Trait ValidationRule

Source

pub trait ValidationRule<T: ?Sized>:
    Debug
    + Send
    + Sync {
    // Required methods
    fn validate(&self, value: &T) -> Result<(), RuleError>;
    fn rule_name(&self) -> &'static str;

    // Provided method
    fn default_message(&self) -> String { ... }
}

Expand description

Trait for individual validation rules.

Each rule validates a single value and returns a RuleError on failure. Rules should be serializable for configuration and pretty-printing.

§Example

use rustapi_validate::v2::prelude::*;

struct PositiveRule;

impl ValidationRule<i32> for PositiveRule {
    fn validate(&self, value: &i32) -> Result<(), RuleError> {
        if *value > 0 {
            Ok(())
        } else {
            Err(RuleError::new("positive", "Value must be positive"))
        }
    }
     
    fn rule_name(&self) -> &'static str {
        "positive"
    }
}