Trait DefaultProvider 

pub trait DefaultProvider: Send + Sync {
    // Required methods
    fn default_bytes(&self, field: &str, type_name: &str) -> Option<Vec<u8>>;
    fn default_string(&self, field: &str, type_name: &str) -> Option<String>;
    fn has_default(&self, field: &str) -> bool;
    fn fields_with_defaults(&self) -> Vec<String>;
}

Default value provider for schema fields.

Implementations provide default values for fields in a schema, which are used when migrating data from older versions that lack certain fields.

Required Methods

fn default_bytes(&self, field: &str, type_name: &str) -> Option<Vec<u8>>

Get the default value for a field as bytes.

Arguments

• field - The field name
• type_name - The field’s type name

Returns

The default value as bytes (for arena storage), or None if no default.

fn default_string(&self, field: &str, type_name: &str) -> Option<String>

Get the default value for a field as a string representation.

This is useful for debugging and display purposes.

fn has_default(&self, field: &str) -> bool

Check if a field has a default value.

fn fields_with_defaults(&self) -> Vec<String>

Get all fields that have defaults.

Implementors

impl DefaultProvider for MapDefaultProvider