[−][src]Enum cqrs_core::Precondition
A precondition that must be upheld for a command to be executed or for events to be persisted.
Variants
New
Requires that the target aggregate must not have had any events previously applied to it.
Exists
Requires that the target event at least exist, whether as a snapshot, or as having had at least one event applied.
ExpectedVersion(Version)
Requires that the target aggregate have the exact version specified.
Methods
impl Precondition
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pub fn verify(self, current_version: Option<Version>) -> Result<(), Self>
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Verifies that the precondition holds, given the current_version
. If the precondition is violated, an error is
returned with the precondition.
Trait Implementations
impl Eq for Precondition
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impl Copy for Precondition
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impl PartialEq<Precondition> for Precondition
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fn eq(&self, other: &Precondition) -> bool
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fn ne(&self, other: &Precondition) -> bool
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impl From<Version> for Precondition
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impl Clone for Precondition
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fn clone(&self) -> Precondition
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fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl Display for Precondition
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impl Debug for Precondition
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impl Hash for Precondition
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Auto Trait Implementations
impl Send for Precondition
impl Sync for Precondition
Blanket Implementations
impl<T, U> Into for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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impl<T> From for T
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impl<T> ToString for T where
T: Display + ?Sized,
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T: Display + ?Sized,
impl<T, U> TryFrom for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T> Borrow for T where
T: ?Sized,
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T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> BorrowMut for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T, U> TryInto for T where
U: TryFrom<T>,
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U: TryFrom<T>,