Struct ValidationError 

pub struct ValidationError {
    pub type_name: &'static str,
    pub reason: String,
}

A validation failure for a domain value, naming the type that rejected the value and why.

type_name is a plain string, not tied to Self by the compiler: it is whatever the caller of ValidationError::new passes in. Derive-macro generated code always passes the exact type name it was expanded for, so it is guaranteed accurate there. A hand-written impl (as in this crate’s own test fixtures) must keep the type_name argument in sync with the type by hand - copy-pasting an impl from one type to another is the most likely way for it to drift.

With the serde feature enabled, this derives Serialize only, not Deserialize: type_name is &'static str, and there is no sound way to produce a &'static str from arbitrary deserialized input without leaking memory. Serializing is the common need anyway (e.g. reporting a validation failure in an API error body); reconstructing one from JSON is not.

Examples

use ddd_toolkit_core::domain::ValidationError;

let error = ValidationError::new("Email", "missing '@'");

assert_eq!(error.type_name, "Email");
assert_eq!(error.reason, "missing '@'");
assert_eq!(error.to_string(), "invalid Email: missing '@'");

Fields

type_name: &'static str

The name of the type that rejected the value.

reason: String

A human-readable explanation of why the value was rejected.

Implementations

impl ValidationError

pub fn new( type_name: &'static str, reason: impl Into<String>, ) -> ValidationError

Creates a new ValidationError for the type named type_name.

Trait Implementations

impl Clone for ValidationError

fn clone(&self) -> ValidationError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ValidationError

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

Formats the value using the given formatter.

impl Display for ValidationError

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

Formats the value using the given formatter.

impl Eq for ValidationError

impl Error for ValidationError

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

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

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

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

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

Provides type-based access to context intended for error reports.

impl PartialEq for ValidationError

fn eq(&self, other: &ValidationError) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for ValidationError

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ValidationError