core_ext.rb

class Array
  def to_file(filepath, sep="\n")
    File.open(filepath, 'w') { |f| f.write(join(sep)) } unless blank?
  end

  def squash
    blank? ? [] : flatten.compact.uniq
  end
end

class File
  def self.to_a(filepath, sep="\n")
    open(filepath).to_a(sep) if exists?(filepath)
  end

  def to_a(sep="\n")
    read.each_line.inject([]) do |arr, line|
      arr << line.strip unless line == sep
      arr
    end
  end
end

class String
  def to_boolean
    ActiveRecord::ConnectionAdapters::Column.value_to_boolean(self)
  end
end

class NilClass
  def to_boolean
    false
  end

  def squash
    []
  end
end

class TrueClass
  def to_boolean
    true
  end
end

class FalseClass
  def to_boolean
    false
  end
end