Struct form_validation::ValidationError

pub struct ValidationError<Key> {
    pub key: Key,
    // some fields omitted
}

An error associated with a form field.

Fields

key: Key

The key for the field that this validation error is associated with.

Implementations

impl<Key> ValidationError<Key>

pub fn new(key: Key) -> Self

Create a new ValidationError with a generic message.

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

Factory method to set the message for this error.

pub fn with_message<F: Fn(&Key) -> String + 'static>(self, message: F) -> Self

Factory method to set the message for this error from a function that returns a String.

Example

use form_validation::ValidationError;

let value = -10;
let error = ValidationError::new("field1").with_message(move |key| {
    format!(
        "The value of {} ({}) cannot be less than 0",
         key, value)
});

assert_eq!("The value of field1 (-10) cannot be less than 0", error.to_string());

Trait Implementations

impl<Key> Clone for ValidationError<Key> where
    Key: Clone, 

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<Key> Debug for ValidationError<Key> where
    Key: Debug, 

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

Formats the value using the given formatter.

impl<Key> Display for ValidationError<Key>

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

Formats the value using the given formatter.

impl<Key> Error for ValidationError<Key> where
    Key: Debug, 

fn source(&self) -> Option<&(dyn Error + 'static)>

The lower-level source of this error, if any.

fn backtrace(&self) -> Option<&Backtrace>

🔬 This is a nightly-only experimental API. (backtrace)

Returns a stack backtrace, if available, of where this error occurred.

fn description(&self) -> &str

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

if let Err(e) = "xc".parse::<u32>() { // Print e itself, no need for description(). eprintln!("Error: {}", e); }

fn cause(&self) -> Option<&dyn Error>

👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting