Enum CardinalityRule 

pub enum CardinalityRule {
    OneToOne,
    OneToMany {
        min: u32,
        max: u32,
    },
    ManyToOne {
        min: u32,
        max: u32,
    },
    ManyToMany {
        min_per_source: u32,
        max_per_source: u32,
    },
}

Cardinality rule for relationships.

Variants

OneToOne

One source to one target.

OneToMany

One source to many targets.

Fields

min: u32

Minimum number of targets.

max: u32

Maximum number of targets.

ManyToOne

Many sources to one target.

Fields

min: u32

Minimum number of sources.

max: u32

Maximum number of sources.

ManyToMany

Many sources to many targets.

Fields

min_per_source: u32

Minimum targets per source.

max_per_source: u32

Maximum targets per source.

Implementations

impl CardinalityRule

pub fn one_to_one() -> Self

Creates a OneToOne cardinality.

pub fn one_to_many(min: u32, max: u32) -> Self

Creates a OneToMany cardinality.

pub fn many_to_one(min: u32, max: u32) -> Self

Creates a ManyToOne cardinality.

pub fn many_to_many(min_per_source: u32, max_per_source: u32) -> Self

Creates a ManyToMany cardinality.

pub fn bounds(&self) -> (u32, u32)

Returns the minimum and maximum counts for this cardinality.

pub fn is_multi_target(&self) -> bool

Checks if this cardinality allows multiple targets.

pub fn is_multi_source(&self) -> bool

Checks if this cardinality allows multiple sources.

Trait Implementations

impl Clone for CardinalityRule

fn clone(&self) -> CardinalityRule

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CardinalityRule

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

Formats the value using the given formatter.

impl Default for CardinalityRule

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for CardinalityRule

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for CardinalityRule

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

where __S: Serializer,

Serialize this value into the given Serde serializer.