Struct Fact 

pub struct Fact {
    pub name: String,
    pub value: FactValue,
}

A named value rules can refer to, e.g. Ride in Ride.Distance > 5000.

Fields

name: String

The name rules use for this fact.

value: FactValue

The fact’s value.

Implementations

impl Fact

pub fn new(name: String, value: FactValue) -> Self

A fact with the given name and value.

pub fn get_field(&self, field_name: &str) -> Option<&FactValue>

A field of an object fact.

pub fn set_field( &mut self, field_name: String, value: FactValue, ) -> Result<(), String>

Sets a field of an object fact. Fails if the fact isn’t an object.

pub fn deserialize<T: DeserializeOwned>(&self) -> Result<T, String>

Converts this fact’s value back into a deserializable type, e.g. the struct it was created from with Fact::from_serialize.

impl Fact

pub fn from_object(name: String, obj: HashMap<String, FactValue>) -> Self

An object fact with the given fields.

pub fn from_serialize<T: Serialize + ?Sized>( name: &str, value: &T, ) -> Result<Self, String>

Creates a fact from any serializable value, typically a struct.

pub fn string_fact(name: String, value: String) -> Self

A string fact.

pub fn integer_fact(name: String, value: i64) -> Self

An integer fact.

pub fn number_fact(name: String, value: f64) -> Self

A float fact.

pub fn boolean_fact(name: String, value: bool) -> Self

A boolean fact.

Trait Implementations

impl Clone for Fact

fn clone(&self) -> Fact

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Fact

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Fact

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Fact

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

where __S: Serializer,

Serialize this value into the given Serde serializer.