Struct UserMetadata 

pub struct UserMetadata {
    pub fields: HashMap<String, MetadataValue>,
}

User-defined metadata for a document

Fields

fields: HashMap<String, MetadataValue>

Field name -> value mapping

Implementations

impl UserMetadata

pub fn new() -> Self

Create empty metadata

pub fn add(&mut self, key: impl Into<String>, value: MetadataValue) -> &mut Self

Add a metadata field

pub fn get(&self, key: &str) -> Option<&MetadataValue>

Get a metadata field

pub fn remove(&mut self, key: &str) -> Option<MetadataValue>

Remove a metadata field

pub fn contains(&self, key: &str) -> bool

Check if a field exists

pub fn to_json(&self) -> Result<String>

Serialize to JSON string

pub fn from_json(json: &str) -> Result<Self>

Deserialize from JSON string

pub fn merge(&mut self, other: &UserMetadata)

Merge with another metadata instance (other takes precedence)

Trait Implementations

impl Clone for UserMetadata

fn clone(&self) -> UserMetadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for UserMetadata

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

Formats the value using the given formatter.

impl Default for UserMetadata

fn default() -> UserMetadata

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for UserMetadata

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for UserMetadata

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

where __S: Serializer,

Serialize this value into the given Serde serializer.