Struct DependencyRule 

pub struct DependencyRule<T>
where
    T: ?Sized,
{
    pub field_name: String,
    pub depends_on_field: Option<String>,
    pub condition: Option<DependencyCondition>,
    pub validator: Option<DependencyValidator<T>>,
    pub required_when_met: bool,
    pub message: Option<String>,
}

Field dependency validation rule - validates based on other field values.

Example

use skp_validator_rules::custom::dependency::{DependencyRule, DependencyCondition};
use skp_validator_core::{Rule, ValidationContext};

// Shipping address is required when shipping_method is "delivery"
let rule = DependencyRule::<str>::new("shipping_address")
    .depends_on("shipping_method", DependencyCondition::Equals("delivery".to_string()))
    .then_required();

Fields

field_name: String

The field being validated

depends_on_field: Option<String>

The field we depend on

condition: Option<DependencyCondition>

The condition on the dependency field

validator: Option<DependencyValidator<T>>

Validation to apply when condition is met

required_when_met: bool

Whether field is required when condition is met

message: Option<String>

Custom error message

Implementations

impl<T: ?Sized> DependencyRule<T>

pub fn new(field_name: impl Into<String>) -> Self

Create a new dependency rule.

pub fn depends_on( self, field: impl Into<String>, condition: DependencyCondition, ) -> Self

Set the field this depends on and condition.

pub fn then_required(self) -> Self

Make field required when condition is met.

pub fn then_validate<F>(self, validator: F) -> Self

where F: Fn(&T, &ValidationContext) -> bool + Send + Sync + 'static,

Set custom validation when condition is met.

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

Set custom error message.

Trait Implementations

impl<T: ?Sized> Debug for DependencyRule<T>

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

Formats the value using the given formatter.

impl Rule<String> for DependencyRule<String>

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 Rule<str> for DependencyRule<str>

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).