add: validates emoji presence

lib/emoji/validator.rb

@@ -5,6 +5,7 @@
 require 'emoji/validator/version'
 require 'emoji/validator/no_emoji_anywhere_validator'
 require 'emoji/validator/no_emoji_validator'
+require 'emoji/validator/emoji_validator'
 
 module Emoji
   # <tt>ActiveModel</tt> and <tt>ActiveRecord</tt> validators to prevent

lib/emoji/validator/emoji_validator.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+module Emoji
+  module Validator
+    # Validate an attribute against emojis
+    #
+    #   class Person < ApplicationRecord
+    #     validates :first_name, emoji: true
+    #   end
+    #
+    #   person = Person.new(first_name: "😃", last_name: "")
+    #   person.valid? #true
+    #   person.first_name = ""
+    #   person.valid? #false
+    #
+    class EmojiValidator < ActiveModel::EachValidator
+      def validate_each(record, attribute, value)
+        return if value.nil?
+        return if value.match(Unicode::Emoji::REGEX_VALID).present?
+
+        record.errors.add(attribute, :no_emojis)
+      end
+    end
+  end
+end
+
+ActiveModel::Validations::EmojiValidator = Emoji::Validator::EmojiValidator

spec/emoji/emoji_validator_spec.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+class TestEmojiValidator
+  include ActiveModel::Model
+  validates :first_name, emoji: true
+  validates :last_name, emoji: true
+
+  attr_accessor :first_name, :last_name
+end
+
+RSpec.describe Emoji::Validator::EmojiValidator do
+  it 'ignore nil values' do
+    test_object = TestEmojiValidator.new(first_name: '😃', last_name: '😃')
+
+    expect(test_object.valid?).to eq(true)
+  end
+
+  it 'Validates fields that contain no emojis' do
+    test_object = TestEmojiValidator.new(first_name: '',
+                                         last_name: '')
+
+    expect(test_object.valid?).to eq(false)
+    expect(test_object.errors.count).to eq(2)
+    expect(test_object.errors.details[:first_name])
+      .to eq([{ error: :no_emojis }])
+    expect(test_object.errors.details[:last_name])
+      .to eq([{ error: :no_emojis }])
+  end
+end