Trait Projection 

pub trait Projection {
    type Output;

    // Required methods
    fn selection_query(&self) -> SelectionQuery;
    fn decode_one(&self, value: Value) -> Result<Self::Output, CoolError>;

    // Provided methods
    fn decode_many(&self, value: Value) -> Result<Vec<Self::Output>, CoolError> { ... }
    fn decode_page(&self, value: Value) -> Result<Page<Self::Output>, CoolError> { ... }
}

Back-compat alias — the trait moved to cratestack-core and was renamed ProjectionDecoder to free up the Projection name for the SQL value type in cratestack-sql.

Required Associated Types

type Output

Required Methods

fn selection_query(&self) -> SelectionQuery

fn decode_one(&self, value: Value) -> Result<Self::Output, CoolError>

Provided Methods

fn decode_many(&self, value: Value) -> Result<Vec<Self::Output>, CoolError>

fn decode_page(&self, value: Value) -> Result<Page<Self::Output>, CoolError>

Implementors

impl ProjectionDecoder for SelectionQuery

type Output = Value