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ConstraintKind

nodedb_crdt::constraint

Enum ConstraintKind 

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pub enum ConstraintKind {
    Unique,
    ForeignKey {
        ref_collection: String,
        ref_key: String,
    },
    BiTemporalFK {
        ref_collection: String,
        ref_key: String,
    },
    NotNull,
    Check {
        description: String,
    },
}
Expand description

The kind of SQL constraint to enforce.

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Unique

No two rows may have the same value for this key. Analogous to SQL UNIQUE(column).

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ForeignKey

The value must reference an existing key in another collection. Analogous to SQL FOREIGN KEY(column) REFERENCES other(key).

Fields

§ref_collection: String

The referenced collection name.

§ref_key: String

The referenced key field.

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BiTemporalFK

Bitemporal foreign key. Write-side semantics match ForeignKey (referent must exist live), but on referent delete the referrer row/edge is closed by appending a new version with valid_until_ms = now rather than being cascade-deleted. This preserves the historical truth that the relationship existed.

Fields

§ref_collection: String
§ref_key: String
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NotNull

The value must not be null/empty. Analogous to SQL NOT NULL.

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Check

Custom predicate — evaluated as a boolean expression on the row. Analogous to SQL CHECK(expression).

Fields

§description: String

Human-readable description of the check.

Trait Implementations§

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impl Clone for ConstraintKind

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fn clone(&self) -> ConstraintKind

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for ConstraintKind

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

Formats the value using the given formatter. Read more
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impl<'de> Deserialize<'de> for ConstraintKind

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

Deserialize this value from the given Serde deserializer. Read more
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impl PartialEq for ConstraintKind

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

Tests for self and other values to be equal, and is used by ==.
1.0.0 (const: unstable) · Source§

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

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

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

Serialize this value into the given Serde serializer. Read more
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impl Eq for ConstraintKind

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impl StructuralPartialEq for ConstraintKind

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fn equivalent(&self, key: &K) -> bool

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