Mongoid unique model references

Question

I'm using Mongoid 3. I have a simple class Tour and references multiple Itineraries. Is there a way that I can validate that for each tour, the itineraries' dates are unique, i.e. I can't have 2 itineraries of the same date for a single tour.

class Tour
  has_many :itineraries
end

class Itinerary
  field :date, :type => Date
  validates :date, :presence => true
  index({date: 1})

  belongs_to :tour
end

I'm not sure how to set up the validation.

Answer 1

You can create custom validations :

class Tour
  has_many :itineraries
  validates :check_uniqueness_of_date # This line

  # And this part
  private 
  def check_uniqueness_of_date
    # Check validation here
  end
end

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