Struct PromptVariableMappingInput 

pub struct PromptVariableMappingInput {
    pub variable: String,
    pub source: PromptVariableMappingSource,
    pub json_path: Option<Option<String>>,
}

PromptVariableMappingInput : Connects one prompt variable to data from an observation or experiment. Manual mappings are used for llm_as_judge evaluators. code evaluators use a fixed runtime mapping managed by Langfuse. How to build a valid mapping list: 1. Create the evaluator or fetch it with GET /evaluators/{id}. 2. Read the evaluator variables array. 3. Add exactly one mapping object for each variable in that array. 4. Use the variable name exactly as returned, without braces such as {{ or }}. 5. Choose the source field that should populate the variable. jsonPath is optional. Use it only when the selected source is a JSON object and you want to extract one nested field before inserting it into the evaluator prompt. Invalid, missing, or duplicate mappings return a validation error. Malformed JSONPath expressions are also rejected.

Fields

variable: String

Prompt variable name without braces. Example: for the prompt Judge {{input}} against {{output}}, use input and output.

source: PromptVariableMappingSource

json_path: Option<Option<String>>

Optional JSONPath selector applied to the selected source before it is passed to the evaluator prompt. Requirements: - Must start with $ - Must be a syntactically valid JSONPath expression - Most useful with source=metadata

Implementations

impl PromptVariableMappingInput

pub fn builder() -> PromptVariableMappingInputBuilder

Create an instance of PromptVariableMappingInput using the builder syntax

impl PromptVariableMappingInput

pub fn new( variable: String, source: PromptVariableMappingSource, ) -> PromptVariableMappingInput

Connects one prompt variable to data from an observation or experiment. Manual mappings are used for llm_as_judge evaluators. code evaluators use a fixed runtime mapping managed by Langfuse. How to build a valid mapping list: 1. Create the evaluator or fetch it with GET /evaluators/{id}. 2. Read the evaluator variables array. 3. Add exactly one mapping object for each variable in that array. 4. Use the variable name exactly as returned, without braces such as {{ or }}. 5. Choose the source field that should populate the variable. jsonPath is optional. Use it only when the selected source is a JSON object and you want to extract one nested field before inserting it into the evaluator prompt. Invalid, missing, or duplicate mappings return a validation error. Malformed JSONPath expressions are also rejected.

Trait Implementations

impl Clone for PromptVariableMappingInput

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 PromptVariableMappingInput

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

Formats the value using the given formatter.

impl Default for PromptVariableMappingInput

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for PromptVariableMappingInput

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for PromptVariableMappingInput

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for PromptVariableMappingInput

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for PromptVariableMappingInput