@elsikora/nestjs-crud-automator/dist/esm/utility/api/route/validation-flatten-errors.utility.js

A library for automating the creation of CRUD operations in NestJS.

/**
 * Flattens class-validator errors into the same message array shape used by Nest ValidationPipe.
 * @param {Array<ValidationError>} errors - Validation errors to flatten.
 * @param {string} [parentProperty] - Parent property path.
 * @returns {Array<string>} Flattened validation messages.
 */
function ApiRouteValidationFlattenErrors(errors, parentProperty) {
    const messages = [];
    for (const error of errors) {
        const propertyPath = parentProperty ? `${parentProperty}.${error.property}` : error.property;
        if (error.constraints) {
            messages.push(...Object.values(error.constraints).map((message) => {
                return parentProperty ? message.replace(`${error.property} `, `${propertyPath} `) : message;
            }));
        }
        if (error.children && error.children.length > 0) {
            messages.push(...ApiRouteValidationFlattenErrors(error.children, propertyPath));
        }
    }
    return messages;
}

export { ApiRouteValidationFlattenErrors };
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