Enum JoinKind 

pub enum JoinKind {
    BelongsTo {
        column: ColumnName,
    },
    HasOne {
        foreign_key: ColumnName,
    },
    HasMany {
        foreign_key: ColumnName,
    },
    ManyToMany {
        through: Through,
    },
}

The relationship a join expresses. The verb carries both the cardinality and — the part that matters — which table holds the key:

• BelongsTo: this row points at the related row (column is on the parent table) → a single object.
• HasOne / HasMany: the related rows point back at this one (foreign_key is on the related table) → a single object / a nested array.
• ManyToMany: both sides are keyed through a junction table → a nested array.

Variants

BelongsTo

Fields

column: ColumnName

HasOne

Fields

foreign_key: ColumnName

HasMany

Fields

foreign_key: ColumnName

ManyToMany

Fields

through: Through

Implementations

impl JoinKind

pub fn is_to_many(&self) -> bool

Whether this join folds in many rows (a nested array) rather than one (an object).

Trait Implementations

impl Clone for JoinKind

fn clone(&self) -> JoinKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for JoinKind

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for JoinKind

fn deserialize<__D>( __deserializer: __D, ) -> Result<JoinKind, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for JoinKind

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

where __H: Hasher,

Feeds this value into the given Hasher.

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

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Serialize for JoinKind

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

where __S: Serializer,

Serialize this value into the given Serde serializer.