Struct Metadata 

pub struct Metadata {
    pub id: Uuid,
    pub created_at: DateTime<Utc>,
    pub updated_at: DateTime<Utc>,
    pub version: i64,
    pub extra: HashMap<String, Value>,
}

Common metadata for all models

Fields

id: Uuid

Unique identifier

created_at: DateTime<Utc>

Creation timestamp

updated_at: DateTime<Utc>

Last update timestamp

version: i64

Version for optimistic locking

extra: HashMap<String, Value>

Additional metadata

Implementations

impl Metadata

pub fn new() -> Self

Create new metadata

pub fn touch(&mut self)

Update the timestamp and increment version

pub fn set_extra<K: Into<String>, V: Into<Value>>(&mut self, key: K, value: V)

Set extra metadata

pub fn get_extra(&self, key: &str) -> Option<&Value>

Get extra metadata

Trait Implementations

impl Clone for Metadata

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Metadata

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

Formats the value using the given formatter.

impl Default for Metadata

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Metadata

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Metadata

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

where __S: Serializer,

Serialize this value into the given Serde serializer.