Struct RequiredRule 

pub struct RequiredRule {
    pub message: Option<String>,
}

Required validation rule - field must not be empty/null.

Example

use skp_validator_rules::comparison::required::RequiredRule;
use skp_validator_core::{Rule, ValidationContext};

let rule = RequiredRule::new();
let ctx = ValidationContext::default();

assert!(rule.validate("hello", &ctx).is_ok());
assert!(rule.validate("", &ctx).is_err()); // Empty string

Fields

message: Option<String>

Custom error message

Implementations

impl RequiredRule

pub fn new() -> Self

Create a new required rule.

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

Set custom error message.

Trait Implementations

impl Clone for RequiredRule

fn clone(&self) -> RequiredRule

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RequiredRule

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

Formats the value using the given formatter.

impl Default for RequiredRule

fn default() -> RequiredRule

Returns the “default value” for a type.

impl<T> Rule<Option<T>> for RequiredRule

fn validate( &self, value: &Option<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).

impl Rule<String> for RequiredRule

fn validate( &self, value: &String, 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).

impl<T> Rule<Vec<T>> for RequiredRule

fn validate( &self, value: &Vec<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).

impl Rule<str> for RequiredRule

fn validate( &self, value: &str, _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).