Enum OnDelete 

pub enum OnDelete {
    Restrict,
    Cascade,
    SetNull,
}

Referential-integrity action triggered when a referenced row is deleted. 0.9.0 introduces this on AddRelation.

Variants

Restrict

Default. Refuse to delete a parent row while children exist.

Cascade

Delete every child row whose FK points at the parent being deleted. Dangerous — requires explicit opt-in.

SetNull

Null out the FK on every child row. Valid only when the FK column is nullable.

Implementations

impl OnDelete

pub fn sql(self) -> &'static str

SQLite clause fragment, e.g. ON DELETE RESTRICT. Case-folded upper for readability in generated migrations.

pub fn as_str(self) -> &'static str

snake_case serialised form, mirrors the serde rename.

Trait Implementations

impl Clone for OnDelete

fn clone(&self) -> OnDelete

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OnDelete

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

Formats the value using the given formatter.

impl Default for OnDelete

fn default() -> OnDelete

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for OnDelete

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for OnDelete

fn eq(&self, other: &OnDelete) -> 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 Serialize for OnDelete

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for OnDelete

impl Eq for OnDelete

impl StructuralPartialEq for OnDelete