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<(), Error>

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<ViewUpdatePolicy, <__D as Deserializer<'de>>::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<(), Error>

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 as Serializer>::Ok, <__S as Serializer>::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

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impl<T> Any for T
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fn type_id(&self) -> TypeId

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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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fn from(t: T) -> 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 into(self) -> U

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type Output = T

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where T: Clone,

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type Owned = T

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