Struct Has 

pub struct Has {
    pub target: ModelId,
    pub expr_ty: Type,
    pub cardinality: Cardinality,
    pub pair_id: FieldId,
}

The inverse side of a relationship.

A Has field on model A reaches an associated model B through a paired BelongsTo field on B that holds the foreign key. Its cardinality records whether the field represents “A has many Bs” or “A has one B”.

Fields

target: ModelId

The ModelId of the associated (target) model.

expr_ty: Type

The expression type this field evaluates to from the application’s perspective.

cardinality: Cardinality

Whether this relation is one-to-many or one-to-one.

pair_id: FieldId

The paired BelongsTo field on the target model.

Implementations

impl Has

pub fn is_many(&self) -> bool

Returns true when this is a one-to-many relation.

pub fn is_one(&self) -> bool

Returns true when this is a one-to-one relation.

pub fn singular(&self) -> Option<&Name>

Returns the singular item name for a one-to-many relation.

pub fn target<'a>(&self, schema: &'a Schema) -> &'a Model

Resolves the target Model from the given schema.

pub fn pair<'a>(&self, schema: &'a Schema) -> &'a BelongsTo

Resolves the paired BelongsTo relation on the target model.

Panics

Panics if the paired field is not a BelongsTo variant.

Trait Implementations

impl Clone for Has

fn clone(&self) -> Has

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Has

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

Formats the value using the given formatter.