Struct RoleType 

pub struct RoleType {
    pub label: String,
}

Roles are special internal types used by relations. We can not create an instance of a role in a database. But we can set an instance of another type (role player) to play a role in a particular instance of a relation type.

Roles allow a schema to enforce logical constraints on types of role players.

Fields

label: String

Implementations

impl RoleType

pub fn label(&self) -> &str

Retrieves the unique label of the RoleType.

Examples

role_type.label()

Trait Implementations

impl Clone for RoleType

fn clone(&self) -> RoleType

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RoleType

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

Formats the value using the given formatter.

impl Display for RoleType

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

Formats the value using the given formatter.

impl PartialEq for RoleType

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for RoleType

impl StructuralPartialEq for RoleType