Enum MoveError 

pub enum MoveError {
    UnknownSubjectClass {
        key: String,
    },
    DuplicateRoute {
        class: String,
    },
    TargetIsSource {
        class: String,
    },
    UnknownTable {
        table: String,
        rows: u64,
    },
    UnroutedClass {
        class: String,
        rows: u64,
    },
    StreamMembers {
        notes: Vec<StreamMember>,
    },
    Collisions {
        collisions: Vec<Collision>,
    },
    Sqlite(Error),
}

Why a move refused, or how it failed.

Variants

UnknownSubjectClass

A route key that names no subject class.

Fields

key: String

DuplicateRoute

The same class routed twice. Ambiguous rather than redundant: the two targets may differ, and picking one would be a guess.

Fields

class: String

TargetIsSource

A route whose target is the source. A no-op written as an instruction is more likely a mistake than an intent.

Fields

class: String

UnknownTable

A namespace-bearing table holding rows here that this code has no rule for.

The census finds tables; only a reader of the code can say what a move does with one. So a table arriving in a migration after this was written refuses the move by name, rather than letting the subjects around it move and leaving the new table pointing at a namespace nothing else is in.

Fields

table: String

rows: u64

UnroutedClass

A subject class with rows in the source namespace and no route.

Distinct from a routed class with no rows, which succeeds reporting zero. A host that binds a pack writing nothing needs “routed, nothing there” to be distinguishable from “you forgot this one”.

Fields

class: String

rows: u64

StreamMembers

Notes the stream schema pins to their namespace.

Four triggers make this absolute: an UPDATE of a member note naming namespace aborts, the delete aborts, and both writes to the ledger row abort. So the refusal comes from a read taken before any write, and names the notes, rather than from a trigger’s abort string from somewhere in the middle of the transaction.

Fields

notes: Vec<StreamMember>

Collisions

Rows that would collide in a target namespace.

Fields

collisions: Vec<Collision>

Sqlite(Error)

Trait Implementations

impl Debug for MoveError

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

Formats the value using the given formatter.

impl Display for MoveError

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

Formats the value using the given formatter.

impl Error for MoveError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<Error> for MoveError

fn from(error: Error) -> Self

Converts to this type from the input type.