Adding a hook to store emojis in db dynamically.

lib/rumoji/emoji.rb

 # -*- encoding: utf-8 -*-
+
+require 'rumoji/mixin'
+require 'rumoji/extensions'
+
 module Rumoji
   class Emoji
 

lib/rumoji/extensions.rb

+class ApplicationRecord
+  def self.stores_emoji_characters(*attributes)
+    return unless table_exists?
+
+    Rumoji::Mixin.inject_methods(self, attributes)
+  end
+end
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lib/rumoji/mixin.rb

+module Rumoji
+  module Mixin
+    def self.inject_methods(model, attributes)
+      attributes.each do |attribute|
+        model.class_eval <<-RUBY, __FILE__, __LINE__ + 1
+          before_save do
+            unless respond_to?("#{attribute}=")
+              raise ArgumentError.new('#{model} must respond to #{attribute}= in order for Rumoji to store emoji.')
+            end
+
+            self.#{attribute} = Rumoji.encode(self.#{attribute})
+            true
+          end
+
+          def #{attribute}
+            Rumoji.decode(super)
+          end
+        RUBY
+      end
+    end
+  end
+end
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