Struct FieldMapping 

pub struct FieldMapping {
    pub source: String,
    pub output: String,
    pub nested_typename: Option<String>,
    pub nested_fields: Option<Vec<FieldMapping>>,
}

Field mapping for projection with alias support.

Fields

source: String

JSONB key name (source).

output: String

Output key name (alias if different from source).

nested_typename: Option<String>

For nested object fields, the typename to add. This enables __typename to be added recursively to nested objects.

nested_fields: Option<Vec<FieldMapping>>

Nested field mappings (for related objects).

Implementations

impl FieldMapping

pub fn simple(name: impl Into<String>) -> Self

Create a simple field mapping (no alias).

pub fn aliased(source: impl Into<String>, alias: impl Into<String>) -> Self

Create a field mapping with an alias.

pub fn nested_object( name: impl Into<String>, typename: impl Into<String>, fields: Vec<FieldMapping>, ) -> Self

Create a field mapping for a nested object with its own typename.

Example

// For a Post with nested author (User type)
FieldMapping::nested_object("author", "User", vec![
    FieldMapping::simple("id"),
    FieldMapping::simple("name"),
])

pub fn nested_object_aliased( source: impl Into<String>, alias: impl Into<String>, typename: impl Into<String>, fields: Vec<FieldMapping>, ) -> Self

Create an aliased nested object field.

pub fn with_nested_typename(self, typename: impl Into<String>) -> Self

Set the typename for a nested object field.

pub fn with_nested_fields(self, fields: Vec<FieldMapping>) -> Self

Set nested field mappings.

Trait Implementations

impl Clone for FieldMapping

fn clone(&self) -> FieldMapping

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FieldMapping

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

Formats the value using the given formatter.