Question

Similarly to how mongoose for nodejs has an enum validator whereby the value of the field must be one of the values in a predefined array, how would a mongoid model in Rails replicate this behavior?

ie.

field :category, type: String --> must be in one of [categoryA, categoryB, categoryC]

Answer 1

You can use this:

validates :category, :inclusion => { :in => ["categoryA", "categoryB", "categoryC"] }