Struct NestedFieldExtractor 

pub struct NestedFieldExtractor { /* private fields */ }

Extracts a potentially nested scalar field value using a pre-defined path.

This struct allows specifying a path as a sequence of field names. It uses the FieldValueExtractorSerializer internally to traverse the structure.

Implementations

impl NestedFieldExtractor

pub fn new_from_path<S: AsRef<str>>( path_segments: &[S], ) -> Result<Self, EvaluateError>

Creates a new NestedFieldExtractor from a slice of path segments.

Each element in the input slice represents a step in the path.

Arguments

• path_segments: A slice where each element can be converted into a &str (e.g., &str, String).

Errors

Returns EvaluateError::InvalidPath if the input slice is empty or if any segment converts to an empty string.

pub fn evaluate<T: Serialize>( &self, value: &T, ) -> Result<FieldScalarValue, EvaluateError>

Evaluates the extractor against the given serializable value using the configured path.

This triggers the serialization process, traversing the nested structure according to path_segments and intercepting the target field’s value.

Arguments

• value - A reference to a value that implements serde::Serialize.

Returns

• Ok(FieldScalarValue) if the field at the specified path is found and is a supported scalar type.
• Err(EvaluateError) if the path is invalid, an intermediate field is not a struct, the final field is not found or has an unsupported type, or a serialization error occurs.

Trait Implementations

impl Clone for NestedFieldExtractor

fn clone(&self) -> NestedFieldExtractor

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NestedFieldExtractor

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

Formats the value using the given formatter.