pub enum ViewUpdatePolicy {
    Lazy,
    Eager,
    Unique,
}
Expand description

The policy under which a View is updated when documents are saved.

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Lazy

The view is updated when a query is made. If a document is updated multiple times between queries, the view will only be updated when the query is executed.

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Eager

The view is updated during the transaction where documents are being inserted, updated, or removed.

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Unique

No two documents may emit the same key. Unique views are updated when the document is saved, allowing for this check to be done atomically. When a document is updated, all unique views will be updated, and if any of them fail, the document will not be allowed to update and an Error::UniqueKeyViolation will be returned.

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impl ViewUpdatePolicy

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pub const fn is_eager(&self) -> bool

Returns true if the view should be updated eagerly.

This returns true if the policy is either Eager or Unique.

Trait Implementations§

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impl Clone for ViewUpdatePolicy

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fn clone(&self) -> ViewUpdatePolicy

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for ViewUpdatePolicy

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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 Default for ViewUpdatePolicy

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fn default() -> ViewUpdatePolicy

Returns the “default value” for a type. Read more
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impl<'de> Deserialize<'de> for ViewUpdatePolicy

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Display for ViewUpdatePolicy

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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 PartialEq for ViewUpdatePolicy

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fn eq(&self, other: &ViewUpdatePolicy) -> 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 Serialize for ViewUpdatePolicy

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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 Copy for ViewUpdatePolicy

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impl Eq for ViewUpdatePolicy

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impl StructuralEq for ViewUpdatePolicy

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impl StructuralPartialEq for ViewUpdatePolicy

Auto Trait Implementations§

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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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where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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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> 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>

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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> Same for T

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type Output = T

Should always be Self
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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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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> ToString for T
where 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 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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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

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where T: Display + Clone + Serialize + for<'de> Deserialize<'de> + Send + Sync + Debug,

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