Enum MetadataError 

pub enum MetadataError {
    MissingKey(String),
    TypeMismatch {
        key: String,
        expected: DataType,
        actual: DataType,
        message: String,
    },
    MissingRequiredField {
        key: String,
        expected: DataType,
    },
    UnknownField {
        key: String,
    },
    UnknownFilterField {
        key: String,
    },
    InvalidFilterOperator {
        key: String,
        operator: &'static str,
        data_type: DataType,
        message: String,
    },
    InvalidFilterExpression {
        message: String,
    },
}

Errors produced by explicit metadata accessors and schema validation.

Variants

MissingKey(String)

The requested key does not exist.

TypeMismatch

A stored value cannot be converted to the requested type.

Fields

key: String

Metadata key being read or validated.

expected: DataType

Expected data type.

actual: DataType

Actual stored data type.

message: String

Human-readable conversion or validation message.

MissingRequiredField

A required schema field is missing from a metadata object.

Fields

key: String

Required metadata key.

expected: DataType

Expected data type for the missing field.

UnknownField

A metadata object contains a key not accepted by the schema.

Fields

key: String

Unknown metadata key.

UnknownFilterField

A filter references a key that is not defined by the schema.

Fields

key: String

Unknown filter key.

InvalidFilterOperator

A filter uses an operator that is not compatible with the field type.

Fields

key: String

Metadata key being filtered.

operator: &'static str

Filter operator name.

data_type: DataType

Field data type defined by the schema.

message: String

Human-readable validation message.

InvalidFilterExpression

A filter expression is structurally invalid.

Fields

message: String

Human-readable validation message.

Trait Implementations

impl Clone for MetadataError

fn clone(&self) -> MetadataError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MetadataError

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

Formats the value using the given formatter.

impl Display for MetadataError

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

Formats the value using the given formatter.

impl Error for MetadataError

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 PartialEq for MetadataError

fn eq(&self, other: &MetadataError) -> 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 Eq for MetadataError

impl StructuralPartialEq for MetadataError