Need to override twice the key name for error messages

[jmgarciaromero]

Context

• node version: 6.11.5
• joi version: 13.0.1
• environment: browser
• used with: webpack 3 and joi-browser 13.0.1

What are you trying to achieve or the steps to reproduce ?

I'm using custom labels for error messages using the following schema

schema = Joi.object().keys({
    a: Joi.boolean(),
    b: Joi.when('a', {
      is: true,
      then: Joi.string().empty('').allow(null),
    }).label('Label b'),
    c: Joi.when('a', {
      is: true,
      then: Joi.string().empty('').allow(null),
    }).label('Label c'),
    d: Joi.when('a', {
      is: true,
      then: Joi.string().empty('').allow(null),
    }).label('Label d'),
  })
  .or('b', 'c', 'd');

schema.validate({a: true, b: 1})

Which result you had ?

"child "Label b" fails because ["b" must be a string]"

What did you expect ?

"child "Label b" fails because ["Label b" must be a string]"

If I want the label to be correct either in the Joi.string() validation or in the .or() validation I need to override twice the key name for each child.

schema = Joi.object().keys({
    a: Joi.boolean(),
    b: Joi.when('a', {
      is: true,
      then: Joi.string().empty('').allow(null).label('Label b'),
    }).label('Label b'),
    c: Joi.when('a', {
      is: true,
      then: Joi.string().empty('').allow(null).label('Label c'),
    }).label('Label c'),
    d: Joi.when('a', {
      is: true,
      then: Joi.string().empty('').allow(null).label('Label d'),
    }).label('Label d'),
  })
  .or('b', 'c', 'd');

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