Struct CustomFnRule 

pub struct CustomFnRule<T: ?Sized, F>
where
    F: Fn(&T, &ValidationContext) -> bool + Send + Sync,
{
    pub rule_name: String,
    pub validator: Arc<F>,
    pub message: Option<String>,
    /* private fields */
}

Custom function validation rule - validates using a user-provided function.

Example

use skp_validator_rules::custom::custom_fn::CustomFnRule;
use skp_validator_core::{Rule, ValidationContext};

let rule = CustomFnRule::new("is_even", |value: &i32, _ctx| {
    value % 2 == 0
}).message("Value must be even");

let ctx = ValidationContext::default();
assert!(rule.validate(&4, &ctx).is_ok());
assert!(rule.validate(&3, &ctx).is_err());

Fields

rule_name: String

Rule name for error reporting

validator: Arc<F>

The validation function

message: Option<String>

Custom error message

Implementations

impl<T: ?Sized, F> CustomFnRule<T, F>

where F: Fn(&T, &ValidationContext) -> bool + Send + Sync,

pub fn new(name: impl Into<String>, validator: F) -> Self

Create a new custom function rule.

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

Set custom error message.

Trait Implementations

impl<T: ?Sized, F> Clone for CustomFnRule<T, F>

where F: Fn(&T, &ValidationContext) -> bool + Send + Sync,

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: ?Sized, F> Debug for CustomFnRule<T, F>

where F: Fn(&T, &ValidationContext) -> bool + Send + Sync,

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

Formats the value using the given formatter.

impl<T: ?Sized, F> Rule<T> for CustomFnRule<T, F>

where F: Fn(&T, &ValidationContext) -> bool + Send + Sync,

fn validate(&self, value: &T, ctx: &ValidationContext) -> ValidationResult<()>

Validate the value.

fn name(&self) -> &'static str

Get the rule name for error reporting.

fn default_message(&self) -> String

Get the default error message.

fn validate_at( &self, value: &T, path: &FieldPath, ctx: &ValidationContext, ) -> Result<(), ValidationErrors>

Validate the value with a field path for error reporting.

fn error_code(&self) -> String

Get the error code.

fn is_transform(&self) -> bool

Check if this rule is a transformation (not validation).