Module: ActiveFlag::ClassMethods

Defined in:
lib/active_flag.rb

Instance Method Summary collapse

Instance Method Details

#flag(column, keys) ⇒ Object 



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# File 'lib/active_flag.rb', line 11

def flag(column, keys)
  class << self
    attr_reader :active_flags
  end
  @active_flags ||= {}
  @active_flags[column] = Definition.new(column, keys, self)

  # Getter
  define_method column do
    self.class.active_flags[column].to_value(self, read_attribute(column))
  end

  # Setter
  define_method "#{column}=" do |arg|
    write_attribute column, self.class.active_flags[column].to_i(arg)
  end

  # Reference to definition
  define_singleton_method column.to_s.pluralize do
    active_flags[column]
  end

  # Scopes
  define_singleton_method "where_#{column}" do |*args|
    options = args.extract_options!
    integer = active_flags[column].to_i(args)
    column_name = connection.quote_table_name_for_assignment(table_name, column)
    if options[:op] == :and
      where("#{column_name} & #{integer} = #{integer}")
    else
      if integer & (integer - 1) == 0 # Power of 2, single bit
        where("#{column_name} = #{integer}")
      else
        where("#{column_name} & #{integer} > 0")
      end
    end
  end
end