Struct CustomValidator 

pub struct CustomValidator {
    pub validate_fn: Box<dyn Fn(&str, Option<&Value>, &mut Errors) + Send + Sync>,
    /* private fields */
}

Validates an attribute through a caller-provided function.

Fields

validate_fn: Box<dyn Fn(&str, Option<&Value>, &mut Errors) + Send + Sync>

Function invoked during validation.

Implementations

impl CustomValidator

pub fn new<F>(validate_fn: F) -> Self

where F: Fn(&str, Option<&Value>, &mut Errors) + Send + Sync + 'static,

Creates a new custom validator from validate_fn.

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.

Trait Implementations

impl Debug for CustomValidator

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

Formats the value using the given formatter.

impl Validator for CustomValidator

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.