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Allow custom validator to return an error string #8

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Allow custom validator to return an error string #8

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8 changes: 6 additions & 2 deletions lib/helper.js
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Original file line number Diff line number Diff line change
Expand Up @@ -20,8 +20,12 @@ module.exports = function(options, key, validations, param) {
else if (_.isFunction(validations)) {
try {
const test = validations(param);
if (!_.isBoolean(test)) {
return { error: 'The validation response must be boolean.' };
// If the custom test returns a string, use that as the error message
if (_.isString(test)) {
return { error: test };
}
else if (!_.isBoolean(test)) {
return { error: 'The validation response must be boolean or an error message.' };
}
return test ? { value: param } : { error: 'The validation failed' };
} catch (e) {
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