Trait sql::query_model::attribute::core::Attribute

pub(crate) trait Attribute: Debug + 'static {
    fn attr_id(&self) -> &'static str;
    fn requires(&self) -> Vec<Box<dyn Attribute>>;
    fn derive(&self, model: &mut Model, box_id: BoxId);
}

A trait that defines the logic for deriving an attribute.

Required methods

fn attr_id(&self) -> &'static str

A globally unique identifier for this attribute type.

fn requires(&self) -> Vec<Box<dyn Attribute>>

A vector of attributes that need to be derived before this attribute.

fn derive(&self, model: &mut Model, box_id: BoxId)

A function that derives at a specific BoxId.

Trait Implementations

impl Hash for dyn Attribute

A naive Hash for attributes that delegates to the associated std::any::TypeId.

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl PartialEq<dyn Attribute + 'static> for dyn Attribute

A naive PartialEq implementation for Attribute trait objects that differentiates two attributes based on their std::any::TypeId.

fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl Eq for dyn Attribute

An evidence that the PartialEq implementation for Attribute is an equivalence relation.

Implementors

impl Attribute for PropagatedNulls

impl Attribute for RejectedNulls