Imagine the following schema:

var schema = {
  name   : Joi.string().required(),
  roles  : Joi.array().items(Joi.string().valid('admin', 'moderator')),
  gender  : Joi.array().items(Joi.string().valid('male', 'female'))
};

Image the following examples:

Example 1

var data = {
    name: 'test',
    roles: ['admin'],
    gender: ['male']
};

• Observation: This example validates to true (what is expected)

Example 2

var data = {
    name: '',
    roles: ['admin'],
    gender: ['male']
};

This example validates to false with the error:

[1] "name" is not allowed to be empty

• Observation: Here I know, that the field with the name "name" throws the error. (what is expected)

Example 3

var data = {
    name: 'test',
    roles: ['waste'],
    gender: ['male']
};

This example validates to false with the error:

[1] "0" must be one of [admin, moderator]

• Observation: Here I know, that the field with the name "0" throws the error.
• Issue: Here, I expect roles as the name of the field, with an hint to the incorrect index [0]

Example 4

var data = {
    name: 'asd',
    roles: ['admin', 'waste'],
    gender: ['male']
};

This example validates to false with the error:

[1] "1" must be one of [admin, moderator]

• Observation: Here I know, that the field with the name "1" throws the error.
• Issue: Here, I expect roles as the name of the field, with an hint to the incorrect index [1]

Example 5

var data = {
    name: 'test',
    roles: ['admin'],
    gender: ['waste']
};

This example validates to false with the error:

[1] "0" must be one of [male, female]

• Observation: Here I know, that the field with the name "0" throws the error.
• Issue: Here, I expect gender as the name of the field, with an hint to the incorrect index [0]

Issue

The Examples 3, 4 and 5 show, that the index of an incorrect array entry is returned instead of the field name. Based on the field name ("0" and "1"), I do not know which field throws the error. I just know an index.

Note: Actually the problem occured while using react-validation-mixin, where I can get the error message for a given field with this.getValidationMessages('name');. The field name is set to "0", "1", ...