Struct LengthValidator 

pub struct LengthValidator { /* private fields */ }

Validates string-like length constraints for an attribute.

Implementations

impl LengthValidator

pub fn new() -> Self

Creates a new length validator with no constraints.

pub fn allow_nil(self) -> Self

Skips validation when the attribute value is missing or null.

pub fn allow_blank(self) -> Self

Skips validation when the attribute value is blank.

pub fn on(self, contexts: Vec<ValidationContext>) -> Self

Restricts the validator to the provided contexts.

pub fn strict(self) -> Self

Raises immediately instead of collecting produced errors.

pub fn if_cond<F>(self, cond: F) -> Self

where F: Fn(&Value) -> bool + Send + Sync + 'static,

Runs the validator only when the predicate returns true.

pub fn unless_cond<F>(self, cond: F) -> Self

where F: Fn(&Value) -> bool + Send + Sync + 'static,

Skips the validator when the predicate returns true.

pub fn minimum(self, minimum: usize) -> Self

Requires the value length to be at least minimum.

pub fn maximum(self, maximum: usize) -> Self

Requires the value length to be at most maximum.

pub fn is(self, exact: usize) -> Self

Requires the value length to equal exact.

pub fn in_range(self, range: RangeInclusive<usize>) -> Self

Requires the value length to fall within the inclusive range.

pub fn message(self, message: impl Into<String>) -> Self

Overrides the default error message for every length failure.

pub fn too_short_message(self, message: impl Into<String>) -> Self

Overrides the default too-short error message.

pub fn too_long_message(self, message: impl Into<String>) -> Self

Overrides the default too-long error message.

pub fn wrong_length_message(self, message: impl Into<String>) -> Self

Overrides the default wrong-length error message.

Trait Implementations

impl Clone for LengthValidator

fn clone(&self) -> LengthValidator

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LengthValidator

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

Formats the value using the given formatter.

impl Default for LengthValidator

fn default() -> LengthValidator

Returns the “default value” for a type.

impl Validator for LengthValidator

fn validate(&self, attribute: &str, value: Option<&Value>, errors: &mut Errors)

Validates a single attribute value, adding any produced errors.

fn name(&self) -> &str

Returns the validator’s display name.

fn options(&self) -> &ValidatorOptions

Returns the common runtime options for this validator.

fn validate_with_attrs( &self, attribute: &str, value: Option<&Value>, _attrs: &dyn Fn(&str) -> Option<Value>, errors: &mut Errors, )

Validates a single attribute with access to sibling attributes when needed.