Struct RuleBuilder 

pub struct RuleBuilder<T> { /* private fields */ }

Builder for creating validation rules in a fluent style

Implementations

impl<T> RuleBuilder<T>

pub fn for_property(property_name: impl Into<String>) -> Self

Create a new rule builder for a property

pub fn rule(self, rule: impl Fn(&T) -> Option<String> + 'static) -> Self

Add a custom rule

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

where T: AsRef<str>,

Validate that the value is not empty (for strings)

Arguments

• message - Optional custom error message. If not provided, uses default message.

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

where T: OptionLike,

Validate that the value is not null/empty (for Option types)

Arguments

• message - Optional custom error message. If not provided, uses default message.

pub fn min_length( self, min: usize, message: Option<impl Into<String> + Clone + 'static>, ) -> Self

where T: AsRef<str>,

Validate minimum length

Arguments

• min - Minimum length required
• message - Optional custom error message. If not provided, uses default message with the min value.

pub fn max_length( self, max: usize, message: Option<impl Into<String> + Clone + 'static>, ) -> Self

where T: AsRef<str>,

Validate maximum length

Arguments

• max - Maximum length allowed
• message - Optional custom error message. If not provided, uses default message with the max value.

pub fn length( self, min: usize, max: usize, min_message: Option<impl Into<String> + Clone + 'static>, max_message: Option<impl Into<String> + Clone + 'static>, ) -> Self

where T: AsRef<str>,

Validate length range

Arguments

• min - Minimum length required
• max - Maximum length allowed
• min_message - Optional custom error message for minimum length violation
• max_message - Optional custom error message for maximum length violation

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

where T: AsRef<str>,

Validate email format

Arguments

• message - Optional custom error message. If not provided, uses default message.

pub fn greater_than( self, min: impl Into<f64> + Copy + 'static, message: Option<impl Into<String> + Clone + 'static>, ) -> Self

where T: Numeric,

Validate that value is greater than a minimum

Arguments

• min - Minimum value (exclusive)
• message - Optional custom error message. If not provided, uses default message with the min value.

pub fn greater_than_or_equal( self, min: impl Into<f64> + Copy + 'static, message: Option<impl Into<String> + Clone + 'static>, ) -> Self

where T: Numeric,

Validate that value is greater than or equal to a minimum

Arguments

• min - Minimum value (inclusive)
• message - Optional custom error message. If not provided, uses default message with the min value.

pub fn less_than( self, max: impl Into<f64> + Copy + 'static, message: Option<impl Into<String> + Clone + 'static>, ) -> Self

where T: Numeric,

Validate that value is less than a maximum

Arguments

• max - Maximum value (exclusive)
• message - Optional custom error message. If not provided, uses default message with the max value.

pub fn less_than_or_equal( self, max: impl Into<f64> + Copy + 'static, message: Option<impl Into<String> + Clone + 'static>, ) -> Self

where T: Numeric,

Validate that value is less than or equal to a maximum

Arguments

• max - Maximum value (inclusive)
• message - Optional custom error message. If not provided, uses default message with the max value.

pub fn inclusive_between( self, min: impl Into<f64> + Copy + 'static, max: impl Into<f64> + Copy + 'static, message: Option<impl Into<String> + Clone + 'static>, ) -> Self

where T: Numeric,

Validate that value is within a range (inclusive)

Arguments

• min - Minimum value (inclusive)
• max - Maximum value (inclusive)
• message - Optional custom error message. If not provided, uses default message with the min and max values.

pub fn must( self, predicate: impl Fn(&T) -> bool + 'static, message: impl Into<String> + Clone + 'static, ) -> Self

Validate with a custom predicate

pub fn build(self) -> impl Fn(&T) -> Vec<ValidationError>

Build the rule and return a function that can be used in a validator