Struct LazyNavigation 

pub struct LazyNavigation<T> { /* private fields */ }

Opt-in lazy single navigation wrapper.

This type never performs I/O by itself. It only records whether a related value has been explicitly loaded by an ORM operation such as include(...) or a future explicit lazy-loading API that receives a context-bearing value.

Implementations

impl<T> LazyNavigation<T>

pub const fn unloaded() -> Self

Creates an unloaded lazy navigation.

pub fn loaded(value: T) -> Self

Creates a loaded lazy navigation containing a related entity.

pub fn from_option(value: Option<T>) -> Self

Creates a loaded lazy navigation from an optional related entity.

pub fn is_loaded(&self) -> bool

Returns whether a load operation has populated this wrapper.

pub fn as_ref(&self) -> Option<&T>

Returns the loaded related entity when one is present.

This is a memory-only accessor. It never executes SQL.

pub fn set_loaded(&mut self, value: Option<T>)

Replaces the loaded value and marks this wrapper as loaded.

pub fn clear(&mut self)

Clears the cached value and marks this wrapper as unloaded.

Trait Implementations

impl<T: Clone> Clone for LazyNavigation<T>

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for LazyNavigation<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T> Default for LazyNavigation<T>

fn default() -> Self

Returns the “default value” for a type.

impl<T: PartialEq> PartialEq for LazyNavigation<T>

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: Eq> Eq for LazyNavigation<T>

impl<T> StructuralPartialEq for LazyNavigation<T>