Enum TransformOperation 

pub enum TransformOperation {
    Extract {
        source_path: String,
        target_field: String,
        optional: bool,
        default: Option<Value>,
    },
    Rename {
        from: String,
        to: String,
    },
    AddConstant {
        field: String,
        value: Value,
    },
    RemoveFields {
        fields: Vec<String>,
    },
    FilterFields {
        fields: Vec<String>,
    },
    StringTransform {
        source_path: String,
        target_field: String,
        transform: StringTransformType,
    },
    MapValue {
        source_path: String,
        target_field: String,
        mappings: HashMap<String, Value>,
        default: Option<Value>,
    },
    Template {
        target_field: String,
        template: String,
    },
    Flatten {
        source_path: String,
        prefix: Option<String>,
        separator: String,
    },
    Wrap {
        wrapper_field: String,
    },
    Custom {
        target_field: String,
        expression: String,
    },
}

A single transformation operation

Variants

Extract

Extract a value from a path and store in output

Fields

source_path: String

JSONPath-like source path (e.g., “$.data.user.id”)

target_field: String

Target field name in output

optional: bool

If true, skip if source not found (otherwise error)

default: Option<Value>

Default value if not found (only used if optional)

Rename

Rename a field

Fields

from: String

Original field path

to: String

New field name

AddConstant

Add a constant value to the output

Fields

field: String

Target field name

value: Value

Constant value to add

RemoveFields

Remove specific fields from the payload

Fields

fields: Vec<String>

Fields to remove

FilterFields

Keep only specific fields (whitelist)

Fields

fields: Vec<String>

Fields to keep

StringTransform

Transform a string value using a pattern

Fields

source_path: String

Source field path

target_field: String

Target field name

transform: StringTransformType

Transform type

MapValue

Map values to other values

Fields

source_path: String

Source field path

target_field: String

Target field name

mappings: HashMap<String, Value>

Value mappings (from -> to)

default: Option<Value>

Default value if no mapping matches

Template

Template string with variable substitution

Fields

target_field: String

Target field name

template: String

Template string with {{path}} placeholders

Flatten

Flatten nested object

Fields

source_path: String

Source path to the nested object

prefix: Option<String>

Prefix to add to flattened keys

separator: String

Separator between prefix and key

Wrap

Wrap payload in a new structure

Fields

wrapper_field: String

Field name to wrap payload under

Custom

Custom transformation using an expression

Fields

target_field: String

Target field name

expression: String

Expression (placeholder for future expression engine)

Trait Implementations

impl Clone for TransformOperation

fn clone(&self) -> TransformOperation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TransformOperation

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for TransformOperation

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for TransformOperation

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

where __S: Serializer,

Serialize this value into the given Serde serializer.