Enum ValidationError 

pub enum ValidationError {
    NoQuestions,
    MissingInstructions(String),
    ChoiceCriteriaEmpty(String),
    ScoreCriteriaTooFew(String),
    ScoreLevelEmpty {
        id: String,
        index: usize,
    },
    NoulTrueEmpty(String),
    NoulFalseEmpty(String),
    ChoiceNotInCriteria(String),
    ProbabilityKeysMismatch(String),
    ProbabilitiesDontSum {
        id: String,
        sum: f64,
    },
    ProbabilityOutOfRange {
        id: String,
        value: f64,
    },
    ConfidenceOutOfRange {
        id: String,
        value: f64,
    },
    NoulOutOfRange {
        id: String,
        value: f64,
    },
    ScoreLegendMismatch(String),
    ScoreIndexNotNumeric {
        id: String,
        key: String,
    },
    ScoreOutOfRange {
        id: String,
        max: f64,
        value: f64,
    },
    ScoreExpectationMismatch {
        id: String,
        expected: f64,
        value: f64,
    },
    TooManyQuestions {
        count: usize,
        max: usize,
    },
    TooManyCriteriaOptions {
        id: String,
        count: usize,
        max: usize,
    },
    MissingAnswer(String),
    UnexpectedAnswer(String),
    AnswerTypeMismatch {
        id: String,
        expected: &'static str,
        actual: &'static str,
    },
}

Validation errors representing violations of the Jev protocol specification.

When encountered in the API layer, these errors are translated directly into HTTP 422 Unprocessable Entity responses (invalid_body code) with detailed diagnostic messages.

Variants

NoQuestions

Emitted when a request contains an empty questions map. The Jev specification requires at least one question per evaluation request.

MissingInstructions(String)

Emitted when a question does not provide non-empty instructions. Instructions must be a non-empty string, object, or array.

ChoiceCriteriaEmpty(String)

Emitted when a choice question provides an empty criteria map. A choice question must have at least one selectable option.

ScoreCriteriaTooFew(String)

Emitted when a score question provides fewer than 2 rubric levels in criteria. An ordinal rating rubric requires at least 2 distinct levels.

ScoreLevelEmpty

Emitted when any rubric level description in a score question is empty.

Fields

id: String

Identifier of the question with the empty level description.

index: usize

Zero-based index of the invalid empty level.

NoulTrueEmpty(String)

Emitted when a noul question’s criteria specifies an empty true description.

NoulFalseEmpty(String)

Emitted when a noul question’s criteria specifies an empty false description.

ChoiceNotInCriteria(String)

Emitted when a choice answer’s selected choice string does not match any key in the question’s criteria.

ProbabilityKeysMismatch(String)

Emitted when the keys in a choice answer’s probabilities map do not exactly match the question’s criteria keys.

ProbabilitiesDontSum

Emitted when probabilities in an answer distribution do not sum to 1.0 (within epsilon tolerance).

Fields

id: String

Question identifier.

sum: f64

Calculated sum of the probability distribution.

ProbabilityOutOfRange

Emitted when any probability value in an answer distribution is outside the valid range [0.0, 1.0] or NaN.

Fields

id: String

Question identifier.

value: f64

Invalid probability value.

ConfidenceOutOfRange

Emitted when an answer’s confidence score is outside [0.0, 1.0] or NaN.

Fields

id: String

Question identifier.

value: f64

Invalid confidence value.

NoulOutOfRange

Emitted when a noul answer value is outside [0.0, 1.0] or NaN.

Fields

id: String

Question identifier.

value: f64

Invalid noul probability value.

ScoreLegendMismatch(String)

Emitted when a score answer’s legend disagrees with its probability keys or the requested rubric.

ScoreIndexNotNumeric

Emitted when a score answer’s legend or probability key cannot be parsed as a numeric index string (e.g. “0”, “1”).

Fields

id: String

Question identifier.

key: String

Non-numeric key string encountered.

ScoreOutOfRange

Emitted when a score answer’s score is outside [0.0, max_level], NaN, or infinite.

Fields

id: String

Question identifier.

max: f64

Maximum allowed score index.

value: f64

Invalid score value.

ScoreExpectationMismatch

Emitted when a score disagrees with its probability-weighted rubric levels.

Fields

id: String

Question identifier.

expected: f64

Probability-weighted mean of the returned level indices.

value: f64

Inconsistent returned score.

TooManyQuestions

Emitted when a request contains more questions than the maximum allowed limit.

Fields

count: usize

Number of questions in the request.

max: usize

Maximum allowed questions.

TooManyCriteriaOptions

Emitted when a question’s criteria options exceed the maximum allowed limit.

Fields

id: String

Question identifier.

count: usize

Number of criteria options.

max: usize

Maximum allowed criteria options.

MissingAnswer(String)

Emitted when a response lacks an answer for a question id the caller supplied.

UnexpectedAnswer(String)

Emitted when a response contains an answer for a question id that was not requested.

AnswerTypeMismatch

Emitted when an answer uses a different primitive than its question.

Fields

id: String

Question identifier.

expected: &'static str

Requested primitive.

actual: &'static str

Returned primitive.

Trait Implementations

impl Debug for ValidationError

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

Formats the value using the given formatter.

impl Display for ValidationError

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

Formats the value using the given formatter.

impl Error for ValidationError

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.