relay_knowledge/domain/
error.rs

1use std::{error::Error, fmt};
2
3/// Domain-level validation failure.
4#[derive(Debug, Clone, PartialEq, Eq)]
5pub struct DomainError {
6    pub field: &'static str,
7    pub message: String,
8}
9
10impl DomainError {
11    /// Builds a validation error with a stable field name.
12    pub fn invalid(field: &'static str, message: impl Into<String>) -> Self {
13        Self {
14            field,
15            message: message.into(),
16        }
17    }
18}
19
20impl fmt::Display for DomainError {
21    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
22        write!(formatter, "{}: {}", self.field, self.message)
23    }
24}
25
26impl Error for DomainError {}
27
28pub(crate) fn required_text(
29    field: &'static str,
30    value: impl Into<String>,
31) -> Result<String, DomainError> {
32    let text = value.into();
33    let trimmed = text.trim();
34    if trimmed.is_empty() {
35        return Err(DomainError::invalid(field, "must not be empty"));
36    }
37
38    Ok(trimmed.to_owned())
39}
40
41#[cfg(test)]
42mod tests {
43    use super::*;
44
45    #[test]
46    fn displays_field_and_message() {
47        let error = DomainError::invalid("field", "failed");
48
49        assert_eq!(error.to_string(), "field: failed");
50    }
51}
relay_knowledge/domain/error.rs

relay_knowledge/domain/
error.rs
