How Provide Dynamic Message In Custom Loopback Validation?

Here is from documentation: User.validate('name', customValidator, {message: 'Bad name'}); function customValidator(err) { if (this.name === 'bad') err(); }); var user = new Us

Solution 1:

Suddenly there is a addError method with signature errors.add(attr, message, code), so:

User.validate('name', customValidator);
function customValidator(err) {
    if (this.name === 'bad') {
        this.errors.add('name', `Name is bad`, 'name.bad')
        err();
    }
    if (this.name === 'very bad') {
        this.errors.add('name', `Name is very bad`, 'name.very.bad')
        err();
    }
});

This works, but keep in mind that you will have +1 custom code and message, see error.details.codes.name and error.details.messages.name paths from rough json below:

{
  "error": {
    "statusCode": 422,
    "name": "ValidationError",
    "message": "The `Entity` instance is not valid. Details: `name` Name is very bad (value: very bad).",
    "details": {
      "context": "Entity",
      "codes": {
        "name": [
          "name.very.bad",
          "custom"
        ],
        },
      "messages": {
        "name": [
          "Name is very bad",
          "is invalid"
        ]
      }
    },
    "stack": "..."
  }
}