Extract emoji validation rules to a custom validator

app/finders/award_emojis_finder.rb

@@ -40,7 +40,7 @@ class AwardEmojisFinder
   def validate_name_param
     return unless params[:name]
 
-    raise ArgumentError, 'Invalid name param' unless params[:name].to_s.in?(Gitlab::Emoji.emojis_names)
+    raise ArgumentError, 'Invalid name param' unless TanukiEmoji.find_by_alpha_code(params[:name].to_s)
   end
 
   def validate_awarded_by_param

app/models/award_emoji.rb

@@ -14,7 +14,7 @@ class AwardEmoji < ApplicationRecord
   validates :user, presence: true
   validates :awardable, presence: true, unless: :importing?
 
-  validates :name, presence: true, inclusion: { in: Gitlab::Emoji.emojis_names }
+  validates :name, presence: true, 'gitlab/emoji_name': true
   validates :name, uniqueness: { scope: [:user, :awardable_type, :awardable_id] }, unless: -> { ghost_user? || importing? }
 
   participant :user

app/models/user_status.rb

@@ -22,7 +22,7 @@ class UserStatus < ApplicationRecord
   enum availability: { not_set: 0, busy: 1 }
 
   validates :user, presence: true
-  validates :emoji, inclusion: { in: Gitlab::Emoji.emojis_names }
+  validates :emoji, 'gitlab/emoji_name': true
   validates :message, length: { maximum: 100 }, allow_blank: true
 
   scope :scheduled_for_cleanup, -> { where(arel_table[:clear_status_at].lteq(Time.current)) }

app/validators/gitlab/emoji_name_validator.rb

+# frozen_string_literal: true
+
+# Gitlab::EmojiNameValidator
+#
+# Validates that the provided value matches an indexed emoji alpha code
+#
+# @example Usage
+#    class AwardEmoji < ApplicationRecord
+#      validate :name, 'gitlab/emoji_name':  true
+#    end
+module Gitlab
+  class EmojiNameValidator < ActiveModel::EachValidator
+    def validate_each(record, attribute, value)
+      unless TanukiEmoji.find_by_alpha_code(value.to_s)
+        record.errors.add(attribute, (options[:message] || 'is not a valid emoji name'))
+      end
+    end
+  end
+end

spec/services/users/update_service_spec.rb

@@ -53,7 +53,7 @@ RSpec.describe Users::UpdateService do
       result = update_user(user, status: { emoji: "Moo!" })
 
       expect(result[:status]).to eq(:error)
-      expect(result[:message]).to eq("Emoji is not included in the list")
+      expect(result[:message]).to eq("Emoji is not a valid emoji name")
     end
 
     it 'updates user detail with provided attributes' do