Enum QuerySingleError 

pub enum QuerySingleError {
    NoEntities(DebugName),
    MultipleEntities(DebugName),
}

An error that occurs when evaluating a Query or QueryState as a single expected result via single or single_mut.

Variants

NoEntities(DebugName)

No entity fits the query.

MultipleEntities(DebugName)

Multiple entities fit the query.

Trait Implementations

impl Debug for QuerySingleError

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

Formats the value using the given formatter.

impl Display for QuerySingleError

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

Formats the value using the given formatter.

impl Error for QuerySingleError

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.