn>, TryCollect<Self::Stream<'conn>, Vec<U>>>
where U: Send, Conn: AsyncConnectionCore, Self: LoadQuery<'query, Conn, U> + 'query,

Runs the command, returning an Vec with the affected rows. Read more
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fn first<'query, 'conn, U>( self, conn: &'conn mut Conn, ) -> AndThen<<Self::Output as LoadQuery<'query, Conn, U>>::LoadFuture<'conn>, LoadNext<Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>>>>>
where U: Send + 'conn, Conn: AsyncConnectionCore, Self: LimitDsl, Self::Output: LoadQuery<'query, Conn, U> + Send + 'query,

Attempts to load a single record. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> Scoped for T
where T: Send + Sync + 'static,

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fn scope(ctx: &PolicyContext) -> ScopeQuery<'_, Self>

Open a deferred ScopeQuery for this type. Resolves the registered scope at .load() time, not here.
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where 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 T
where 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 T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WindowExpressionMethods for T

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fn over(self) -> Self::Output
where Self: OverDsl,

Turn a function call into a window function call Read more
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fn window_filter<P>(self, f: P) -> Self::Output
where P: AsExpression<Bool>, Self: FilterDsl<<P as AsExpression<Bool>>::Expression>,

Add a filter to the current window function Read more
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fn partition_by<E>(self, expr: E) -> Self::Output
where Self: PartitionByDsl<E>,

Add a partition clause to the current window function Read more
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fn window_order<E>(self, expr: E) -> Self::Output
where Self: OrderWindowDsl<E>,

Add a order clause to the current window function Read more
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fn frame_by<E>(self, expr: E) -> Self::Output
where Self: FrameDsl<E>,

Add a frame clause to the current window function Read more
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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<A, B, T> HttpServerConnExec<A, B> for T
where B: Body,