Struct EnumHandler 

pub struct EnumHandler;

Implementations

impl EnumHandler

pub fn validate_and_canonicalize( value: &str, allowed_values: &[String], field_name: &str, ) -> Result<String>

Validate and canonicalize an enumeration value

This method performs case-insensitive validation against the allowed values list and canonicalizes the result to lowercase for consistency.

Validation Process

• Convert input to lowercase for comparison
• Check if lowercase value exists in allowed values (case-insensitive)
• Return the lowercase canonical form if valid
• Provide detailed error with all allowed values if invalid

Arguments

• value - The input value to validate
• allowed_values - List of allowed values (case-insensitive matching)
• field_name - Name of the field being validated (for error messages)

Returns

• Ok(String) - The value in canonical lowercase form
• Err(anyhow::Error) - Value not in allowed list with helpful error