postgres_enum.rb

module PostgresEnum
  extend ActiveSupport::Concern

  class_methods do
    def postgres_enum_for(column, type_name:)
      enums = ActiveRecord::Base.connection.exec_query <<-SQL
        SELECT pg_enum.enumlabel AS enumlabel
          FROM pg_type
          JOIN pg_enum
            ON pg_enum.enumtypid = pg_type.oid
            WHERE pg_type.typname = '#{type_name}';
      SQL

      hash = {}
      enums.rows.flatten.each { |value| hash[value.to_sym] = value.to_s }

      enum column => hash
    end
  end
end

Use this concern in your model and then call for instance postgres_enum_for :answers, type_name: :answers_type to make answers on your model behave like a enum with the enum value set in postgres db called answers_type.