Enum mentat_db::errors::SchemaConstraintViolation

pub enum SchemaConstraintViolation {
    ConflictingUpserts {
        conflicting_upserts: BTreeMap<TempId, BTreeSet<KnownEntid>>,
    },
    TypeDisagreements {
        conflicting_datoms: BTreeMap<(Entid, Entid, TypedValue), ValueType>,
    },
    CardinalityConflicts {
        conflicts: Vec<CardinalityConflict>,
    },
}

Variants

ConflictingUpserts

A transaction tried to assert datoms where one tempid upserts to two (or more) distinct entids.

Fields of ConflictingUpserts

conflicting_upserts: BTreeMap<TempId, BTreeSet<KnownEntid>>

A map from tempid to the entids it would upsert to. In the future, we might even be able to attribute the upserts to particular (reduced) datoms, i.e., to particular [e a v] triples that caused the constraint violation. Attributing constraint violations to input data is more difficult to the multiple rewriting passes the input undergoes.

TypeDisagreements

A transaction tried to assert a datom or datoms with the wrong value v type(s).

Fields of TypeDisagreements

conflicting_datoms: BTreeMap<(Entid, Entid, TypedValue), ValueType>

The key ([e a v]) has an invalid value v: it is not of the expected value type.

CardinalityConflicts

A transaction tried to assert datoms that don't observe the schema's cardinality constraints.

Fields of CardinalityConflicts

conflicts: Vec<CardinalityConflict>

Trait Implementations

impl Clone for SchemaConstraintViolation

fn clone(&self) -> SchemaConstraintViolation

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for SchemaConstraintViolation

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Eq for SchemaConstraintViolation

impl PartialEq for SchemaConstraintViolation

fn eq(&self, __arg_0: &SchemaConstraintViolation) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &SchemaConstraintViolation) -> bool

This method tests for !=.

impl Fail for SchemaConstraintViolation

fn cause(&self) -> Option<&Fail>

Returns a reference to the underlying cause of this failure, if it is an error that wraps other errors.

fn backtrace(&self) -> Option<&Backtrace>

Returns a reference to the Backtrace carried by this failure, if it carries one.

fn context<D>(self, context: D) -> Context<D> where     D: Display + Send + Sync + 'static,

Provides context for this failure.

fn compat(self) -> Compat<Self>

Wraps this failure in a compatibility wrapper that implements std::error::Error.

Important traits for Causes<'f>

impl<'f> Iterator for Causes<'f> type Item = &'f (Fail + 'static);

fn causes(&self) -> Causes

Returns a iterator over the causes of this Fail with itself as the first item and the root_cause as the final item.

fn root_cause(&self) -> &(Fail + 'static)

Returns the "root cause" of this Fail - the last value in the cause chain which does not return an underlying cause.

impl Display for SchemaConstraintViolation

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

Formats the value using the given formatter.