Enum UpdateNullable

pub enum UpdateNullable<T> {
    Keep,
    Unset,
    Change(T),
}

Clearer representation of an optional nullable field.

Requires #[serde(default, skip_serializing_if = "Update::is_keep")] to be applied to fields which use this type.

Variants

Keep

Use the current value stored in the database. Equivalent of undefined in JS.

Unset

Set the value to null or the equivalent.

Change(T)

Use the given value.

Implementations

impl<T> UpdateNullable<T>

pub const fn is_keep(&self) -> bool

Whether this is the Keep variant

pub const fn is_unset(&self) -> bool

Whether this is the Keep variant

pub const fn is_change(&self) -> bool

Whether this is the Change variant

pub fn into_option(self) -> Option<T>

Similar to Option<Option<T>>::flatten(), this converts the variant into an Option<T>.

Useful for coalesce updates.

Trait Implementations

impl<T: Clone> Clone for UpdateNullable<T>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for UpdateNullable<T>

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

Formats the value using the given formatter.

impl<T> Default for UpdateNullable<T>

fn default() -> UpdateNullable<T>

Returns the “default value” for a type.

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

where T: Deserialize<'de>,

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T> From<Option<T>> for UpdateNullable<T>

fn from(value: Option<T>) -> Self

Converts to this type from the input type.

impl<T> Serialize for UpdateNullable<T>

where T: Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.