Trait FromValue 

pub trait FromValue: Sized {
    // Required method
    fn from_value(value: &Value) -> Result<Self>;
}

Converts a grafeo_common::types::Value to a concrete Rust type.

Implemented for common types like i64, f64, String, and bool. Used by QueryResult::scalar() to extract typed values.

Required Methods

fn from_value(value: &Value) -> Result<Self>

Attempts the conversion, returning an error on type mismatch.

Errors

Returns Error::TypeMismatch if the value is not the expected type.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl FromValue for String

fn from_value(value: &Value) -> Result<Self>

impl FromValue for bool

fn from_value(value: &Value) -> Result<Self>

impl FromValue for f64

fn from_value(value: &Value) -> Result<Self>

impl FromValue for i64

fn from_value(value: &Value) -> Result<Self>

Implementors