rails validation custom error message is ignored / not shown.. why?

Question

My custom message for scoped uniqueness validation is not displayed.

I'm including what I think is the relevant code, but please let me know if you think there's something else that you might need to see.

class Beverage < ActiveRecord::Base
  has_many :grapeages, dependent: :destroy
  has_many :wine_varietals, through: :grapeages
  validates_associated :grapeages
end

class Grapeage < ActiveRecord::Base
  belongs_to :beverage
  belongs_to :wine_varietal

  # Neither of these seem to work:
  #validates :wine_varietal_id, uniqueness: {scope: :beverage_id, message: 'xxx'}
  validates_uniqueness_of :wine_varietal_id, scope: :beverage_id, message: 'xxx'
end

Rather than 'xxx', the displayed error message is:

Grapeages is invalid

What does 'is not displayed' mean? You don't see it in your view or doesn't appear when you query grapeage.errors? Show us your view if it is present in grapeage.errors — Damien
– Damien, Commented Dec 15, 2011 at 1:51

Community · Accepted Answer · 2017-05-23 10:34:25Z

I found a solution after searching around validates_associated.. my searches led me to 3668018 and I followed up on its first post, which provides a nice fix for the fact that currently validates_associated overrides the actual error messages with [Model] is invalid. As a bonus, the same link shows a nice way to remove duplicate error messages (note that the class had to be updated to ActiveModel::Errors).

# config/initializers/validation_fixes.rb
module ValidatesAssociatedAttributes
  module ActiveRecord::Validations::ClassMethods
    def validates_associated(*associations)
      class_eval do
        validates_each(associations) do |record, associate_name, value|
          (value.respond_to?(:each) ? value : [value]).each do |rec|
            if rec && !rec.valid?
              rec.errors.each do |key, value|
                record.errors.add(key, value)
              end
            end
          end
        end
      end
    end
  end
end

# remove duplicate error messages
class ActiveModel::Errors
  alias old_full_messages full_messages
  def full_messages
    old_full_messages.uniq
  end
end

Don't forget to restart the server.

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