Struct WritePreconditions 

pub struct WritePreconditions { /* private fields */ }

Optional identity and version checks for a resource write.

When both values are present, both must match the current resource.

Implementations

impl WritePreconditions

pub const fn new() -> Self

Creates empty preconditions.

pub fn from_task(task: &Task) -> ModelResult<Self>

Captures resource identity and version.

Errors

Returns ModelError::Invalid for a resource not yet stored.

pub fn with_uid(self, uid: Uid) -> Self

Requires this resource UID.

pub fn with_resource_version( self, resource_version: impl Into<String>, ) -> ModelResult<Self>

Requires this resource version.

Errors

Returns ModelError::Invalid when the value is empty.

pub fn uid(&self) -> Option<&Uid>

Expected resource UID, when present.

pub fn resource_version(&self) -> Option<&str>

Expected resource version, when present.

pub fn is_empty(&self) -> bool

Returns whether no checks are set.

Trait Implementations

impl Clone for WritePreconditions

fn clone(&self) -> WritePreconditions

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WritePreconditions

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

Formats the value using the given formatter.

impl Default for WritePreconditions

fn default() -> WritePreconditions

Returns the “default value” for a type.

impl Eq for WritePreconditions

impl PartialEq for WritePreconditions

fn eq(&self, other: &WritePreconditions) -> bool

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for WritePreconditions