Enum Patch 

pub enum Patch<T> {
    Undefined,
    Null,
    Value(T),
}

Represents a field in a PATCH request with three states:

• Undefined: Field not present in JSON - don’t change existing value
• Null: Field present with null value - set to NULL in database
• Value(T): Field present with value - update to this value

Variants

Undefined

Field not present in request - no change

Null

Field present with null value - delete/set to NULL

Value(T)

Field present with value - update to this value

Implementations

impl<T> Patch<T>

pub fn is_undefined(&self) -> bool

Returns true if this is Undefined

pub fn is_null(&self) -> bool

Returns true if this is Null

pub fn is_value(&self) -> bool

Returns true if this is Value(_)

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

Returns the value if Value, otherwise None

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

Converts to Option: Undefined -> None, Null -> Some(None), Value(v) -> Some(Some(v))

pub fn map<U, F>(self, f: F) -> Patch<U>

where F: FnOnce(T) -> U,

Maps a Patch<T> to Patch<U> by applying a function to the contained value

Trait Implementations

impl<T> Clone for Patch<T>

where T: Clone,

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T> Debug for Patch<T>

where T: Debug,

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

Formats the value using the given formatter.

impl<T> Default for Patch<T>

fn default() -> Patch<T>

Returns the “default value” for a type.

impl<'de, T> Deserialize<'de> for Patch<T>

where T: Deserialize<'de>,

fn deserialize<D>( deserializer: D, ) -> Result<Patch<T>, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T> PartialEq for Patch<T>

where T: PartialEq,

fn eq(&self, other: &Patch<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> Serialize for Patch<T>

where T: Serialize,

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.

impl<T> Copy for Patch<T>

where T: Copy,

impl<T> Eq for Patch<T>

where T: Eq,

impl<T> StructuralPartialEq for Patch<T>